АЛЬТЕРНАТИВНОЕ РЕШЕНИЕ ДЛЯ НЕОПРЕДЕЛЕННЫХ ОБЛАСТЕЙ В ИЗОБРАЖЕНИЯХ MRCAT

Изобретение относится к области медицины. Система обработки для вычисления альтернативной карты (84) распределения электронной плотности исследуемого объема содержит систему (30) обработки, выполненную с возможностью вычисления первой карты (80) распределения электронной плотности с использованием множества данных визуализации, вычисления второй карты (82) распределения электронной плотности, при этом вторая карта (82) распределения электронной плотности является упрощенной версией первой карты (80) распределения электронной плотности, вычисления альтернативной карты (84) распределения электронной плотности с использованием первой карты (80) распределения электронной плотности и второй карты (82) распределения электронной плотности, при этом система (30) обработки выполнена с возможностью замены в одной или более зонах (90) артефактов первой карты (80) распределения электронной плотности второй картой (82) распределения электронной плотности с получением альтернативной карты (84) распределения ...

СИСТЕМА МАГНИТНО-РЕЗОНАНСНЫХ ИССЛЕДОВАНИЙ, ИМЕЮЩАЯ ПОЛЬЗОВАТЕЛЬСКИЙ ИНТЕРФЕЙС

Изобретение относится к медицине. Система магнитно-резонансных исследований для визуализации тканей пациента, которая снабжена графическим интерфейсом пользователя и модулем (программного обеспечения) анализа. Модуль анализа выполнен с возможностью анализа данных обследования, в частности выбранного протокола обследования, для действий, которые должны быть предприняты оператором, таких как подключение вспомогательного оборудования или радиочастотных приемных катушек в системе магнитно-резонансных исследований. Модуль анализа выдает действия, которые необходимо предпринять, на графический пользовательский интерфейс в надлежащий момент до или во время выполнения протокола обследования. Таким образом, при выполнении выбранного протокола обследования оператор направляется и поддерживается. Это повышает эффективность последовательности операций при выполнении одного или более выбранных протоколов. 4 н. и 4 з.п. ф-лы, 3 ил.

ГРАДИЕНТНАЯ СИСТЕМА ПИТАНИЯ MRI С ДОБАВЛЕННЫМ НАКОПИТЕЛЕМ ЭНЕРГИИ

Изобретение относится к формированию магниторезонансных изображений. Цепь питания содержит систему подачи питания, накопитель энергии и градиентный усилитель для подачи тока в градиентную катушку системы формирования магниторезонансных изображений, при этом система подачи питания содержит источник электропитания для подачи первого напряжения в градиентный усилитель для возбуждения градиентной катушки, причем выход градиентного усилителя соединен с градиентной катушкой; причем накопитель энергии имеет вход, соединенный с источником электропитания, причем накопитель энергии выполнен с возможностью подачи второго напряжения в градиентный усилитель, при этом накопитель энергии параллелен градиентному усилителю и источнику электропитания, причем накопитель энергии содержит преобразователь напряжения, выполненный с возможностью управления вторым напряжением таким образом, чтобы компенсировать по меньшей мере часть изменения в первом напряжении, происходящего в результате возбуждения градиентной ...

ПРЕДСКАЗАНИЕ, ОПРЕДЕЛЕНИЕ КОЛИЧЕСТВЕННЫХ ОЦЕНОК И КЛАССИФИКАЦИЯ КОНТРАСТНОСТИ МАГНИТНО-РЕЗОНАНСНОГО ИЗОБРАЖЕНИЯ, ИСПОЛЬЗУЯ УРАВНЕНИЕ КОЛИЧЕСТВЕННОЙ ОЦЕНКИ СИГНАЛА КОНТРАСТНОСТИ

Использование: для получения магнитно-резонансного изображения. Сущность изобретения заключается в том, что последовательность для получения магнитно-резонансного изображения определяется протоколом получения изображения и значениями параметров для набора параметров протокола получения изображения. Количественная оценка сигнала контрастности вычисляется для последовательности для получения магнитно-резонансного изображения, соответствующей типу контрастности, для которого должна определяться количественная оценка, используя уравнение количественной оценки. Тип контрастности определяется для последовательности для получения магнитно-резонансного изображения, основываясь на вычисленной количественной оценке сигнала контрастности. При одном из подходов вычисление повторяется для множества различных типов контрастности, для которых должна определяться количественная оценка, и определение основано на вычисленных количественных оценках сигнала контрастности. Технический результат: повышение степени ...

МАГНИТНО-РЕЗОНАНСНАЯ ВИЗУАЛИЗАЦИЯ ВДОЛЬ ОСИ УСТРОЙСТВА ДОСТАВКИ ЭНЕРГИИ

... 1. Медицинское устройство (100), содержащее:- модуль (106) магнитно-резонансной визуализации для получения данных магнитного резонанса из ядер субъекта (144), размещенного внутри визуализируемого объема (138);- терапевтическое устройство, содержащее устройство доставки энергии для доставки энергии в целевой объем (146) внутри визуализируемого объема (138), причем терапевтическое устройство выполнено с возможностью вращения вокруг продольной оси терапевтического устройства;- систему (224) позиционирования для вращения терапевтического устройства;- память (162) для хранения исполняемых машиной инструкций (180, 182, 186, 188, 194); и- процессор (156) для управления медицинским устройством (100), при этом исполнение исполняемых машиной инструкций предписывает процессору:- принимать данные размещения, указывающие размещение целевого объема (146);- управлять системой (224) позиционирования для вращения терапевтического устройства вокруг продольной оси;- получить одно или более опорных изображений ...

ГРАДИЕНТНАЯ СИСТЕМА ПИТАНИЯ MRI С ДОБАВЛЕННЫМ НАКОПИТЕЛЕМ ЭНЕРГИИ

... 1. Цепь (301) питания, содержащая систему (311) подачи питания, накопитель энергии и градиентный усилитель (307) для подачи тока в градиентную катушку (303) системы (100) формирования магниторезонансных изображений, при этом система (311) подачи питания содержитисточник (309) электропитания для подачи первого напряжения в градиентный усилитель (307) для возбуждения градиентной катушки, причем выход градиентного усилителя соединен с градиентной катушкой (303);причем накопитель энергии имеет вход, соединенный с источником (309) электропитания, причем накопитель энергии выполнен с возможностью подачи второго напряжения в градиентный усилитель (307), при этом накопитель энергии параллелен градиентному усилителю (307) и источнику (309) электропитания, причем накопитель энергии содержит преобразователь (313) напряжения, выполненный с возможностью управления вторым напряжением таким образом, чтобы компенсировать по меньшей мере часть изменения в первом напряжении, происходящего в результате возбуждения ...

СИЛОВОЙ ПРЕОБРАЗОВАТЕЛЬ ДЛЯ ЭЛЕКТРОПИТАНИЯ ГРАДИЕНТНОЙ КАТУШКИ ДЛЯ МАГНИТНО-РЕЗОНАНСНОЙ ТОМОГРАФИИ (MRI) И СПОСОБ ФУНКЦИОНИРОВАНИЯ СИЛОВОГО ПРЕОБРАЗОВАТЕЛЯ

... 1. Силовой преобразователь для электропитания градиентной катушки (22) системы магнитно-резонансного исследования, содержащийМножество, по существу одинаковых переключающих ячеек (14, 16, 18), причем каждая переключающая ячейка (14, 16, 18) имеет множество переключающих элементов (52), которые обеспечены для переключения между конфигурацией проводящего состояния и конфигурацией, по существу, непроводящего состояния, причем переключающие ячейки (14, 16, 18) обеспечены для переключения по меньшей мере на основной частоте переключения fи в заданных временных зависимостях друг от друга,блок (20) управления импульсами, обеспеченный для управления заданными временными зависимостями переключения переключающих ячеек (14, 16, 18) посредством обеспечения переключающих импульсов переключающим элементам (52) переключающих ячеек (14, 16, 18),при этом блок (20) управления импульсами обеспечен для определения коррекции фазовых сдвигов между переключающими ячейками для заданной временной зависимости переключения ...

Дешевый безопасный дисплей для магнитного резонанса с сенсорным экраном

Использование: для применения в качестве вспомогательного прибора, совместимого с магнитно-резонансной (МР) томографией. Сущность изобретения заключается в том, что безопасный дисплей для магнитного резонанса (МР) с сенсорным экраном включает в себя сенсорный экран и пленку, которая имеет экранирующий от высоких частот слой и экранирующий от низких частот слой. Шина электрически связывает экранирующий от низких частот слой с экранирующим от высоких частот слоем по периметру поверхности пленки и краю пленки. Пленка прилегает к задней поверхности сенсорного экрана. Шина способствует соединению сенсорного экрана и слоев с дисплейным компонентом с целью образования клетки Фарадея вокруг дисплейных компонентов, содержащихся в корпусе дисплея. Технический результат: обеспечение возможности создания дисплея с сенсорным экраном, способного работать в магнитно-резонансной среде, который является более крупным и лучше экранирован для снижения электромагнитных помех. 3 н. и 12 з.п. ф-лы, 8 ил.

УПРАВЛЕНИЕ КАЧЕСТВОМ ИЗОБРАЖЕНИЯ В ДИНАМИЧЕСКОЙ МАГНИТНО-РЕЗОНАНСНОЙ ТОМОГРАФИИ С КОНТРАСТИРОВАНИЕМ

ВЫБОР КАТУШЕК ДЛЯ ПАРАЛЛЕЛЬНОЙ МАГНИТНО-РЕЗОНАНСНОЙ ВИЗУАЛИЗАЦИИ

... 1. Способ выбора набора катушечных элементов из множества физических катушечных элементов (130), содержащихся в комплекте катушек, для выполнения магнитно-резонансного сканирования интересуемой области (128) для визуализации, при этом способ содержит этапы, на которых: ! определяют матрицу чувствительности катушек множества физических катушечных элементов (130) для интересуемой области (128), ! определяют матрицу проекций, причем матрица проекций проецирует матрицу чувствительности множества физических катушечных элементов на набор виртуальных катушечных элементов, ! определяют из матрицы проекций вклад каждого физического катушечного элемента из множества физических катушечных элементов в набор виртуальных катушечных элементов, ! выбирают на основании вклада физические катушечные элементы с наиболее значимым вкладом в качестве набора катушечных элементов. ! 2. Способ по п.1, в котором матрицу проекций определяют факторизацией матрицы чувствительности катушек. ! 3. Способ по п.2, в котором ...

СИСТЕМА МАГНИТНО-РЕЗОНАНСНЫХ ИССЛЕДОВАНИЙ, ИМЕЮЩАЯ ПОЛЬЗОВАТЕЛЬСКИЙ ИНТЕРФЕЙС

СИСТЕМА МАГНИТНО-РЕЗОНАНСНОГО ОБСЛЕДОВАНИЯ С ПРЕДПОЧТИТЕЛЬНЫМИ НАСТРОЙКАМИ НА ОСНОВЕ ДОБЫЧИ ДАННЫХ

... 1. Способ осуществления сканирования для магнитно-резонансной (МР) томографии с использованием МР-сканера (1), причем способ содержит действия, при которых:- принимают протокол МР-томографии через пользовательский интерфейс (18), причем протокол МР-томографии связан с типом МР-сканирования из предварительно заданного набора типов МР-сканирования, причем протокол МР-томографии включает в себя регулируемые параметры МР-сканера (1) для осуществления сканирования для МР-томографии с использованием типа МР-сканирования, применяемого на МР-сканере (1) для осуществления МР-томографии,- осуществляют запрос к базе данных (30) путем предоставления информации сканирования базе данных (30), причем информация сканирования позволяет базе данных (30) анализировать протокол МР-томографии для идентификации типа МР-сканирования протокола МР-томографии и генерации статистической информации (102) по типу МР-сканирования,- принимают (108), в ответ на упомянутое осуществление запроса, от базы данных (30) статистическую ...

Berechnung von Stimulationswerten in der MRT

Verfahren zur Simulation einer elektrischen Stimulation bei einer Untersuchung eines Untersuchungsobjekts, bei der das Untersuchungsobjekt in einer MR-Anlage zur Erstellung eines MR-Bildes mit Verwendung einer Bildgebungssequenz untersucht wird, mit den Schritten:- Bestimmen eines zeitlichen Verlaufs von zumindest einem bei der Bildgebungssequenz verwendeten Magnetfeldgradienten,- Bestimmen einer zeitlichen Ableitung des zeitlichen Verlaufs des zumindest einen Magnetfeldgradienten,- Bestimmen von Änderungszeitpunkten, in denen sich der Wert der zeitlichen Ableitung ändert,- Durchführen der Simulation der elektrischen Stimulation für die Bildgebungssequenz, wobei die Simulation auf die bestimmten Änderungszeitpunkte beschränkt wird.

Verfahren zu einem Einstellen und/oder Anpassen von Messparametern für eine Messsequenz einer Magnetresonanzuntersuchung

Die Erfindung geht aus von einem Verfahren zu einem Einstellen und/oder Anpassen von Messparametern für eine Messsequenz einer Magnetresonanzuntersuchung mit den folgenden Schritten: – manuelle Auswahl eines einzustellenden Messparameters, – Einstellen und/oder Ändern eines Werts des einzustellenden Messparameters, – Bestimmen von zumindest einem abhängigen Messparameter, dessen Wert bei einer Änderung eines Werts des einzustellenden Messparameters eine Änderung unter der Bedingung, dass vorhandene Bilderfassungskriterien beibehalten werden, erfahren würden, – Bestimmen eines Änderungsvorschlags für eine Änderung des Werts des zumindest einen abhängigen Messparameters und – Anzeigen des zumindest einen abhängigen Messparameters und des Änderungsvorschlags für eine Änderung des Werts des zumindest einen abhängigen Messparameters.

Verfahren und Vorrichtung zur Modifikation einer Magnetresonanz-Ansteuerungssequenz

Die Erfindung betrifft ein Verfahren zu einer Modifikation einer Magnetresonanz-Ansteuerungssequenz, bei dem eine Eigenschaft von auszuspielenden Pulsen basierend auf einer Vorgabe eines Parameters der Magnetresonanz-Ansteuerungssequenz besonders effizient ermittelt wird, indem nach der Vorgabe eines ersten Parameters dieser in eine von mehreren für diesen ersten Parameter vordefinierten Kategorien eingeordnet wird, mit der eine Randbedingung verknüpft ist, die bereitgestellt wird und bei der Ermittlung einer Eigenschaft der auszuspielenden Pulse berücksichtigt und eingehalten wird.

Automatische Positionierung einer Schichtebene bei MR-Angiographiemessungen

Verfahren zur automatischen Bestimmung einer Position einer Schichtebene in einem Untersuchungsbereich für eine Magnetresonanz-(MR-)Angiographiemessung, mit den folgenden Schritten: Aufnehmen von MR-Bilddaten des Untersuchungsbereichs mit einer flusssensitiven Übersichtsbildgebungssequenz, automatisches Erstellen eines dreidimensionalen Bilddatensatzes mit Hilfe der aufgenommenen MR-Signale, automatisches Bestimmen von Signalintensitätsprofilen, die durch den dreidimensionalen Bilddatensatz verlaufen, Bestimmen der Lage eines Blutgefäßes aus den Signalintensitätsprofilen, wobei die Lage des Blutgefäßes im dreidimensionalen Datensatz bestimmt wird durch jeweils ein Bestimmen eines Intensitätsmaximums in den Signalintensitätsprofilen, die durch den dreidimensionalen Bilddatensatz verlaufen, und durch Verbinden der jeweiligen Intensitätsmaxima, und automatisches Bestimmen der Position der Schichtebene für die MR-Angiographiemessung anhand der Lage des Blutgefäßes.

Patienten-Bore mit integrierter HF-Rückflussraumformung zur Minimierung der Kopplung zwischen einer Energiekette und lokalen HF-Sendespulen

Magnetresonanztomographiegerät (101),wobei die Ummantelung (UM) seines (101) Patienten-Bore (103) eine leitfähige Schicht (LS) aufweist,dadurch gekennzeichnet,dass die leitfähige Schicht (LS) an mehreren Punkten mit einem Systemmassepunkt (OVC) des Magnetresonanztomographiegeräts (101) elektrisch leitend verbunden ist unddie leitfähige Schicht (LS)im Bereich einer Hochfrequenz-Sende- und Empfangsleitungen (HFL1, HFL2, HFL3) umfassenden Energiekette (EGK) des Patienten-Bore (103, UM) des Magnetresonanztomographiegeräts (101) angeordnet ist, wobei der Abstand der Energiekette (EGK) zu der Massefläche gering ist.

Gewichtungsmatrix zur Reduzierung von Artefakten bei paralleler Bildgebung

Die Erfindung betrifft ein Verfahren zur Erzeugung einer Gewichtungsmatrix, die bei der Erstellung von MR-Bildern eines Aufnahmevolumens einer Untersuchungsobjekts mit paralleler Bildgebung in einer MR-Anlage mit mehreren Empfangskanälen verwendet wird, mit den folgenden Schritten:- Bestimmen eines Referenzdatensatzes des Untersuchungsobjekts, bei dem zumindest ein Teilabschnitt des zugehörigen Rohdatenraums vollständig mit Rohdaten gefüllt ist,- Bestimmen eines ersten Teilbereichs im Aufnahmevolumen, in dem zumindest eine Komponente der MR-Anlage eine geringere Homogenität aufweist als in einem zweiten Teilbereich des Aufnahmevolumens,- Bestimmen von zumindest einem ersten Empfangskanal unter den mehreren Empfangskanälen, der in dem ersten Teilbereich des Aufnahmevolumens eine höhere Signalintensität liefert als andere Empfangskanäle der mehreren Empfangskanäle,- Berechnen der Gewichtungsmatrix, mit der bei der parallelen Bildgebung nicht aufgenommene Rohdatenpunkte anhand des Referenzdatensatzes ...

Verfahren, Magnetresonanzanlage und elektronisch lesbarer Datenträger zur Narbenquantifizierung im Myokard

Die Erfindung betrifft ein Verfahren zur Bestimmung eines Anteils eines Narbengewebes in einem Myokard einer Untersuchungsperson. Das Verfahren umfasst die folgenden Schritte: Präparieren einer Magnetisierung durch Einstrahlen von zumindest einem Präparationspuls in einem Untersuchungsabschnitt, der das Myokard umfasst; Aufnehmen von MR-Signalen aus dem Untersuchungsabschnitt zur Erzeugung von mehreren MR-Bildern des Untersuchungsabschnitts während die Magnetisierung sich einem Gleichgewichtszustand nähert, des Registrierens der mehreren MR-Bilder relativ zu einander, so dass eine Bewegung des Herzens zwischen mehreren MR-Bildern kompensiert wird, und sich eine Abfolge von kompensierten MR-Bildern ergibt; Bestimmen von T1-Zeiten mit Verwendung der Abfolge der kompensierten MR-Bilder in dem Untersuchungsabschnitt, Berechnen von verschiedenen MR-Vorlagebildern des Untersuchungsabschnitts zu verschiedenen Zeitpunkten nach dem Einstrahlen des zumindest einen Präparationspulses unter Verwendung ...

SAR-Anpassung von Messparametern gemäß Präferenzen

Die Erfindung betrifft ein Verfahren zur Vermeidung einer Überschreitung einer zulässigen spezifischen Absorptionsrate während einer Magnetresonanzuntersuchung, eine Auswerteeinheit, eine Magnetresonanzvorrichtung und ein Computerprogrammprodukt. Das Verfahren umfasst folgende Schritte: Eine erste Bereitstellungseinheit stellt eine zulässige SAR an eine Auswerteeinheit bereit. Eine zweite Bereitstellungseinheit, die identisch mit der ersten Bereitstellungseinheit sein kann, stellt ein Messprotokoll der Magnetresonanzuntersuchung an die Auswerteeinheit bereit. Durch die Auswerteeinheit wird des Messprotokolls auf die zulässige SAR überprüft. Ergibt diese Überprüfung, dass die zulässige SAR nicht eingehalten wird, erfolgt eine Modifikation des Messprotokolls. Dabei umfasst die Modifikation des Messprotokolls eine Änderung mindestens eines Messparameters des Messprotokolls. Die Änderung des mindestens einen Messparameters erfolgt dabei abhängig von mindestens einem Präferenzparameter.

Verfahren und Einrichtung zur Ermittlung einer Magnetresonanzsystem-Ansteuersequenz und Verfahren zum Betrieb eines Magnetresonanzsystems

Verfahren zur Ermittlung einer Magnetresonanzsystem-Ansteuersequenz (AS), welche einen Mehrkanal-Pulszug (MP) mit mehreren individuellen, vom Magnetresonanzsystem (1) über verschiedene unabhängige Hochfrequenz-Sendekanäle (S1, ..., SN) einer Sendeeinrichtung (5, 6, 12, 13) parallel auszusendenden HF-Pulszügen umfasst, wobei auf Basis einer k-Raum-Gradiententrajektorie (GT) und einer vorgegebenen Ziel-Magnetisierung (ZM) in einem HF-Puls-Optimierungsverfahren ein Mehrkanal-Pulszug (MP) berechnet wird, dadurch gekennzeichnet, dass im HF-Puls-Optimierungsverfahren eine Optimierung des Mehrkanal-Pulszugs (MP) und/oder der k-Raum-Gradiententrajektorie (GT) hinsichtlich einer Krümmung der Spannungskurve (SK1, SK2) eines HF-Pulszugs und/oder hinsichtlich der Bandbreite der Fouriertransformierten eines HF-Pulszugs unter Berücksichtigung zumindest eines Hardware-Betriebsparameters (HWL) der Sendeeinrichtung (5, 6, 12, 13) erfolgt.

Verbesserte Systemjustierung bei einer MR-Anlage

Verfahren zur Durchführung von Justierungsmessungen in einer MR-Anlage, für die Erstellung eines MR-Bildes eines Untersuchungsobjekts (12), wobei die MR-Anlage eine Recheneinheit (20) zum Bedienen der MR-Anlage durch einen Benutzer und eine Systemsteuereinheit (30), die ausgebildet ist, mehrere Systemkomponenten der MR-Anlage zu steuern, aufweist, mit den folgenden Schritten: – Durchführen eines Vorbereitungsschrittes auf der Recheneinheit zur Vorbereitung eines ersten Justierungsschrittes, bei dem durch die Systemsteuereinheit ein erster Parameter einer Systemkomponente an das Untersuchungsobjekt (12) angepasst wird, und zur Vorbereitung eines zweiten Justierungsschrittes, bei dem durch die Systemsteuereinheit ein zweiter Parameter einer Systemkomponente an das Untersuchungsobjekt (12) angepasst wird, wobei der Vorbereitungsschritt auf der Recheneinheit zumindest einen der folgenden Schritte aufweist: – ein Laden von einer ersten Programmdatei, die ausführbare Befehle enthält, in einen ...

Untersuchungsobjekt-spezifisches Erfassen von Magnetresonanz-Bilddaten mittels einer Magnetresonanz-Sequenz, welche zumindest einen adiabatischen Hochfrequenz-Puls umfasst

Die Erfindung betrifft ein Verfahren zum Erfassen von Magnetresonanz-Bilddaten eines Untersuchungsobjekts mittels einer Magnetresonanz-Sequenz, welche zumindest einen adiabatischen Hochfrequenz-Puls umfasst, ein Magnetresonanzgerät und ein Computerprogrammprodukt. Um ein besonders vorteilhaft auf das Untersuchungsobjekt abgestimmtes Verfahren zum Erfassen von Magnetresonanz-Bilddaten anzugeben, wird vorgeschlagen, dass das erfindungsgemäße Verfahren zum Erfassen von Magnetresonanz-Bilddaten eines Untersuchungsobjekts mittels einer Magnetresonanz-Sequenz, welche zumindest einen adiabatischen Hochfrequenz-Puls umfasst, die folgenden Verfahrensschritte umfasst: – Erfassen von zumindest einem Untersuchungsobjekt-Parameter, welcher spezifisch für das Untersuchungsobjekt ist, – Einstellen von zumindest einem Puls-Parameter des zumindest einen adiabatischen Hochfrequenz-Pulses unter Verwendung des zumindest einen Untersuchungsobjekt-Parameters und – Erfassen von Magnetresonanz-Bilddaten des Untersuchungsobjekts ...

Verfahren zur Konfiguration einer Bildgebungsvorrichtung

Eine Datenbank enthält Varianten von Protokollen für den Betrieb von Magnetresonanztomographen sowie unterschiedliche Typen von Magnetresonanztomographen. Jede Variante enthält Parameterwerte und ist einem der Typen zugeordnet. In einer Trainingsphase werden Relationen zwischen den Parametern untereinander und/oder zwischen den Parametern und den zugehörigen Typen ermittelt und als Muster in einer Wissensbasis abspeichert. Später wird in einer Anwendungsphase anhand der ermittelten Muster ein Protokollentwurf für den Betrieb eines neuen Magnetresonanztomographen erstellt. Das Verfahren bietet den Vorteil, dass die Effizienz und Qualität der automatischen Konvertierung der Protokolle verbessert wird. Die verbesserte Qualität des Protokollentwurfs reduziert Arbeitszeit und Kosten für eine manuelle Nachbearbeitung der Protokolle. Weiterhin wird eine höhere Konsistenz der Protokolle untereinander sowohl zwischen Produktfamilien als auch zwischen einzelnen Konfigurationen erreicht.

Object e.g. patient, investigation planning method for magnetic resonance system, involves determining position of image and another image in object, where position of latter image and parameter are determined before recoding former image

The method involves determining a position of an image, which is recorded in a table position, in an investigation object, and a measuring parameter for the image. The position of another image, which is recorded in another table position, in the object is determined. Another measuring parameter is determined for the latter image. The position of the latter image and latter parameter are determined before recoding the former image.

MAGNET RESONANCE ILLUSTRATION RECEIPT CHAIN WITH DYNAMIC REINFORCEMENT AND WIRELESS RECEIVING COIL

Nuclear magnetic resonance T2 recovery pulse

Various embodiments include apparatus and methods to conduct measurements on a structure using a nuclear magnetic resonance tool. The nuclear magnetic resonance tool can be operated to make nuclear magnetic resonance measurements that generate transverse 5 relaxation time echo train sequences ending with a recovery pulse. Additional apparatus, systems, and methods are disclosed.

Method of extracting information about a sample by nuclear magnetic resonance measurements

According to an aspect of the present inventive concept, there is provided a method of extracting information about a sample, the method comprising: performing a plurality of magnetic resonance measurements on the sample, each measurement including subjecting the sample to an encoding sequence, at least a part of the sequence being adapted to encode a magnetic resonance signal attenuation due to nuclear relaxation and diffusion, wherein at least one parameter of a gradient pulse sequence is varied between at least a subset of said plurality of measurements,and at least one measurement of said subset includes a gradient pulse sequence having a diffusion-encoding tensor representation with more than one non-zero eigenvalue, and wherein at least a subset of said plurality of measurements include encoding for different levels of magnetic resonance signal attenuation due to nuclear relaxation; and extracting information about the sample from signals resulting from said plurality of magnetic ...

CORRECTING FOR HYSTERESIS IN MAGNETIC RESONANCE IMAGING

An apparatus for controlling at least one gradient coil of a magnetic resonance imaging (MRI) system. The apparatus may include at least one computer hardware processor; and at least one computer-readable storage medium storing processor executable instructions that, when executed by the at least one computer hardware processor, cause the at least one computer hardware processor to perform a method. The method may include receiving information specifying at least one target pulse sequence; determining a corrected pulse sequence to control the at least one gradient coil based on the at least one target pulse sequence and a hysteresis model of induced magnetization in the MRI system caused by operation of the at least one gradient coil; and controlling, using the corrected gradient pulse sequence, the at least one gradient coil to generate one or more gradient pulses for imaging a patient.

BATTERY OPERATED RELAY TEST DEVICE 2

The aim of the invention is to improve the efficiency and handling of a test device (4) for testing a protection relay (2). This is achieved by a method and a test device (4). A signal (S) is generated in a test device (4), and the signal (S) is applied to the protection relay (2). An adaptation device (X) which can be found in the test device (4) is supplied with a supply voltage (Uv) by an accumulator (5), and the adaptation device (X) supplies a signal generator (G) with an intermediate voltage (Ux), said signal generator generating the signal (S). The use of an accumulator (4) allows fuel-supplied power units to be obviated. The use of an adaptation device (X) allows the supply voltage (Ux) of the accumulator (5) to be converted into small intermediate voltages (Ux) and the small currents of the accumulator (5) to be converted into high currents in order to supply the signal generator (G) for example.

A METHOD OF PERFORMING DIFFUSION WEIGHTED MAGNETIC RESONANCE MEASUREMENTS ON A SAMPLE

According to an aspect of the present inventive concept there is provideda method of performing diffusion weighted magnetic resonance measurements on a sample, the methodcomprising: performing a plurality of diffusion weighted magnetic resonance measurements on the sample, wherein said plurality of measurements includes: a first measurement with a first diffusion encoding sequence having a tensor representation with three non-zero eigenvalues, a second measurement with a second diffusion encoding sequence,and a third measurement with a third diffusion encoding sequence, wherein the second and the third diffusion encoding sequence have different spectral content. Figure for publication: Fig.

METHOD, SYSTEM AND APPARATUS FOR IMAGE CAPTURE AND REGISTRATION IN IMAGE-GUIDED SURGERY

A method, system and apparatus for image capture and registration are described. The method includes: obtaining a position of an imaging device in a tracking system frame of reference; obtaining a position of a patient in the tracking system frame of reference; determining, based on the position of the imaging device and the position of the patient, a transformation for registering an imaging device frame of reference with a patient frame of reference; receiving an instruction to capture an image, the instruction including coordinates identifying a target area in the patient frame of reference; applying the transformation to convert the coordinates to the imaging device frame of reference; and controlling the imaging device to capture an image based on the converted coordinates.

With reduced acoustic noise emission of the arterial spin labeling and method of operation thereof

Magnetic resonance imaging device and method for magnetic resonance imaging

SIMULATION INSTALLATION AND FOR PREPARING A PATIENT HAS AN MRI EXAMINATION, ESPECIALLY FOR CHILDREN, AND SIMULATION METHOD AND PREPARATION THEREOF

MAGNETIC RESONANCE IMAGING SYSTEM

Disclosed is a magnetic resonance imaging system. The disclosed magnetic resonance imaging system includes a system control unit capable of independently acquiring a magnetic resonance image signal for elements which are different from each other and exist in an object to be inspected. The system control unit includes a first system control unit which can acquire a magnetic resonance signal of a first element and a second system control unit which can acquire a magnetic resonance signal of a second element which is different from the first element. The first system control unit and the second system control unit are physically independently configured. The first system control unit and the second system control unit independently control a first RF coil element and a second RF coil element of each RF coil. Accordingly, the present invention can simultaneously acquire the magnetic resonance signals of various kinds of elements which exist in the object to be inspected. COPYRIGHT KIPO 2017 ...

OPERATION OF MEDICAL IMAGING EXAMINATION DEVICE COMPRISING MULTIPLE SUBSYSTEMS

Operation of a medical imaging examination device comprising multiple subsystems. Described is a method for operating of a medical imaging examination device comprising multiple subsystems and a control device controlling subsystems in an adjusted way to perform scan sequences. The method comprises the steps of: transmitting a control protocol assigned to a scan to be performed to a control device; determining sequence control data relevant to the control protocol which defines different functional subsequences of a scan sequence contained in the control protocol; assigning different effective volumes to functional subsequences respectively; determining current ambient conditions of the medical imaging examination device which are critical to determined relevant sequence control data and relevant effective volumes; calculating and storing control signals for scan sequences on the basis of the determined sequence control data, effective volumes and determined current ambient conditions, ...

MAGNETIC RESONANCE IMAGING DEVICE AND METHOD FOR COMPUTING SPECIFIC ABSORPTION RATIO THEREOF

A magnetic resonance imaging device (10) comprises: a shift RF power computation means for, when the weight of a subject or of an image capture site within the subject is less than or equal to a threshold value, shifting RF power and computing shift RF power according to the difference between the weight and the threshold; a specific absorption ratio computation means for, if the weight is less than or equal to the threshold value, computing the specific absorption ratio on the basis of the threshold and the shift RF power; and a display means for displaying the specific absorption ratio in a display device.

MULTI-SHOT SCAN PROTOCOLS FOR HIGH-RESOLUTION MRI INCORPORATING MULTIPLEXED SENSITIVITY-ENCODING (MUSE)

Multi-shot DWI with multiplexed sensitivity-encoding (MUSE) inherently corrects nonlinear shot-to-shot phase variations without requiring the use of navigator echoes. The multi-shot DWI can use interleaved echo-planar imaging or other scan protocols. This new technique should prove highly valuable for mapping brain structures and connectivities at high spatial resolution for neuroscience studies.

MOTION-DEPENDENT DATA ACQUISITION IN MAGNETIC RESONANCE IMAGING AND SPECTROSCOPY

The invention relates to a magnetic resonance (MR) system for acquiring MR data from a subject (105), the MR system comprising a monitoring module (117) for monitoring a characteristic of a motion of the subject, the characteristic of the motion having a pre-determined or dynamically adjusted limit (119), and a pulse sequencer (108) for applying a pulse sequence to acquire data from the subject (105) when the characteristic of the motion is within the limit (119), the pulse sequence comprising at least one pulse waveform, wherein the pulse sequencer (108) is further arranged to regulate a characteristic of the at least one pulse waveform when the characteristic of the motion surpasses the limit (119).

METHOD AND APPARATUS FOR VERIFYING A PULSE SEQUENCE OF MAGNETIC RESONANCE IMAGING APPARATUS

A pulse verifying apparatus including a user input unit, which obtains a set value of a parameter for determining a magnetic resonance imaging (MRI) pulse sequence; a control unit, which compares the set value of the parameter to a critical value of the parameter and, based on a result of the comparison, determines whether an error occurred with respect to the parameter; and a display unit, which, if an error occurred with respect to the parameter, displays information regarding the error on a pulse sequence diagram corresponding to a MRI pulse sequence generated based on the set value of the parameter.

Magnetic resonance imaging apparatus and magnetic resonance imaging method

A magnetic resonance imaging apparatus according to an embodiment includes a collecting unit and an identifying unit. The collecting unit collects at least one frequency spectrum out of a plurality of frequency spectra by performing a pre-scan in which a first substance is frequency-selectively suppressed or enhanced. The identifying unit analyzes the frequency spectra and identifies a resonance frequency of a second substance on the basis of analysis results.

AUTOMATIC PROTOCOLLING TO REDUCE SYSTEM AND PATIENT INTERACTIONS

An automatic protocolling system and methods involving a processor operable by way of a set of executable instructions storable in relation to a nontransient memory device, the set of executable instructions configuring the processor to: receive information relating to an initial protocol comprising an initial ordering of a plurality of sequences, the information comprising data relating to an interaction extent value of at least one of an imaging system and a patient as a function of time corresponding to each sequence in the plurality of sequences, the data relating to a time-integrated effect of each sequence in the plurality of sequences; and dynamically determine an alternative protocol comprising an alternative ordering of the plurality of sequences based on the time-integrated effect, whereby an alternative protocol is provided.

MAGNETIC RESONANCE IMAGING APPARATUS, MAGNETIC RESONANCE IMAGING METHOD, AND COMPUTER PROGRAM PRODUCT

A magnetic resonance imaging apparatus according to an embodiment includes sequence control circuitry and processing circuitry. The sequence control circuitry performs multi-frame acquisition where FOVs (Field Of Views) of at least two acquired frames are overlapped in a first direction. Then, based on the multi-frame acquisition performed by the sequence control unit, the processing unit generates data regarding the components in the first direction of flow of a fluid.

Method for the operation of a magnetic resonance apparatus

In a method for operating a magnetic resonance apparatus, having a radio frequency system for transmitting radio frequency excitation pulses and/or for receiving magnetic resonance signals and a gradient system for generating temporally variable, magnetic gradient fields the excitation pulses and gradient fields are activated dependent on time-variant signals. The time-variant signals are made available in the form of discrete signal values. Each discrete signal value of at least one signal is generated by a virtual machine by processing a virtual machine program.

MAGNETIC RESONANCE IMAGING APPARATUS

A magnetic resonance imaging (MRI) apparatus includes a housing which has a bore to which a magnetic field for use in an MRI scan is applied, a moving table on which an inspection target may be placed and that enters the bore of the housing, a projector which projects an image onto an inner wall that forms the bore of the housing, and a controller which controls the projection unit and transmits a video signal to the projector.

MRI apparatus and RF transmit gain setting method

An MRI apparatus which obtains a tomogram of an object by utilizing magnetic resonance includes a calibrating device which figures out a relationship between a center frequency and an optimal gain of RF transmission with respect to a predetermined range of central frequencies, a saving device which saves information expressing said relationship, and a setting device which sets the RF transmission gain according to the center frequency during subsequent scanning by utilizing the saved information.

Magnetic resonance apparatus and method to acquire and display calibration images

In a method and magnetic resonance apparatus to acquire and present calibration images of a periodically moving organ with the use of magnetic resonance technology, calibration images are acquired by acquiring measurement data for multiple calibration images during one continuous period of the organ movement, the multiple calibration images differing in their offset frequency and/or in their spatial position in the organ to be examined, and the calibration images in a presentation manner that, from the visual quality of the respective images, allows the user to select (identify) the image acquired with the offset frequency that should then be used to acquire the diagnostic image are displayed to a user.

METHOD, DEVICE AND MAGNETIC RESONANCE APPARATUS FOR TEMPERATURE REGULATION OF A MAGNETIZABLE ENVIRONMENT OF A GRADIENT COIL

In a method and device for regulating the temperature of the at least partly magnetizable environment of a gradient coil arrangement of a magnetic resonance apparatus, a computer is provided with a first item of information, representing a time-dependent power output of the gradient coil arrangement, and the computer ascertains a prospective temperature of the at least partly magnetizable environment from the first item of information. The computer determines a compensating temperature for a temperature regulating medium based on the ascertained prospective temperature, so that the temperature regulating medium with the compensating temperature produces a temperature in the at least partly magnetizable environment that is stable over time while the time-dependent power output is occurring. The temperature of the at least partly magnetizable environment of the gradient coil arrangement is thereby regulated by producing the compensating temperature in the temperature regulating medium.

Apparatus and method for remotely controlling in real time measurement parameters of a magnetic resonance (MR) scanner

Apparatus for remotely controlling parameters of an image scanning apparatus includes a software interface for translating commands from an external application for providing scanner control commands to a scanner control machine for control of the parameters; and the software interface includes syntax software for translating the commands from the external application into a given syntax for providing the scanner control commands.

Magnetic resonance imaging apparatus and RF pulse for navigator and imaging sequence applying method

A magnetic resonance imaging apparatus includes a scan section for executing a navigator sequence which transmits an RF pulse to a subject to obtain each magnetic resonance signal as navigator data. Upon execution of the navigator sequence, the scan section excites both a navigator area having two regions from which intensities of different navigator data signals are obtained, the two regions containing a body-moved region of the subject, and a region different from the two regions simultaneously, and transmits the RF pulse in such a manner that the phase of navigator data obtained from the different region differs from the phase of at least one region of navigator data obtained from the two regions.

METHOD AND SYSTEM FOR CARDIAC SCAN PLANE PRESCRIPTION

The present application discloses a method of prescribing a scan plane during Magnetic Resonance Imaging (MRI) of an anatomy. The method comprises acquiring a volume image of the anatomy at a first resolution and simultaneously displaying three planar images representing cross-sections through the anatomy. The three images are orthogonal to each other and intersecting at a common point in the volume. The method also comprises further displaying a pair of axes on each image showing a correspondence of the image with each of the other two images, and receiving a manipulation of one at least one of the axes on at least one of the images and automatically updating the other images to maintain the correspondences. The method also comprises acquiring a volume of the anatomy at a second resolution that is higher than the first resolution.

Cloud-based MR imaging

A magnetic resonance (MR) imaging system has an infrastructure within a cloud, designed to generate and/or activate and/or deactivate and/or terminate virtual systems on demand, which generate and operate multiple MR workflows as instances. The virtual systems has a cloud-based virtual MR host with an active MR workflow connected on demand to an MR control computer that operates an MR scanner to control an imaging process on the basis of one of the workflows. A client unit transmits patient-specific data to the virtual MR host and evaluates image data received from the virtual MR host.

Navigator-less segmented diffusion weighted imaging enabled by multiplexed sensitivity-encoded imaging with inherent phase correction

Diffusion weighted imaging (DWI) and diffusion tensor imaging (DTI) using a new technique, termed multiplexed sensitivity encoding with inherent phase correction, is proposed and implemented to effectively and reliably provide high-resolution segmented DWI and DTI, where shot-to-shot phase variations are inherently corrected, with high quality and SNR yet without relying on reference and navigator echoes. The performance and consistency of the new technique in enabling high-quality DWI and DTI are confirmed experimentally in healthy adult volunteers on 3 Tesla MRI systems. This newly developed technique should be broadly applicable in neuroscience investigations of brain structure and function.

MRI APPARATUS AND RF AMPLIFICATION CIRCUIT

According to one embodiment, an MRI apparatus includes an amplifier and a control circuit. The amplifier amplifies an RF pulse and supplies it to an RF coil. The control circuit is configured to determine whether an output RF pulse outputted from the amplifier is fed back to an input side of the amplifier to correct an input RF pulse to be inputted into the amplifier, based on a determination value being set according to a slew rate of the input RF pulse. 1. An MRI apparatus comprising:an amplifier amplifying an RF pulse and supplying the amplified RF pulse to an RF coil; anda control circuit configured to determine whether an output RF pulse outputted from the amplifier is fed back to an input side of the amplifier to correct an input RF pulse to be inputted into the amplifier, based on a determination value being set according to a slew rate of the input RF pulse.2. The MRI apparatus according to claim 1 ,wherein the control circuit is configured to perform determination in such a manner that the input RF pulse is corrected when the slew rate is smaller than a threshold value, and to perform the determination in such a manner that the input RF pulse is not corrected when the slew rate is equal to or larger than the threshold value.3. The MRI apparatus according to claim 2 , further comprising a sequence controller configured to determine a condition of an RF pulse supplied to the amplifier claim 2 ,wherein the control circuit is configured to determine whether to correct the input RF pulse by acquiring information on the slew rate from the sequence controller.4. The MRI apparatus according to claim 2 , further comprising a calculation circuit configured to detect the input RF pulse and calculate the slew rate.5. The MRI apparatus according to claim 4 ,wherein the calculation circuit and the control circuit are provided separately from an RF amplification circuit that includes the amplifier.6. The MRI apparatus according to claim 5 ,wherein the calculation circuit ...

Active b1+ shimming of transmission coils

The invention provides for a magnetic resonance imaging system (100) comprising a radio frequency system (116, 114, 118) configured for acquiring magnetic resonance data (144) from an imaging zone (108). The radio frequency system is configured for sending and receiving radio frequency signals to acquire the magnetic resonance data, wherein the radio frequency system comprises: an elliptical transmission coil (114) configured for generating a B1+ excitation field within the imaging zone; and an active B1 shim coil (118) configured for being placed within the imaging zone, wherein the radio frequency system is configured for suppling radio frequency power to the active B1 shim coil during the generation of the B1+ excitation field by the elliptical transmission coil, wherein the B1 shim coil is configured for shimming the B1+ excitation field within the imaging zone.

MAGNETIC RESONANCE IMAGING APPARATUS

According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry collects magnetic resonance data in accordance with a pulse sequence. The processing circuitry determines image quality based on the magnetic resonance data. The processing circuitry selects a re-collection pulse sequence when it is determined that the image quality does not satisfy criteria, the re-collection pulse sequence having at least one of a type of sequence or an imaging condition differing from that of the pulse sequence.

MR imaging with signal suppression of a spin series

In a magnetic resonance measurement sequence, an inversion pulse is applied that acts on a longitudinal magnetization of a first spin species and a second spin species, for example on a water portion and a fat portion. An excitation pulse is applied after a predetermined time period. At least one manipulation pulse is subsequently applied, respectively with associated gradient pulse.

ATTACHING PERIPHERAL COMPONENTS OF A MEDICAL IMAGING SYSTEM

One or more peripheral components are attached to a medical imaging system. One or more devices are attached to the one or more peripheral components and configured to communicate data with a controller of the medical imaging system.

Scan condition determining apparatus and method for a magnetic resonance imaging system

There is provided a scan condition determining apparatus for a magnetic resonance imaging system comprising accepting means for accepting specification of a desired scan time; and searching means for searching for a second scan condition based on a first scan condition defined before the specification, by adjusting values of parameters affecting a scan time or a signal-to-noise ratio of signals obtained by a scan, said second scan condition being one with which the scan time approximates within an allowable range or matches the desired scan time, and besides, a lowest value of a relative signal-to-noise ratio of the signals approximates within an allowable range or matches a lowest value of the relative signal-to-noise ratio of the signals estimated based on the first scan condition. The parameters include, for example, any one of a number of times of addition, a y-axis direction resolution, a repetition time, and a number of data acquisition passes.

MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD

In one embodiment, an MRI apparatus (10) includes a gap calculating unit (65), a candidate calculating unit (66) and a sequence setting unit (61). The gap calculating unit calculates a gap between the center frequency of an RF pulse and a resonance center frequency, after start of a pulse sequence. The candidate calculating unit calculates a plurality of candidate timings so as to avoid influence of a CF scan for measuring the resonance center frequency on MR signals, when the CF scan is inserted in the pulse sequence. The sequence setting unit sets the pulse sequence so that CF scans are inserted in the pulse sequence at the timings according to the gap and the candidate timings. Each time the CF scan is executed, the center frequency of an RF pulse is updated and the pulse sequence is continued. Thereby, the MR signals are acquired.

MAGNETIC RESONANCE IMAGING APPARATUS AND CONTROL METHOD OF MAGNETIC RESONANCE IMAGING APPARATUS

According to a Magnetic Resonance Imaging (MRI) apparatus, each of buttons provided in a plurality of sections included in a receiving coil receives from an operator a selecting operation of selecting a section in which the button itself is provided. A control unit of a computer system moves a table on which a subject is placed such that the center of the section selected by receiving the selecting operation via the button is positioned at the center of a magnetic field.

SYNTHETIC MAGNETIC RESONANCE IMAGING AND MAGNETIC RESONANCE FINGERPRINTING WITH A CONTRAST AGENT, AND DETERMINATION OF A CONTRAST AGENT INJECTION PROTOCOL

A method and system determine, with a computer system including one or more processors, a plurality of parameters associated with a volume in an object over time in a series of sequence blocks. In a sequence block in the series of sequence blocks, the plurality of parameters are determined as occurring simultaneously in the volume in the object. At least one parameter of the plurality of parameters varies from the sequence block to another sequence block in the series of sequence blocks, and the plurality of parameters include a contrast related parameter associated with a concentration of a contrast agent in the volume in the object over time in the series of sequence blocks. The computer system generates a signal evolution based on the plurality of parameters of the volume in the object over time in the series of sequence blocks, the signal evolution defining the contrast related parameter over time in the series of sequence blocks.

Method and apparatus for optimizing a magnetic resonance control sequence

In magnetic resonance tomography apparatus and operating a method, a magnetic resonance control sequence with a dynamic magnetic field gradient is optimized in computer, based on an image basis and a gradient basis. A basis transformation of the dynamic magnetic field gradient from the image basis into the gradient basis is implemented, and the dynamic magnetic field gradient in the gradient basis is optimized and is emitted from the computer in an optimized magnetic resonance control sequence.

EMULATION MODE FOR MRI

The invention relates to a magnetic resonance imaging system (100). The magnetic resonance imaging system (100) is configured to be selectively operated in a default mode and an emulation mode. Execution of machine executable instructions (290) by a processor (203) of the magnetic resonance imaging system (100) causes the magnetic resonance imaging system (100) to receive a selection signal selecting the emulation mode. The magnetic resonance imaging system (100) switches from the default mode to the emulation mode. The magnetic resonance imaging system (100) is operated in the emulation mode using the set of emulation control parameters (292). The emulated magnetic resonance imaging data (270) is acquired from the imaging zone (108) of the magnetic resonance imaging system (100).

MAGNETIC RESONANCE APPARATUS AND METHOD FOR ACQUIRING MEASUREMENT DATA DURING SIMULTANEOUS MANIPULATION OF SPATIALLY SEPARATE SUB-VOLUMES

In a magnetic resonance method and apparatus, a control computer for a data acquisition scanner automatically determines sequence control data, for a control protocol that has been loaded into the control computer, that define different functional sub-sequences of data acquisition sequence, the sub-sequences causing nuclear spins in at least two sub-volumes of a subject to be simultaneously manipulated or used in order to acquire magnetic resonance data. For each sub-sequence, the computer determines a respective effective volume dependent on the respectively associated sub-volumes, and determines applicable underlying conditions from which control signals are generated that locally optimize the sub-sequences for each effective volume.

METHOD FOR GENERATING A MAGNETIC RESONANCE IMAGE DATASET, COMPUTER PROGRAM PRODUCT, DATA MEDIUM, AND MAGNETIC RESONANCE SYSTEM

A method is provided for generating a magnetic resonance image dataset containing spectroscopic information from an in vivo measurement. The method includes acquiring measurement data by a non-Cartesian k-space sampling scheme, performing a gradient correction of the measurement data, regridding the measurement data to Cartesian coordinates, Fourier-transforming the measurement data, determining the fat component and/or the fatty acid components of at least some of the volume elements using a model function applied to the signal distribution, and generating at least one magnetic resonance image dataset in which one piece of the spectroscopic information is mapped in a spatially resolved manner. A computer program product, a data medium, and a magnetic resonance system are also disclosed.

Acceleration of stationary alignment measurements

The embodiments relate to a method for the optimization of alignment measurements in which a MR facility is configured to a measurement object. First alignment measurements are carried out while the measurement object is being moved through the MR facility, wherein at least one MR system parameter of the MR facility is configured to the measurement object of the first alignment measurements. A second alignment measurement is also carried out in which the measurement object is stationary in a fixed position in the MR facility, wherein the second alignment measurement includes an iterative alignment method in which the at least one MR system parameter for the recording of MR signals of the measurement object is iteratively configured to the measurement object in the fixed position in the MR facility, wherein for the iterative alignment method the aligned MR system parameter is chosen from the aligned MR system parameters.

МRI аppаrаtus аnd RF trаnsmit gаin sеtting mеthоd

Аn МRI аppаrаtus whiсh оbtаins а tоmоgrаm оf аn оbjесt bу utilizing mаgnеtiс rеsоnаnсе inсludеs а саlibrаting dеviсе whiсh figurеs оut а rеlаtiоnship bеtwееn а сеntеr frеquеnсу аnd аn оptimаl gаin оf RF trаnsmissiоn with rеspесt tо а prеdеtеrminеd rаngе оf сеntrаl frеquеnсiеs, а sаving dеviсе whiсh sаvеs infоrmаtiоn ехprеssing sаid rеlаtiоnship, аnd а sеtting dеviсе whiсh sеts thе RF trаnsmissiоn gаin ассоrding tо thе сеntеr frеquеnсу during subsеquеnt sсаnning bу utilizing thе sаvеd infоrmаtiоn.

MAGNETIC RESONANCE IMAGING APPARATUS AND IMAGING-TIME SHORTENING METHOD

A magnetic resonance imaging apparatus includes sequence control circuitry and processing circuitry. In CEST imaging the sequence control circuitry performs a first sequence and a second sequence under different saturation pulse conditions. The first sequence is for acquiring first magnetic resonance signals corresponding to a first frequency region of a k-space and second magnetic resonance signals corresponding to a second frequency region of the k-space. The second sequence is for acquiring third magnetic resonance signals corresponding to at least the first frequency region. The processing circuitry assigns the third magnetic resonance signals and the second magnetic resonance signals to a single k-space generated for the second sequence. Frequency including the first frequency region is lower than frequency including the second frequency region.

MAGNETIC RESONANCE IMAGING APPARATUS, IMAGE PROCESSING APPARATUS, AND IMAGE PROCESSING METHOD

A volume rendering image is obtained based on a 3D MRI image by automatically performing appropriate opacity setting. A three-dimensional image of a subject is received, a distribution of pixel values of the three-dimensional image is calculated, a pixel value of a predetermined feature amount is calculated based on the distribution of the pixel values, and opacity is set for each of the pixel value included in the three-dimensional image based on the pixel value of the feature amount. Accordingly, the opacity can be set automatically. The volume rendering image of the three-dimensional image is generated using the opacity.

PATIENT/EQUIPMENT POSITIONING ASSISTANCE BY DEPTH IMAGING

A device, system, method (100) and computer-program product are disclosed for assisting in the positioning of objects, including a subject and/or auxiliary equipment, on a subject support in an imaging and/or therapy session. The method comprises acquiring (101) image/spatial data that comprises depth/3D information, using a camera system, of the subject support having (an) object(s) placed thereon. The method comprises obtaining (111) reference data, comprising reference depth/3D information, representative of the subject support without the object(s) placed thereon. From the image and/or spatial data, at least one geometric attribute of the (or each) object is determined, in which this determining (104) comprises detecting (105) the object(s) by taking the reference depth/3D information data and the depth/3D information in said acquired image and/or spatial data into account.

METHODS FOR ACQUIRING A MAGNETIC RESONANCE IMAGE DATASET AND FOR GENERATING A MOTION-CORRECTED IMAGE DATASET

The invention is directed to a method for acquiring a magnetic resonance image dataset (10) of an object (U), using an imaging protocol in which several k-space lines (22) are acquired in one shot (12), the imaging protocol comprising a plurality of shots (12). A plurality of additional k-space lines (24) are acquired in at least a subset of the shots (12), in order to detect movement of the object (U) throughout the imaging protocol. The invention is also directed to a method for generating a motion-corrected magnetic resonance image dataset from the dataset (10) thus acquired, a magnetic resonance imaging apparatus (1) and a computer program.

МАГНИТНО-РЕЗОНАНСНАЯ ВИЗУАЛИЗАЦИЯ ВДОЛЬ ОСИ УСТРОЙСТВА ДОСТАВКИ ЭНЕРГИИ

Группа изобретений относится к медицине, а именно к способу управления медицинским устройством. Машиночитаемый носитель информации содержит машиночитаемые инструкции для исполнения процессором, управляющим медицинским термотерапевтическим устройством, способа, содержащего этапы, на которых принимают данные размещения, указывающие размещение целевого объема; управляют системой позиционирования для вращения терапевтического устройства, содержащего устройство доставки энергии, вокруг продольной оси терапевтического устройства; управляют устройством доставки энергии для доставки энергии в целевой объем в первом положении вращения относительно продольной оси по траектории вращения терапевтического устройства с использованием данных размещения; определяют первый фиксированный набор плоскостей среза, перпендикулярный продольной оси катетера в первом положении вращения, который должен быть визуализирован модулем магнитно-резонансной визуализации; управляют модулем магнитно-резонансной визуализации ...

ЭФФЕКТИВНЫЕ ПОСЛЕДОВАТЕЛЬНОСТИ ВЫПОЛНЯЕМЫХ ДЕЙСТВИЙ МАГНИТНО-РЕЗОНАНСНОЙ ВИЗУАЛИЗАЦИИ СЕРДЦА НА ОСНОВАНИИ АВТОМАТИЗИРОВАННОГО ПЛАНИРОВАНИЯ ПО ОБЗОРНЫМ ИССЛЕДОВАНИЯМ ПО ТЕХНОЛОГИИ MDIXON

Использование: для планирования проекций сердца с использованием магнитно-резонансной визуализации (МРВ). Сущность изобретения заключается в том, что система (10) для планирования проекций сердца с использованием магнитно-резонансной визуализации (МРВ) содержит устройство (16) планирования, которое включает в себя по меньшей мере один процессор (42), запрограммированный с возможностью: приема одного или более изображений (18) из устройства (12) визуализации, полученных с использованием протокола mDIXON, определения положения и ориентации исследуемого объекта по одному или более изображениям, преобразования модели объекта интереса таким образом, что она согласуется с исследуемым объектом, с помощью обобщенного преобразования Хафа, и формирования одной или более проекций исследуемого объекта на основании согласования исследуемого объекта. Устройство (48) отображения отображает одну или более проекций исследуемого объекта. Технический результат: обеспечение возможности автоматизированного ...

МОДИФИКАЦИЯ ПАРАМЕТРОВ ПОСЛЕДОВАТЕЛЬНОСТИ ИМПУЛЬСОВ ДЛЯ МАГНИТНО-РЕЗОНАНСНОЙ ВИЗУАЛИЗАЦИИ

АВТОМАТИЧЕСКОЕ ПОСЛЕДОВАТЕЛЬНОЕ ПЛАНИРОВАНИЕ МР-СКАНИРОВАНИЯ

... 1. Способ получения посредством устройства по меньшей мере одного клинического МРТ-изображения субъекта, причем способ содержит следующие этапы:- получение посредством устройства первого осмотрового изображения с первым полем наблюдения, первое осмотровое изображение имеет первое пространственное разрешение,- определение посредством устройства местоположения первой области, представляющей интерес, и набора анатомических ориентиров в первом осмотровом изображении,- определение посредством устройства положения и ориентации первой области, представляющей интерес, используя набор анатомических ориентиров, причем положение и ориентацию первой области используют для планирования второго осмотрового изображения,- получение посредством устройства второго осмотрового изображения со вторым полем наблюдения, причем второе осмотровое изображение имеет второе пространственное разрешение, и второе пространственное разрешение выше, чем первое пространственное разрешение,- создание посредством устройства ...

СПСОБ ГЕНЕРАЦИИ МНОГОДИАПАЗОННЫХ РЧ ИМПУЛЬСОВ

МР-ТОМОГРАФИЯ, ИСПОЛЬЗУЮЩАЯ ПАРАЛЛЕЛЬНОЕ ПОЛУЧЕНИЕ СИГНАЛА

... 1. Способ МР-томографии по меньшей мере части тела (10) пациента, помещенного в исследуемый объем МР-устройства (1), причем способ содержит этапы, на которых- подвергают часть тела (10) первой импульсной последовательности для получения набора (21, 22) данных обзорного сигнала, причем этот набор (21, 22) данных обзорного сигнала включает в себя МР-сигналы, принятые параллельно или последовательно через- объемную РЧ-катушку (9), имеющую по существу гомогенный профиль пространственной чувствительности в пределах исследуемого объема, и- набор из по меньшей мере двух матричных РЧ-катушек (11, 12, 13), имеющих различные профили пространственной чувствительности в пределах исследуемого объема,при этом первая импульсная последовательность содержит РЧ-импульсы и градиенты переключаемого магнитного поля, управляемые таким образом, что набор (21, 22) данных обзорного сигнала получают при первом разрешении изображений;- подвергают часть тела (10) второй импульсной последовательности для получения ...

АВТОМАТИЧЕСКАЯ ГРУППИРОВКА МАГНИТНО-РЕЗОНАНСНЫХ ИЗОБРАЖЕНИЙ

СПОСОБ МАГНИТОРЕЗОНАНСНОЙ ТОМОГРАФИИ (MRI) ДЛЯ НАЗНАЧЕНИЯ ИНДИВИДУАЛЬНЫМ ПИКСЕЛАМ ИЛИ ВОКСЕЛАМ СПЕЦИФИЧЕСКИХ ДЛЯ ТКАНИ ЗНАЧЕНИЙ ОСЛАБЛЕНИЯ ПОЗИТРОННО-ЭМИССИОННОЙ ТОМОГРАФИИ (РЕТ)

... 1. Система (10), содержащая:сканер (48) магнитного резонанса (MR), задающий объем (16) исследования; ипо меньшей мере один процессор (54), запрограммированный для:управления MR сканером (48) для применения последовательностей формирования изображения к объему (16) исследования;в ответ на последовательности формирования изображения, выделения данных MR фазы из последовательности получений времен эхо-сигналов (TE); иидентификации изменения в фазе по времени данных MR фазы для идентификации различных типов ткани и/или материала, обнаруженных в объеме (16) исследования.2. Система по п. 1, в которой по меньшей мере один процессор (54) дополнительно запрограммирован для:развертки фазы данных MR фазы; игенерации последовательности карт накопления фазы, соответствующих последовательности TE получений из развернутых данных MR фазы, причем изменение в фазе сгенерировано из карт накопления фазы.3. Система (10) по п. 2, в которой по меньшей мере один процессор (54) дополнительно запрограммирован для ...

АДАПТИВНОЕ УПРАВЛЕНИЕ УДЕЛЬНОЙ МОЩНОСТЬЮ ПОГЛОЩЕНИЯ (SAR) ДЛЯ ПОЛУЧЕНИЯ МАГНИТНО-РЕЗОНАНСНОГО ИЗОБРАЖЕНИЯ

... 1. Система (1) получения магнитно-резонансного изображения, содержащая:по меньшей мере одну радиочастотную (RF) передающую катушку (6), передающую измеренную RF-мощность для возбуждения и манипулирования магнитным резонансом в тканях субъекта (57) в области исследования;RF-передатчик (34), управляющий количеством переданной RF-мощности, основываясь на удельной мощности поглощения (SAR) для последовательности получения изображений;антропометрический блок (28), определяющий массу части субъекта, которая принимает переданную RF-мощность, основываясь на общей массе субъекта; иблок (40) адаптивной SAR (40), регулирующий выбранную последовательность сканирования, основываясь на SAR для фактического, не самого худшего случая, определенной из измеренной переданной RF-мощности и измеренной отраженной мощности, и массе части субъекта, принимающей переданную RF-мощность.2. Система (1) по п. 1, дополнительно включающая в себя:блок (38) реконструкции, реконструируирующий изображения, исходя из контрольного ...

КОНСТРУКЦИЯ СХЕМЫ ПИТАНИЯ ДЛЯ ПОДАЧИ РАДИОЧАСТОТНОГО СИГНАЛА НА МНОЖЕСТВО КАТУШЕЧНЫХ ЭЛЕМЕНТОВ В МАГНИТНО-РЕЗОНАНСНОЙ СИСТЕМЕ КАТУШЕК

... 1. Конструкция (18) схемы питания для подачи радиочастотного сигнала на множество катушечных элементов (14) магнитно-резонансной системы (12) катушек, причем конструкция (18) схемы содержитглавную линию (20) для присоединения к источнику (16) радиочастотного сигнала;множество питающих линий (22), причем каждая питающая линия (22) для присоединения соответствующего катушечного элемента (14) системы (14) катушек;делитель (24) мощности, расположенный между главной линией (20) и множеством питающих линий (22) для распределения сигнала на главной линии (20) по каждой из питающих линий (22),при этом по меньшей мере одна из питающих линий (22) содержит управляемую переключающую схему (26) с переключающим элементом (28) для соединения/разъединения двух образующихся линейных секций (30, 32) питающей линии (22), причем первая линейная секция (30) на стороне разделителя и вторая линейная секция (32) на стороне, присоединяемой к катушечному элементу (14), ипри этом переключающая схема (26) дополнительно ...

ОПРЕДЕЛЕНИЕ ТЕМПЕРАТУРЫ С ПОМОЩЬЮ КАРТИРОВАНИЯ ПОЛЯ В1

... 1. Медицинское устройство (600, 700, 800, 900, 1000), содержащее:- систему (602) магнитно-резонансной визуализации, содержащую магнит (604) с зоной (608) визуализации для получения данных (642, 748) магнитного резонанса от пациента (618) из зоны визуализации;- память (632) для хранения исполнимых машиной команд (660, 662, 664, 760, 762, 764);- процессор (626) для управления медицинским устройством, причем исполнение команд побуждает процессор:- получать (100, 200, 300, 400, 506) данные (642) магнитного резонанса карты поля В1 с помощью системы магнитно-резонансной визуализации, причем данные магнитного резонанса карты поля В1 содержат данные или информацию, которые могут быть использованы для составления карты поля В1; и- вычислять карту проводимости и/или карту диэлектрической проницаемости с помощью данных магнитного резонанса карты поля В1; и- определять (102, 206, 306, 408, 512) карту (646) температуры, по меньшей мере, частично с помощью карты проводимости и/или карты диэлектрической ...

ЭМУЛЯЦИЯ ВИРТУАЛЬНЫХ КАТУШЕК В МРТ С ПАРАЛЛЕЛЬНОЙ ПЕРЕДАЧЕЙ

... 1. Способ выполнения магнитно-резонансной томографии для получения магнитно-резонансной томограммы объекта (10), в котором сканирование выполняют с использованием физической компоновки (9; 11; 12; 13) катушек, содержащей набор отдельных передающих катушек, причем катушки выполнены с возможностью передачи поля RF-передачи к объекту (10) для магнитно-резонансного спинового возбуждения объекта (10), причем каждая катушка ассоциирована с физическим каналом передачи, причем способ содержит этапы, на которых:a) выбирают желаемое поле RF-передачи, которое должно быть сгенерировано катушками, причем упомянутое поле RF-передачи соответствует виртуальной компоновке из двух или более упомянутых катушек, причем характеристики виртуальных каналов передачи, содержащие веса виртуальных каналов передачи, назначают полю RF-передачи, причем упомянутые веса виртуальных каналов передачи, описывающие виртуальные комплексные амплитуды RF-поля в отношении каждой отдельной катушки виртуальной компоновки катушек ...

Verfahren zur Ermittlung wenigstens eines PET-Parameters

Verfahren zur Ermittlung wenigstens eines PET-Parameters für eine PET-Untersuchung in einem kombinierten, zur isozentrischen Messung ausgebildeten Magnetresonanz-PET-Gerät, dadurch gekennzeichnet, dass aus wenigstens einem aus zur Ermittlung von patientenspezifischen Untersuchungsparametern für eine Magnetresonanzuntersuchung aufgenommenen Magnetresonanzdaten abgeleiteten patientenspezifischen Informationswert wenigstens eine Akquisitionszeit für die PET-Untersuchung als PET-Parameter ermittelt und angezeigt und/oder zur Ansteuerung des Gerätes verwendet wird, wobei als patientenspezifischer Informationswert die spezifische Absorptionsrate verwendet wird.

Verfahren zur Ermittlung einer Schwächungskarte zur Verwendung in der Positronenemissionstomographie und von Homogenitätsinformationen des Magnetresonanzmagnetfeldes

Verfahren zur Ermittlung einer Schwächungskarte zur Verwendung in der Positronenemissionstomographie und von Homogenitätsinformationen des Magnetresonanzmagnetfeldes, insbesondere zwecks einer Ermittlung von Shimeinstellungen, im Rahmen einer einzigen Magnetresonanz-Bildaufnahme, wobei- zunächst im Rahmen einer dreidimensionalen Gradientenechosequenz jeweils ein erster und ein zweiter Bilddatensatz bei einer ersten und einer zweiten Echozeit aufgenommen wird, wobei bei der ersten Echozeit die Phasendifferenz zwischen dem Wasser- und dem Fettsignal Null und bei der zweiten Echozeit 180 Grad beträgt,- die Schwächungskarte aus mittels einer Dixontechnik, insbesondere einer 2-Punkt-Dixon-Technik, aus den Bilddatensätzen gewonnenen Fett/Wasser-Verhältnissen ermittelt wird,- wenigstens für den zweiten Bilddatensatz durch Nutzen einer Maske alle Voxel mit einer unterhalb eines ersten Schwellwertes liegenden Signalintensität ausgeschlossen werden und- zur Ermittlung der Homogenitätsinformationen ...

Verfahren zur Flussmessung mittels einer Magnetresonanzanlage sowie entsprechend ausgestaltete Magnetresonanzanlage

Ein Verfahren zur Flussmessung mittels einer Magnetresonanzanlage (15) sowie eine entsprechend ausgestaltete Magnetresonanzanlage (15) werden offenbart. Dabei umfasst das Verfahren folgende Schritte: · Bestimmen von Angiographiemessdaten eines Volumens (25) innerhalb eines zu untersuchenden Körpers (O), · Bestimmen eines Gefäßes (2) in Abhängigkeit einer Benutzereingabe mittels der Angiographiemessdaten, · automatisches Bestimmen von Ausmaßen und einer Orientierung des Gefäßes (2) mittels der Angiographiemessdaten, · automatisches Bestimmen einer Schichtgeometrie (4) für die Flussmessung abhängig von den Ausmaßen und der Orientierung, und · Durchführen der Flussmessung mittels der Schichtgeometrie (4).

Verfahren und Steuereinrichtung zum Betrieb einer Magnetresonanzanlage

Verfahren zum Betrieb einer Magnetresonanzanlage (1) zur Aufnahme von Magnetresonanzbilddaten (BD) eines Untersuchungsobjekts (O), welche Magnetresonanzanlage (1) eine Anzahl von Teilsystemen (4, 5, 6, 7, 8, 14, 15, 16, 17, 18) und eine Steuereinrichtung (10) aufweist, wobei mit Hilfe der Steuereinrichtung (10) für eine Nutzmessung eine Anzahl von Justagemessungen zur Justage zumindest eines Teilsystems (4, 5, 6, 7, 8, 14, 15, 16, 17, 18) durchgeführt werden, bei denen jeweils ein der betreffenden Justagemessung zugeordnetes Justagevolumen (JVJV, JV, JV) berücksichtigt wird, das zumindest einen Teilbereich eines das Untersuchungsobjekt (O) enthaltenden Körpers umfasst, dadurch gekennzeichnet, dass von der Steuereinrichtung (10) innerhalb von Bilddaten (UBUB) des Untersuchungsobjekts (O) festgelegte, eine Lage und/oder eine Abmessung des Untersuchungsobjekts (O) charakterisierende Markierungen (M, M, M) ermittelt werden und darauf basierend von der Steuereinrichtung (10) automatisch die ...

Anpassung der Mittenfrequenzen und der Bandbreiten bei der MR-Bildgebung

Verfahren zum Betreiben einer Empfangseinrichtung (10) für MR-Bildsignale eines Körpers (12, 48), bei dem zu wenigstens einem Spulenelement (1428, 50, 52) der Empfangseinrichtung (10) ein Raumbereich (34, 58, 60) ermittelt wird, in welchem eine räumliche Sensitivität des Spulenelements (1428, 50, 52) ein vorbestimmtes Kriterium erfüllt, zu dem Raumbereich (34, 58, 60) die Mittenfrequenz und die Bandbreite (fbw) des darin von dem Körper (12, 48) abgestrahlten MR-Bildsignals ermittelt werden und ein dem Spulenelement (1428, 50, 52) nachgeschalteter Empfangspfad für einen Betrieb bei der so ermittelten Mittenfrequenz und der Bandbreite (fbw) parametriert wird, dadurch gekennzeichnet, dass a) anhand des Kriteriums der Anfang (X1) und das Ende (X2) des Raumbereichs (34, 58, 60) entlang einer durch ein Auslesegradientenfeld festgelegten Frequenzkodierachse (X) ermittelt werden und/oder b) anhand des Kriteriums der Anfang und das Ende des Raumbereichs (34, 58, 60) entlang einer durch ein Verfahren ...

Vorrichtung und Verfahren für eine asymmetrische Busschnittstelle einer Lokalspule

Die Erfindung betrifft eine Lokalspule sowie ein System aus einem Magnetresonanztomographen mit einer Lokalspule. Die Lokalspule weist eine Datenquelle und einen Signalausgang in Signalverbindung mit der Datenquelle zur Ausgabe von Daten der Datenquelle auf. Die Datenquelle ist ausgelegt, eine Vielzahl an Daten über den Signalausgang zu übertragen. Der Signalausgang weist dazu eine Hochfrequenzquelle und einen Modulator auf und ist ausgelegt, die Daten der Datenquelle mittels des Modulators auf eine Trägerfrequenz der Hochfrequenzquelle zu modulieren zu übertragen.

Ermittlung einer Pulssequenz für eine Magnetresonanzanlage auf Basis von k-Raum-Stützpunkten

Verfahren zur Ermittlung einer Pulssequenz für eine Magnetresonanzanlage (1) mit folgenden Schritten: Erfassung von Steuerprotokoll-Parameterwerten (SP), Ermittlung von k-Raum-Trajektorien-Stützpunkten (S0, S1, S2, S3, ..., S7) innerhalb des k-Raums (Rk) auf Basis der Steuerprotokoll-Parameterwerte (SP), Ermittlung von den k-Raum-Trajektorien-Stützpunkten (S0, S1, S2, S3, ..., S7) zugeordneten Stützpunkt-Zeiten (t1, t2, ..., t7) auf Basis zumindest einiger der Steuerprotokoll-Parameterwerte (SP), Ermittlung von k-Raum-Trajektorien und der Verläufe von Gradientenpulsfolgen zum Erreichen der k-Raum-Trajektorien-Stützpunkte (S0, S1, S2, S3, ..., S7) zu den zugeordneten Stützpunkt-Zeiten (t1, t2, ..., t7), Ermittlung von exakten Zeitvorgabeparameterwerten für Hochfrequenzpulse und Auslesezeitbereichen unter Berücksichtigung der k-Raum-Trajektorien, Ermittlung der Pulssequenz (S) auf Basis der k-Raum-Trajektorien-Stützpunkte (S0, S1, S2, S3, ..., S7).

Patientenlagerungsvorrichtung für eine medizinische Bildgebungsvorrichtung, sowie eine medizinische Bildgebungsvorrichtung mit der Patientenlagerungsvorrichtung

Die Erfindung geht aus von einer Patientenlagerungsvorrichtung für eine medizinische Bildgebungsvorrichtung, insbesondere eine Magnetresonanzvorrichtung (10), mit einem Liegen tisch (31), einer Hubeinheit (33) zu einem vertikalen Bewegen des Liegentischs (31), einer Fortbewegungseinheit (32), und mit zumindest einer Sensoreinheit (46, 62, 71) zu einem Erfassen zumindest einer Gewichtskenngröße zu einer Ermittlung eines Patientengewichts, wobei die zumindest eine Sensoreinheit (46, 62, 71) zumindest ein Sensorelement (46, 47, 63, 64, 72, 73, 74) aufweist, das an der Hubeinheit (33) und/oder an der Fortbewegungseinheit (32) angeordnet ist.

Automatisches Bestimmen einer Schichtpositionierung für eine Magnetresonanz-Untersuchung

Verfahren zur Konfiguration einer Schichtpositionierung einer Untersuchungsperson (11) für eine Magnetresonanzuntersuchung in einer Magnetresonanzanlage (9), wobei das Verfahren umfasst: – automatisches Bestimmen einer Lokalisierungsinformation, welche eine Anordnung der Untersuchungsperson (11) in der Magnetresonanzanlage (9) in Bezug auf eine bestimmte Referenzposition (12) bereitstellt, – automatisches Bestimmen von mindestens einer Ausrichtungsinformation auf der Grundlage der Lokalisierungsinformation, wobei eine jeweilige Ausrichtungsinformation einem jeweiligen bestimmten Untersuchungsbereich der Untersuchungsperson (11) zugeordnet ist und eine Positionierungsinformation für eine für den jeweiligen Untersuchungsbereich geeignete Schichtpositionierung umfasst, – Erfassen mindestens einer Schichtpositionierungseingabe von einer Bedienperson der Magnetresonanzanlage (9), wobei eine jeweilige Schichtpositionierungseingabe ein Erfassen einer manuellen Positionierungsinformation umfasst ...

Verfahren zur Korrektur einer Signalphase bei der Aufnahme von Magnetresonanzsignalen, Magnetresonanzeinrichtung, Computerprogramm und Datenträger

Verfahren zur Korrektur einer Signalphase bei der Aufnahme von Magnetresonanzsignalen eines Untersuchungsobjekts in einem Schichtmultiplexverfahren, bei dem Magnetresonanzsignale aus zumindest zwei unterschiedlichen Schichten des Untersuchungsobjekts gleichzeitig detektiert werden, wobei in wenigstens einer Schichtselektionszeitspanne (3) ein Schichtselektionsgradient mittels eines auszugebenden Schichtselektionsgradientenpulses (5, 5') erzeugt wird, während dem für jede der Schichten jeweils ein Hochfrequenzpuls (1, 1', 4, 4') mit schichtspezifischer Frequenz ausgesendet wird und sich die Hochfrequenzpulse (1, 1', 4, 4') der unterschiedlichen Schichten wenigstens teilweise zeitlich überlappen, wobei- eine anzuwendende schichtspezifische, lineare Korrekturphase für jede der unterschiedlichen Schichten bestimmt wird, und- für jeden der Hochfrequenzpulse (1, 1', 4, 4') aus der Korrekturphase und den Eigenschaften des Schichtselektionsgradienten (5, 5') ein zeitlicher Versatz relativ zu einem ...

Verfahren zur Optimierung der k-Raum-Trajektorien bei der Ortskodierung eines Magnetresonanz-Tomographiegerätes und Gerät zur Durchführung des Verfahrens

Verfahren und Steuervorrichtung zur Ansteuerung eines Magnetresonanzsystems

Es wird ein Verfahren zur Ansteuerung eines Magnetresonanzsystems (100) beschrieben. In dem Verfahren wird folgende Pulssequenz ausgespielt: ein erster schichtselektiver Anregungspuls (11, 21), der eine erste Schicht (41) mit einer ersten Magnetisierung anregt, dann ein zweiter schichtselektiver Anregungspuls (12, 32), der eine zweite Schicht (44) mit der ersten Magnetisierung anregt. Es wird ein dritter schichtselektiver Anregungspuls (13, 23), der die erste Schicht (41) mit einer die erste Magnetisierung aufhebenden zweiten Magnetisierung anregt und ein vierter schichtselektiver Anregungspuls (14, 34), der die zweite Schicht (44) mit einer die erste Magnetisierung aufhebenden Magnetisierung anregt. Die erste Schicht (41) und die zweite Schicht (44) überschneiden sich. Darüber hinaus betrifft die Erfindung eine Steuervorrichtung (106) zur Ansteuerung eines Magnetresonanzsystems (100) mit wenigstens einem Hochfrequenz-Sendekanal (112a, 112b, 112c, 112d) über den die Pulssequenz ausgespielt ...

MR-Sättigung unter Berücksichtigung der abzubildenden anatomischen Strukturen

Es wird ein Verfahren zum Ermitteln einer Ansteuersequenz zur Ansteuerung eines Magnetresonanzbildgebungssystems zur Erzeugung von Magnetresonanzbilddaten eines abzubildenden Bereichs eines Untersuchungsobjekts, von dem Magnetresonanzrohdaten erfasst werden, beschrieben. Bei dem Verfahren werden Informationen bezüglich der anatomischen Struktur eines abzubildenden Bereichs des Untersuchungsobjekts ermittelt. Weiterhin werden in dem abzubildenden Bereich ein Umgebungsbereich und ein Zentrumsbereich in Abhängigkeit der ermittelten anatomischen Struktur festgelegt. Zudem wird eine eindimensionale Wasser/Fettsättigungspulsfolge zur Sättigung der Umgebungsbereiche ermittelt und eine mehrdimensionale Wasser/Fettsättigungspulsfolge zur Sättigung des Zentrumsbereichs ermittelt. Es wird auch ein Verfahren zur Ansteuerung eines Magnetresonanzbildgebungssystems zur Erzeugung von Magnetresonanzbilddaten eines Untersuchungsobjekts, bei dem Magnetresonanzrohdaten erfasst werden, beschrieben. Ferner wird ...

medical image diagnosis apparatus and a controlling method

A medical image diagnosis apparatus according to the present embodiments includes a storage and an execution controller. The storage is configured to store therein a program for executing a plurality of processes contained in an image taking procedure or a plurality of processes contained in a post-processing procedure, while the processes are classified into a first group for which an input operation from an operator is received and a second group for which the input operation is not received, and the processes are associated with one another according to an order. The execution controller is configured to exercise control so that the processes are executed according to the order. When executing a process classified into the first group, the program displays information selected according to a purpose of the image taking procedure or the post-processing procedure, as an operation screen.

Magnetic resonance imaging apparatus and magnetic resonance imaging method

According to one embodiment, a MRI apparatus includes an acquisition unit, a reference section information calculating unit, a positioning unit and an imaging unit. The acquisition unit acquires frames of section image data including a heart from an object with use of magnetic resonance. The reference section information calculating unit calculates spatial positional information of a reference section of the heart based on the frames of the section image data. The positioning unit displays a reference section image of the heart on a display unit and performs positioning of an imaging part for imaging through the displayed reference section image of the heart. The reference section image is calculated from the frames of the section image data based on the positional information of the reference section. The imaging unit images the imaging part set by the positioning.

Magnetic resonance diagnosis apparatus and data acquisition method of magnetic resonance spectroscopy

In one embodiment, a magnetic resonance diagnosis apparatus includes an application region calculation unit and a data generation unit. The application region calculation unit automatically calculates an application region of a prepulse based on “image data including a region of interest of an object generated by magnetic resonance imaging before application of a prepulse”. The data generation unit applies the prepulse according to the application region automatically calculated by the application region calculation unit, then receives a magnetic resonance signal from a data acquisition region including the region of interest, and generates magnetic resonance spectrum data indicative of concentration distribution per metabolic substance in the region of interest based on the magnetic resonance signal.

Method and system for determining a magnetic resonance system activation sequence

A method and control sequence determination facility for determining a magnetic resonance system activation sequence that includes a multichannel pulse train with a plurality of individual HF-pulse trains to be emitted by the magnetic resonance system via different independent high-frequency transmit channels of a transmit facility in a parallel manner are described. The multichannel pulse train is calculated based on a k-space gradient trajectory and a predetermined target magnetization using an HF pulse optimization method. In the HF pulse optimization method, optimization of the multichannel pulse train and/or the k-space gradient trajectory takes account of at least one hardware operating parameter of the transmit facility.

MAGNETIC RESONANCE IMAGING APPARATUS AND RF PULSE CONTROL METHOD

Disclosed are a magnetic resonance imaging apparatus and an RF pulse control method wherein an RF pulse sequence in a start-up sequence is set as a monotonically increasing flip angle with offset, in order to reduce ghosts, blurring, and other artifacts during measurement in a transient state. For example, the sum of two adjacent consecutive terms in a monotonically increasing sequence is set as the flip angle. Specifically, the number of RF pulses in the RF pulse sequence and the flip angle for the RF pulses in an SSFP sequence are set, and the monotonically increasing flip angle with offset is found, based on the set number of RF pulses in the RF pulse sequence and the flip angle for the RF pulses in the SSFP sequence, and used as the RF pulse sequence. 1. A magnetic resonance imaging apparatus comprising:a calculation processing unit configured to generate an imaging sequence formed by a start-up sequence for suppressing the oscillation of spins in a transient state by the RF pulse sequence of which the flip angle monotonically increases and an SSFP sequence for measuring echo signals in a steady state; anda measurement control unit configured to control the measurement of the echo signals from an object to be examined on the basis of the imaging sequence,wherein the RF pulse sequence is that of which the flip angle monotonically increases with offset.2. The magnetic resonance imaging apparatus according to claim 1 , wherein the offset is the value which changes according to flip angle (α) of the RF pulse in the SSFP sequence and the number of RF pulses (N) in the RF pulse sequence.3. The magnetic resonance imaging apparatus according to claim 2 , further comprising input means configured to receive the input of flip angle (α) of the RF pulse in the SSFP sequence and the number of RF pulses (N) in the RF pulse sequence.4. The magnetic resonance imaging apparatus according to claim 2 , wherein the flip angle of the RF pulse sequence is the sum of the adjacent two ...

Magnetic resonance imaging apparatus

In one embodiment, an MRI apparatus ( 20 ) includes a main scan executing unit for executing a main scan, an image reconstruction unit ( 90 ) for reconstructing image data based on MR signals acquired in the main scan, a calibration scan setting unit ( 100 ), a calibration scan executing unit, and a condition determining unit. The calibration scan setting unit calculates a condition of a calibration scan for determining “an imaging condition of the main scan” or “a condition of correction processing of the image data”, based on a type of an RF coil device and an imaging part. The calibration scan executing unit executes the calibration scan based on the condition of the calibration scan. The condition determining unit determines “the imaging condition of the main scan” or “the condition of the correction processing”, based on an execution result of the calibration scan.

Method and apparatus for performing dual-modality imaging

A method for performing an examination of a patient using a dual-modality imaging system includes accessing a list that includes a magnetic resonance imaging (MRI) examination protocol to be used to perform a predetermined MRI examination, the examination protocol including a plurality of MRI protocol actions, receiving an input selecting at least one of the MRI protocol actions, scanning the patient using the MRI examination protocol, scanning the patient using a positron emission tomography (PET) imaging system to acquire PET data, and marking the PET data, using a first visual indication, to indicate the selected MRI protocol action. An imaging system and a non-transitory computer readable medium are also described herein.

Method for Determining a Control Sequence with Parallel Transmission

A method for determining a set of control parameters of a control sequence for a magnetic resonance device is provided. The set of control parameters is chosen from a plurality of sets of basic parameters. The method includes determining a mean flip angle for each set of basic parameters in an imaging region where an object exists using the set of basic parameters with a first measuring method. For each set of basic parameters, a signal strength of a magnetic resonance signal generated in the case of a reference flip angle of a second measuring method distinguished by a signal maximum or a signal minimum is determined, and the set of basic parameters having a signal strength that is extremal in accordance with the choice of reference flip angle is chosen as the set of control parameters.

VIRTUAL COIL EMULATION IN PARALLEL TRANSMISSION MRI

The invention relates to a virtual coil emulation method to be used in a magnetic resonance imaging scan for acquiring a magnetic resonance image of an object (), wherein the scan is performed by an MR system () using a physical coil arrangement () comprising set of individual transmit coils, the coils being adapted for transmission of a desired RF transmit field to the object () for magnetic resonance spin excitation of the object (), wherein each coil is associated with a physical transmit channel, wherein the RF transmit field corresponds to a virtual arrangement of two or more of said coils, wherein virtual transmit channel properties comprising virtual transmit channel weights are assigned to the RF transmit field, said virtual transmit channel weights describing the virtual complex RF field amplitudes with respect to each individual coil of the virtual coil arrangement required to be applied to the physical coils () for generating the RF transmit field. 1. A method of performing a magnetic resonance imaging scan for acquiring a magnetic resonance image of an object , wherein the scan is performed using a physical coil arrangement comprising set of individual transmit coils , the coils being adapted for transmission of an RF transmit field to the object for magnetic resonance spin excitation of the object , wherein each coil is associated with a physical transmit channel , the method comprising:a) selecting a desired RF transmit field to be generated by the coils, said RF transmit field corresponding to a virtual arrangement of two or more of said coils, wherein virtual transmit channel properties comprising virtual transmit channel weights are assigned to the RF transmit field, said virtual transmit channel weights describing the virtual complex RF field amplitudes with respect to each individual coil of the virtual coil arrangement required to be applied to the physical coils for generating the RF transmit field,b) transforming the virtual transmit channel ...

MAGNETIC RESONANCE IMAGING APPARATUS

A magnetic resonance imaging apparatus according to embodiments includes an executing unit, an informing unit, a detecting unit, and a determining unit. The executing unit executes a pulse sequence to collect data of a subject at a constant cycle. The informing unit informs the subject of a timing of breathing in synchronization with the cycle at which the pulse sequence is executed. The detecting unit detects a breathing level or a respiratory cycle of the subject. The determining unit determines, when the pulse sequence is executed, whether to use the data collected by the pulse sequence for image reconstruction in accordance with the breathing level or the respiratory cycle of the subject. 1. A magnetic resonance imaging apparatus comprising:an executing unit configured to execute a pulse sequence to collect data of a subject at a constant cycle;an informing unit configured to inform the subject of a timing of breathing in synchronization with the cycle at which the pulse sequence is executed;a detecting unit configured to detect a breathing level or a respiratory cycle of the subject; anda determining unit configured to determine, when the pulse sequence is executed, whether to use the data collected by the pulse sequence for image reconstruction in accordance with the breathing level or the respiratory cycle of the subject.2. The magnetic resonance imaging apparatus according to claim 1 , wherein the executing unit is configured to set up the cycle to execute the pulse sequence in accordance with an imaging condition set by an operator.3. The magnetic resonance imaging apparatus according to claim 1 , wherein the determining unit is configured to control the executing unit claim 1 , when the determining unit determines not to use the data collected by the pulse sequence for image reconstruction claim 1 , to re-collect the data at a later cycle than that of the pulse sequence.4. The magnetic resonance imaging apparatus according to claim 2 , wherein the ...

MAGNETIC RESONANCE IMAGING APPARATUS, MAGNETIC RESONANCE IMAGING METHOD AND MEDICAL SYSTEM

According to one embodiment, a magnetic resonance imaging apparatus includes an imaging condition setting unit and an imaging unit. The imaging condition setting unit is configured to set slice positions same as past slice positions to a same object and to set a table position of a bed with the object set to position a position representing a slice position designated out of the slice positions or a position representing a slice range designated out of the slice positions on a center of a magnetic field. The imaging unit is configured to acquire magnetic resonance data from the slice positions set for the object at the table position of the bed to generate image data corresponding to the slice positions based on the acquired magnetic resonance data. 1. A magnetic resonance imaging apparatus comprising:an imaging condition setting unit configured to set slice positions same as past slice positions to a same object and to set a table position of a bed with the object set to position a position representing a slice position designated out of the slice positions or a position representing a slice range designated out of the slice positions on a center of a magnetic field; andan imaging unit configured to acquire magnetic resonance data from the slice positions set for the object at the table position of the bed to generate image data corresponding to the slice positions based on the acquired magnetic resonance data.2. A magnetic resonance imaging apparatus of claim 1 ,wherein said imaging condition setting unit is configured to set the table position so as to locate a center position of slice positions, designated out of the slice positions, on the center of the magnetic field.3. A magnetic resonance imaging apparatus of claim 1 ,wherein said imaging condition setting unit is configured to set the table position so as to locate a slice range, designated out of the slice positions, within a predetermined range from the center of the magnetic field.4. A magnetic resonance ...

SYSTEM AND METHOD TO REDUCE POWER LOSS IN A GRADIENT AMPLIFIER

A gradient amplifier system, includes: a power stage comprising a plurality of bridge amplifiers, each operates at a first switching frequency; a gradient coil coupled to the power stage and configured to produce a magnetic field proportional to a coil current signal supplied by the power stage; a controller stage coupled to an input terminal of the power stage and configured to: generate a pulse width modulated gate signal based on the coil current signal and a reference current signal, wherein the pulse width modulated gate signal is generated at a second switching frequency when a slew rate associated with the reference current signal is below a threshold rate for at least a first time period; and apply the pulse width modulated gate signal to the power stage for changing an operating frequency of each of the plurality of bridge amplifiers from the first to the second switching frequency. 1. A gradient amplifier system , comprising:a power stage comprising a plurality of bridge amplifiers, wherein each of the plurality of bridge amplifiers operates at a first switching frequency;a gradient coil coupled to the power stage and configured to produce a magnetic field proportional to a coil current signal supplied by the power stage; generate a pulse width modulated gate signal based on the coil current signal and a reference current signal, wherein the pulse width modulated gate signal is generated at a second switching frequency upon occurrence of a slew rate associated with the reference current signal is below a determined threshold rate for at least a first time period; and', 'apply the generated pulse width modulated gate signal to the power stage for changing an operating frequency of each of the plurality of bridge amplifiers from the first switching frequency to the second switching frequency., 'a controller stage coupled to an input terminal of the power stage and configured to2. The gradient amplifier system of claim 1 , wherein the controller stage is ...

Systems and methods for automatic landmarking

Embodiments of systems, methods, and non-transitory computer readable media for automatic landmarking are presented. A coil including at least one marker is placed on a desired region on interest (ROI) of a subject. Further, a detector detects a position of the marker while translating the subject from a home position in an imaging system into a bore of a magnet in the imaging system. A positioning unit coupled to at least one of the coil, the marker and the detector is configured to initiate automatic translation of the subject from the home position into the magnet bore. Further, the positioning unit determines a distance between the detected marker position and a homogenous position of the magnet based at least on the detected marker position. The positioning unit then controls movement of the subject over the determined distance to the homogenous magnet position for automatically landmarking the desired ROI.

Magnetic Resonance Imaging Methods

A method of investigating an object using nuclear magnetic resonance (NMR) equipment includes generating a one-dimensional projection of the object for each of a plurality of echoes utilizing echo train signal indications resulting from pulse sequences, and utilizing the plurality of one-dimensional projections, for each of the plurality of echoes, generating NMR image data for at least one location in the object. The NMR image data may be displayed. The displayed data may include a T2 decay curve, a T2 value display, a T2 distribution graph, or petrophysical data for at least one object location. 1. A method of investigating an object using nuclear magnetic resonance (NMR) equipment , comprising the steps of:a) generating a field gradient along a set direction;b) obtaining a series of one-dimensional profiles of the object by subjecting the object under the field gradient to a series of RF pulse sequences, each RF pulse sequence generating a series of echoes and recording echo train signals resulting from the series of RF pulse sequences interacting with the object, each one-dimensional profile corresponding to a particular echo;c) changing the field gradient direction to different set directions while maintaining the magnitude of the field gradient, and repeating step b) for each different field gradient direction, thereby obtaining one-dimensional projections for each echo for each field gradient direction; andd) using the projections, generating NMR image data for each of a plurality of echoes for at least one location in the object.2. A method according to claim 1 , wherein the series of RF pulse sequences is generated by (1) setting the RF frequency to a set frequency claim 1 , (2) generating an NMR pulse sequence with the RF frequency at the set frequency claim 1 , (3) changing the RF frequency to a new set frequency and repeating step (2) claim 1 , and (4) repeating step (3) a number of times.3. A method according to claim 1 , wherein the series of RF pulse ...

Mri using faster multiplexed echo planar imaging (epi) pulse sequences

An MRI scanner and an MRI method that effectively reduce the inherent difference in timing of TE in the SIR images by using alternating polarity of the slice selective gradient pulse Gs and corresponding alternate polarity in RF phase offset in the excitation pulse. By using alternating polarity selective gradients, the refocusing gradient pulse on the Gs axis can be eliminated between the excitation pulses so that the time spacing between the multiple SIR excitation pulses is reduced, and therefore the time delay between onset of slice signal decay is reduced. This results in an earlier possible TE of the first excited slice, hence less signal decay and higher SNR, and overall the TE of different slices can be more nearly the same.

Method for Simultaneous Multi-Slice Magnetic Resonance Imaging

A method for multi-slice magnetic resonance imaging, in which image data is acquired simultaneously from multiple slice locations using a radio frequency coil array, is provided. By way of example, a modified EPI pulse sequence is provided, and includes a series of magnetic gradient field “blips” that are applied along a slice-encoding direction contemporaneously with phase-encoding blips common to EPI sequences. The slice-encoding blips are designed such that phase accruals along the phase-encoding direction are substantially mitigated, while providing that signal information for each sequentially adjacent slice location is cumulatively shifted by a percentage of the imaging FOV. This percentage FOV shift in the image domain provides for more reliable separation of the aliased signal information using parallel image reconstruction methods such as SENSE. In addition, the mitigation of phase accruals in the phase-encoding direction provides for the substantial suppression of pixel tilt and blurring in the reconstructed images. 1. A method for producing a plurality of images of a subject with a magnetic resonance imaging (MRI) system , the steps of the method comprising:a) applying, with the MRI system, a radio frequency (RF) excitation field to a portion of a subject that includes a plurality of slice locations, the plurality of slice locations including a current slice location and at least one adjacent slice location;b) sequentially producing a plurality of magnetic field gradient blips to impart a phase shift to echo signals responsive to the RF excitation field such that image data corresponding to the at least one adjacent slice location is shifted by a selected percentage of a field-of-view (FOV) of the current slice location;c) acquiring, with an RF receiver coil image data indicative of the echo signals; andd) reconstructing a plurality of images of the subject from the acquired image data, each of the plurality of images depicting the subject at a ...

CONTROLLING GRADIENT COILS TAKING THE INDUCTIVE COUPLING INTO ACCOUNT

A gradient pulse generator generates reference current signals for a plurality of gradient coils of a gradient coil system of a magnetic resonance system and supplies each of the reference current signals to a controller assigned to one of the gradient coils. Also supplied to the respective controller is an actual current signal that is characteristic of the current flowing in the respective gradient coil. Each of the controllers generates a control signal and accordingly drives a gradient power amplifier assigned to the respective gradient coil. The gradient power amplifiers apply a current to the gradient coils assigned to the gradient power amplifiers in accordance with the generated control signals. Each of the controllers is also supplied with the reference current signal or the actual current signal of at least one other gradient coil or the time derivative of the reference current signal or the actual current signal. 1. A control method for a plurality of gradient coils of a gradient coil system of a magnetic resonance system , the control method comprising:generating reference current signals for the plurality of gradient coils by a gradient pulse generator;supplying each of the reference current signals to a controller assigned to each gradient coil of the plurality of gradient coils;supplying each of the controllers with an actual current signal that is characteristic of the reference current signal flowing in the respective gradient coil;generating, using the controllers, control signals and driving gradient power amplifiers assigned to the plurality of gradient coils in accordance with the generated control signals; andapplying, using the gradient power amplifiers, currents to the plurality of gradient coils assigned to the gradient power amplifiers in accordance with the generated control signals,wherein the controllers are each supplied with the reference current signal or the actual current signal of at least one other gradient coil of the plurality ...

Magnetic resonance imaging apparatus

A magnetic resonance imaging apparatus according to an embodiment includes a controller and an image reconstruction unit. The controller executes a pulse sequence having spare time during the time after transient of a gradient magnetic field for dephasing, applied in a readout direction after a radio frequency (RF) pulse for excitation is applied, until the first RF pulse for refocusing is applied in the case where imaging based on a fast spin echo method is performed. The image reconstruction unit reconstructs an image from magnetic resonance data collected by executing the pulse sequence.

Magnetic resonance imaging apparatus and magnetic resonance imaging method

In one embodiment, an MRI apparatus ( 20 ) includes a reference scan setting unit ( 100 ), a reference scan execution unit, and an image generation unit. The reference scan setting unit calculates a signal acquisition region of “a reference scan in which MR signals used for generation of a sensitivity distribution map of each coil element are acquired”, depending on an imaging region of a main scan of parallel imaging. The reference scan execution unit executes the reference scan on the calculated signal acquisition region. The image generation unit generates image data according to “MR signals acquired by the main scan” and “the sensitivity distribution map generated based on MR signals acquired by the reference scan”.

ACTIVATION OF FIELD COILS OF A MAGNETIC RESONANCE SYSTEM HAVING EDDY CURRENT COMPENSATION

A controller of a magnetic resonance system determines an activation signal vector based on a target field predetermined for the controller in conjunction with field characteristics of field coils known to the controller. The activation signal vector includes a respective activation signal for each field coil. The controller determines the activation signal vector such that within a predetermined examination volume of the magnetic resonance system, any deviation of an ideal field that would result if ideal coils were subjected to the activation signals of the activation signal vector from the target field is minimized. The controller determines a compensation signal vector based on the activation signal vector in conjunction with eddy current characteristics of the field coils known to the controller. The compensation signal vector is used to minimize a deviation of an actual field from the target field within the predetermined examination volume of the magnetic resonance system. 1. An activation method for a plurality of field coils of a magnetic coil system of a magnetic resonance system , the activation method comprising:predetermining a target field by a controller of the magnetic resonance system;determining, using the controller, an activation signal vector based on the predetermined target field in conjunction with field characteristics of the plurality of field coils known to the controller, the activation signal vector including a respective activation signal for each field coil of the plurality of field coils;determining, using the controller, the activation signal vector such that within a predetermined examination volume of the magnetic resonance system, any deviation of an ideal field resulting when ideal coils corresponding ideally to the field characteristics of the plurality of field coils are subjected to the activation signals of the activation signal vector, from the target field is minimized;determining, using the controller, a compensation ...

Method for taking data from a resonance force microscopy probe

A control apparatus for extracting data from an MRFM system in accordance with exemplary embodiments of the present invention comprising a visualization controller for controlling operation of the MRFM system, an initialization module, coupled to the visualization controller, for retrieving initialization data from a data source, a data collection module, coupled to the visualization controller, for extracting data from the MRFM system and an imaging module for generating image data based on the extracted data.

Determination of a Measuring Sequence for a Magnetic Resonance System

A method and a measuring-sequence-determining device for determining a measuring sequence for a magnetic resonance system based on at least one intra-repetition-interval time parameter are provided. During the determination of the measuring sequence in a gradient-optimization method, gradient-pulse parameters of the measuring sequence are automatically optimized to reduce at least one gradient-pulse-parameter maximum value. As a boundary condition in the gradient-optimization method, the intra-repetition-interval time parameter is kept constant at least within a specified tolerance value. 1. A method for determining a measuring sequence for a magnetic resonance system based on at least one intra-repetition-interval time parameter , the method comprising:automatically optimizing, during the determination of the measuring sequence in a gradient-optimization method, gradient-pulse parameters of the measuring sequence in order to reduce at least one gradient-pulse-parameter maximum value,wherein, as a boundary condition in the gradient-optimization method, the intra-repetition-interval time parameter is kept constant at least within a specified tolerance value.2. The method as claimed in claim 1 , wherein the gradient-pulse parameters comprise a slew rate claim 1 , a gradient amplitude of a gradient pulse of the measuring sequence claim 1 , or the slew rate and the gradient amplitude.3. The method as claimed in claim 1 , wherein the measuring sequence comprises an echo sequence claim 1 , and the intra-repetition-interval time parameter comprises an echo time.4. The method as claimed in claim 1 , further comprising optimizing claim 1 , in the gradient-optimization method claim 1 , the at least one gradient-pulse-parameter maximum value.5. The method as claimed in claim 4 , further comprising checking claim 4 , in the gradient-optimization method claim 4 , the at least one gradient-pulse-parameter maximum value in a sequence-determining process claim 4 , to see whether ...

Emission of High Frequency Pulses in a Magnetic Resonance Tomography System

A method for emitting a sequence of high frequency pulses that may have different envelopes in a magnetic resonance tomography system is provided. A digital instruction signal that specifies the envelope for the high frequency pulses that are to be emitted is received. A digital control signal is transmitted to a high frequency unit for generating high frequency pulses, depending on the instruction signal. A test signal that allows notification of a current overload situation is received. The current control signal is reduced if the test signal indicates an overload situation. 1. A method for emitting a sequence of high frequency pulses having different envelopes in a magnetic resonance tomography system , the method comprising:receiving a digital instruction signal that specifies an envelope for a high frequency pulse that is to be emitted;emitting a digital control signal to a high frequency unit for generating the high frequency pulse depending on the digital instruction signal;receiving a test signal that allows notification to be given of a current overload situation; andreducing a current control signal when the test signal indicates the current overload situation.2. The method as claimed in claim 1 , further comprising calculating a standardized overload factor from the test signal claim 1 , the calculating comprising dividing the test signal by a test value at the exceeding where an overload occurs claim 1 , such that a value “1” is assigned to reaching of an overload limit; andreducing the current control signal when the standardized overload factor exceeds the value “1.”3. The method as claimed in claim 2 , wherein the reduction in the current control signal is achieved such that a current digital instruction signal is divided by a current value for the standardized overload factor.4. The method as claimed in claim 2 , further comprising determining a maximum value for the standardized overload factor via at least a first pulse.5. The method as claimed in ...

METHOD AND CONTROL DEVICE TO OPERATE A MAGNETIC RESONANCE SYSTEM

In a method and a control device for operation of a magnetic resonance tomography system to generate image data, multiple of slices in an examination subject are initially excited at a first time interval by a respective RF slice excitation pulse of a series of spatially selective slice excitation pulses. An RF refocusing pulse is then emitted at a second time interval after the first excitation pulse or after the last excitation pulse of the series of RF slice excitation pulses. At least one additional RF refocusing pulse is emitted at a third time interval after a preceding RF refocusing pulse. The third time interval is twice as long as the second time interval. The width of the RF refocusing pulses is selected to generate a number of chronologically separate echo signals per RF refocusing pulse for simultaneous refocusing of all excited slices. 1. A method to operate a magnetic resonance tomography system comprising:exciting nuclear spins in a plurality of slices in an examination subject in said magnetic resonance data acquisition unit at a first time interval by radiating a series of spatially selective RF slice excitation pulses, with each RF slice excitation pulse in said series exciting nuclear spins in a respective slice in said plurality of slices;emitting an RF refocusing pulse in said data acquisition unit at a second time interval after a first RF excitation pulse or after a last RF excitation pulse in said series of spatially selective RF slice excitation pulses, and emitting at least one additional RF refocusing pulse at a third time interval after a preceding RF refocusing pulse; andselecting said third time interval to be twice as long as said second time interval, and selecting a width of each of said RF refocusing pulses so as to generate a plurality of chronologically successive separate echo signals for each RF refocusing pulse, with each RF refocusing pulse being simultaneously effective in multiple excited slices among said plurality of ...

DETERMINATION OF A MAGNETIC RESONANCE SYSTEM CONTROL SEQUENCE

In method and a control sequence determination device to determine a magnetic resonance system control sequence that includes at least one radio-frequency pulse train to be emitted by a magnetic resonance system, a target magnetization (m) is initially detected, and an energy distribution function in k-space is determined on the basis of the target magnetization. A k-space trajectory is then determined under consideration of the energy distribution function in k-space, for which the radio-frequency pulse train is then determined in an RF pulse optimization method. The method is suitable for operation of a magnetic resonance system, and a magnetic resonance system includes such a control sequence determination device. 1. A method control sequence for operating a magnetic resonance system , comprising:operating a magnetic resonance data acquisition unit to detect a target magnetization in an examination subject in the magnetic resonance data acquisition unit;in a processor, automatically determining an energy distribution function in k-space based on the detected target magnetization;in said processor, determining a k-space trajectory in k-space from said energy distribution function in k-space;in said processor, implementing a radio-frequency pulse optimization algorithm to determine a radio-frequency pulse train for said k-space trajectory; andmaking said radio-frequency pulse train available from an output of said processor in an electronic form usable by a sequence controller of said magnetic resonance data acquisition unit to operate said magnetic resonance data acquisition unit to emit radio-frequency pulses according to said radio-frequency pulse train to acquire magnetic resonance data from said examination subject.2. A method as claimed in comprising Fourier transforming said target magnetization to determine said energy distribution function.3. A method as claimed in comprising mean-exempting said target magnetization to determine said energy distribution ...

Determining a Magnetic Resonance System Control Sequence

A method and a control sequence determination device are provided for determining a magnetic resonance control sequence that includes a multichannel pulse train with a number of individual RF pulse trains sent out in parallel by a magnetic resonance system over different independent radio-frequency transmit channels. The multichannel pulse train is calculated based on a predetermined target function with a predetermined target magnetization in an RF pulse optimization method. The RF pulse optimization method takes account of the magnetization in the form of a non-linear equation and of a local radio-frequency load and in a plurality of volume elements in the form of quadratic equation systems. 1. A method for determining a magnetic resonance system control sequence , the magnetic resonance system control sequence comprising a multichannel pulse train with a plurality of individual RF pulse trains to be sent out in parallel by a magnetic resonance system via different independent radio-frequency transmit channels , the method comprising:calculating the multichannel pulse train in an RF pulse optimization based on a predetermined target function with a predetermined target magnetization,wherein the RF pulse optimization takes account of a magnetization in the form of a non-linear Bloch equation and of a local radio-frequency load in a plurality of volume elements in the form of quadratic equation systems.2. The method as claimed in claim 1 , further comprising determining claim 1 , with the RF pulse optimization claim 1 , amplitude and phase of the plurality of RF pulse trains to be sent out in parallel claim 1 , the determining comprising minimizing a sum that is formed from a deviation of an achieved magnetization from the predetermined target magnetization and the local radio-frequency load.3. The method as claimed in claim 1 , wherein an amount of the local radio-frequency load is weighted.4. The method as claimed in claim 1 , wherein a value of the local radio- ...

Controlling Magnetic Resonance Systems

Methods for controlling magnetic resonance systems having a plurality of high frequency transmission channels through which HF pulse trains are emitted in parallel during operation are described. The methods involves specifying a joint reference pulse train for a plurality of the high frequency transmission channels, and determining a transmission scaling factor for each of the high frequency transmission channels in an HF pulse-optimization method by taking into consideration a specified target magnetization to calculate the HF pulse trains for the transmission channels on the basis of the reference pulse train. During calculation of the transmission scaling factors, a target function is created independently of a target magnetization difference in at least a first optimization mode of the HF pulse-optimization method. The target magnetization difference is considered in the HF pulse-optimization method by way of a boundary condition function instead. Pulse optimization devices and magnetic resonance systems are described. 1. A method for controlling a magnetic resonance system , the magnetic resonance system comprising a plurality of high frequency transmission channels through which HF pulse trains are emitted in parallel during operation , the method comprising:specifying a joint reference pulse train for a plurality of the high frequency transmission channels; and wherein, at least in a first optimization mode, a target function is created in the HF pulse-optimization independently of a target magnetization difference during calculation of the transmission scaling factors; and', 'wherein the target magnetization difference is considered in the HF pulse-optimization by way of a boundary condition function instead., 'determining a transmission scaling factor for each of the high frequency transmission channels in an HF pulse-optimization by taking into consideration a specified target magnetization to calculate the HF pulse trains for the transmission channels on ...

MAGNETIC RESONANCE EXAMINATION SYSTEM WITH PREFERRED SETTINGS BASED ON DATA MINING

Provided herein is a system and method for performing a magnetic resonance imaging scan using a MR scanner. The method can comprise receiving via a user interface a MR imaging protocol categorizable into a MR scan type of a predefined set of MR scan types. Further, the method can comprise querying a database by providing to the database scan information permitting the database to identify the MR scan type of the MR imaging protocol. The method can further comprise receiving from the database statistical information on the MR scan type which can include statistics on modifications of individual scan parameters of the MR scan type, and providing the statistical information to the user interface. Modifications of the MR imaging protocol can be received from the user interface, resulting in a modified MR imaging protocol, according to which the MR imaging scan can be performed. 1. A method of performing a magnetic resonance imaging scan using an MR scanner , the method comprising the acts of:{'b': 1', '1, 'receiving an MR imaging protocol via a user interface, the MR imaging protocol being associated with an MR scan type of a predefined set of MR scan types, wherein the MR imaging protocol includes adjustable parameters of the MR scanner () for performing the MR imaging scan using the MR scan type employed at the MR scanner () for performing the MR imaging;'}querying a database by providing scan information to the database, the scan information permitting the database to analyze the MR imaging protocol for identifying the MR scan type of the MR imaging protocol and generating statistical information on the MR scan typereceiving in response to said querying from the database the statistical information on the MR scan type, said statistical information comprising statistics on modifications of individual scan parameters of the adjustable parameters of the MR scan type,providing said statistical information to the user interface,receiving modifications of said MR imaging ...

Controlling Magnetic Resonance Systems

A method for controlling a magnetic resonance system outputs a pulse sequence including a first slice-selective excitation pulse that excites a first slice with a first magnetization. The pulse sequence includes a second slice-selective excitation pulse that excites a second slice with the first magnetization and a third slice-selective excitation pulse that excites the first slice with a second magnetization that cancels the first magnetization. The pulse sequence also includes and a fourth slice-selective excitation pulse that excites the second slice with a magnetization that cancels the first magnetization. The first slice and the second slice intersect. 1. A method for controlling a magnetic resonance system , the method comprising: [ a first slice-selective excitation pulse configured to excite a first slice with a first magnetization;', 'a second slice-selective excitation pulse configured to excite a second slice with a second magnetization, wherein the second magnetization is configured such that the second magnetization has substantially no effect on the first magnetization;', 'a third slice-selective excitation pulse configured to excite the first slice with a third magnetization that substantially cancels the first magnetization; and', 'a fourth slice-selective excitation pulse configured to excite the second slice with a fourth magnetization that substantially cancels the second magnetization; and, 'wherein the pulse sequence comprises, 'wherein the first slice and the second slice intersect., 'outputting a pulse sequence;'}2. The method of claim 1 , wherein each slice-selective excitation pulse of the first slice-selective excitation pulse claim 1 , the second slice-selective excitation pulse claim 1 , the third slice-selective excitation pulse claim 1 , and the fourth slice-selective excitation pulse comprises a high-frequency pulse and a gradient signal claim 1 , wherein a shape of the high-frequency pulse predefines a slice thickness of an excited ...

MAGNETIC RESONANCE IMAGING APPARATUS, AND IMAGING PARAMETER OPTIMIZING METHOD

Disclosed is a technique which allows easy optimization of imaging conditions in imaging using two-dimensional excitation as a pre-pulse. To this end, a parameter which specifies the excitation region of the two-dimensional excitation is shifted, a value (optimum value) when a predefined index is ideal for each application to be applied is decided in a subsequent main imaging sequence, and the optimum value is set to the value of the parameter, whereby optimization is performed. A two-dimensional excitation pre-pulse which is excited under optimum excitation conditions is used to optimize the parameter in the main imaging sequence. 1. A magnetic resonance imaging apparatus comprising:an imaging unit which images a desired region of an inspection target arranged in a static magnetic field by nuclear magnetic resonance; anda control unit which controls the imaging unit in accordance with a predefined imaging sequence and performs an arithmetic process,wherein the control unit includes an excitation condition optimization unit which optimizes excitation conditions of a two-dimensional excitation sequence exciting an imaging space in a columnar shape, andthe imaging unit executes the two-dimensional excitation sequence under the excitation conditions optimized by the excitation condition optimization unit.2. The magnetic resonance imaging apparatus according to claim 1 ,wherein the excitation condition optimization unit excites the imaging space in a cylindrical shape, an elliptic cylindrical shape, or a prismatic shape and optimizes initial excitation conditions for the excitation in accordance with an application to which the two-dimensional excitation sequence is applied.3. The magnetic resonance imaging apparatus according to claim 2 ,wherein the excitation condition optimization unit repeats a monitor scan of the application to be applied while shifting a parameter value to be optimized from among the excitation conditions, and sets an optimum value, which is a ...

Nuclear Magnetic Resonance (NMR) Fingerprinting With Parallel Transmission

Apparatus, methods, and other embodiments associated with NMR fingerprinting with parallel transmission are described. One example apparatus includes individually controllable radio frequency (RF) transmission (TX) coils configured to apply varying NMR fingerprinting RF excitations to a sample. The NMR apparatus may apply excitations in parallel. An individual excitation causes different resonant species to produce different signal evolutions. The apparatus includes a parallel transmission logic that causes one of the coils to apply a first excitation to the sample and that causes a different coil to apply a second, different excitation to the sample. The excitations are configured to produce a spatial inhomogeneity between a first region in the sample and a second region in the sample that allows a resonant species to produce a first signal evolution in the first region and to produce a second signal evolution in the second region to facilitate de-correlating the signal evolutions.

MAGNETIC RESONANCE APPARATUS AND DATA ACQUISITION METHOD WITH DECOUPLING BETWEEN TRANSMIT AND RECEIVE COILS

In magnetic resonance data acquisition, decoupling between the transmit and receive coils is achieved by using a transmit array system wherein induced currents from the transmit coils cancel each other, resulting in a total of zero current in the receive coil. Forward and reversed polarized transmit coil pairs are set to cancel the individual currents of each other, or of a receive coil. Linearly polarized fields can also be used to effect the decoupling. The decoupling allows the magnetic resonance data acquisition system to be operated for concurrent excitation of the nuclear spins and reception of the resulting magnetic resonance signals. 1. A method for acquiring magnetic resonance (MR) data , comprising:operating an MR data acquisition unit, comprising a transmit array and at least one reception coil with an operating sequence in order to acquire MR data from a subject;in said operating sequence, radiating radio-frequency (RF) signals from said transmit array that excite nuclear spins in the subject, thereby causing MR signals to be emitted as a result of the excited nuclear spins, and detecting the MR signals with said at least one reception coil; andoperating said transmit array during said acquisition of said MR signals to cause said transit array to be electromagnetically decoupled from said at least one reception coil during said operation sequence.2. A method as claimed in comprising operating said transmit array to generate linearly polarized fields to produce said decoupling.3. A method as claimed in comprising concurrently emitting said RF signals from said transmit array and detecting said MR signals with said at least one reception coil.4. A method as claimed in comprising claim 1 , in addition to operating said transmit array to electromagnetically decouple said transmit array and said at least one reception coil claim 1 , geometrically decoupling said transmit array and said at least one reception coil.5. A method as claimed in comprising ...

DETERMINATION OF A CONTROL SEQUENCE FOR A MAGNETIC RESONANCE IMAGING SYSTEM

In a method to determine a control sequence for a magnetic resonance imaging system in order to acquire echo signal-based raw magnetic resonance data in k-space along one or more trajectories on the basis of the control sequence, the control sequence is optimized so that, to control a gradient magnetic field for at least a predetermined portion of the control sequence, a change of an attribute of the gradient magnetic field is limited. The limitation takes place so that a momentary amplitude change rate of the gradient magnetic field falls below a predetermined amplitude change rate limit value, and/or so that a momentary direction change rate of the gradient magnetic field falls below a predetermined direction change rate limit value, and/or so that a momentary gradient change rate of the gradient magnetic field that is based on a combination of the momentary amplitude change rate and the momentary direction change rate falls below a predetermined gradient change rate limit value. 1. A method to determine a control sequence for a magnetic resonance imaging apparatus in order to acquire echo signal-based raw magnetic resonance data , comprising:from a processor, controlling entry of said echo signal-based raw magnetic resonance data into an electronic memory representing k-space along at least one trajectory in k-space according to a control sequence;in said processor, automatically optimizing said control sequence to control emission of a gradient magnetic field in said magnetic resonance apparatus during at least a predetermined portion of said control sequence by limiting a change of an attribute of the emitted gradient magnetic field, reduce noise generation during acquisition of said echo signal-based raw magnetic resonance data; andin said processor, limiting said attribute of said gradient magnetic field to achieve a limitation for each trajectory in k-space selected from the group consisting of causing a momentary amplitude change rate of the gradient ...

Systems and methods for landmark correction in magnetic resonance imaging

Systems and methods for landmark correction in Magnetic Resonance Imaging (MRI) are provided. One method includes acquiring at least one calibration image or at least one localizer image of an object, identifying in the calibration or localizer images a region of the object as a reference point, wherein the reference point defines a landmark position. The method further includes determining an offset between an initial landmark position and the identified landmark position. The method also includes using the determined offset for MRI.

APPARATUS AND METHOD FOR MAGNETIC RESONANCE IMAGING

A magnetic resonance imaging apparatus includes: a sequence controlling unit that, by controlling an execution of a pulse sequence, acquires magnetic resonance (MR) signals corresponding to a plurality of channels in the pulse sequence executed as a series, the MR signals being configured to be arranged into a first region of a k-space at first intervals and into a second region larger than the first region at second intervals larger than the first intervals; an arranging unit that arranges the MR signals corresponding to the channels into the k-space as k-space data; and an image generating unit that generates first-interval k-space data corresponding to the channels based on the second-interval k-space data acquired by executing the pulse sequence and generates a magnetic resonance image based on the generated first-interval k-space data, the first-interval k-space data acquired by executing the pulse sequence, and sensitivity distributions corresponding to the channels. 1. A magnetic resonance imaging apparatus comprising:a sequence controlling unit configured to, by controlling an execution of a pulse sequence, acquire magnetic resonance signals corresponding to a plurality of channels in the pulse sequence executed as a series, the magnetic resonance signals being configured to be arranged into a first region of a k-space so as to be positioned at first intervals and into a second region larger than the first region so as to be positioned at second intervals larger than the first intervals;an arranging unit configured to arrange the magnetic resonance signals corresponding to the plurality of channels into the k-space as k-space data; andan image generating unit configured to generate k-space data at the first intervals corresponding to the plurality of channels based on the k-space data at the second intervals acquired by the execution of the pulse sequence and generate a magnetic resonance image based on the generated k-space data at the first intervals, the ...

Controlling a Magnetic Resonance System

A method for controlling a magnetic resonance system is provided. The magnetic resonance system includes a plurality of radio-frequency transmit channels via which, in operation, parallel RF pulse trains are transmitted. The method includes specifying a common reference pulse train for the plurality of the radio-frequency transmit channels. The method also includes, determining, in an RF pulse optimization method, taking into account a prespecified target magnetization, a transmit scaling factor for each of the radio-frequency transmit channels in order to calculate the RF pulse trains for the transmit channels on the basis of the reference pulse train. The transmit scaling factors are optimized taking into account a component-induced Bfield maximum value that is dependent upon the transmit scaling factors. 1. A method for controlling a magnetic resonance system comprising a plurality of radio-frequency transmit channels via which , in operation , parallel RF pulse trains are transmitted , the method comprising:specifying a common reference pulse train for the plurality of radio-frequency transmit channels; anddetermining a transmit scaling factor for each radio-frequency transmit channel of the plurality of radio-frequency transmit channels in an RF pulse optimization method, taking into account a prespecified target magnetization, in order to calculate the parallel RF pulse trains for the plurality of radio-frequency transmit channels on the basis of the specified common reference pulse train,{'sub': '1', 'wherein the transmit scaling factors are optimized taking into account a component-induced Bfield maximum value that is dependent upon the transmit scaling factors.'}2. The method as claimed in claim 1 , wherein the determining comprises creating claim 1 , in the RF pulse optimization method claim 1 , during the determination of the transmit scaling factors claim 1 , at least in a first optimization mode claim 1 , a target function that includes the Bfield ...

Cardiac mri curvilinear tagging

A preparation sequencing system and methods are disclosed for generating curvilinear taglines of altered magnetization in an imaging plane of an NMR image. A preparation sequencing module is disclosed for generating a sinusoidal gradient signal simultaneously with a continuous a radio frequency (RF) signal, wherein the sinusoidal gradient signal is shaped to generate a rotating on-resonance excitation plane such that each point in the imaged target volume is on-resonance at least once in a period corresponding to one full rotation of the excitation plane. The on-resonance excitation plane is configured to simultaneously generate a plurality of curvilinear or circular taglines of altered magnetization in the imaging plane.

Method for Reducing Power Deposition in Magnetic Resonance Imaging Using Multiband Pulses and Multichannel Transmission

A method is provided for substantially simultaneously manipulating spins in a plurality of slice locations using a magnetic resonance imaging [“MRI”) system that includes a radio frequency (“RF”) coil array composed of a plurality of RF coil dements, and in which power deposition, which may be measured as specific absorption rate (“SAR”), is reduce A plurality of slice locations to be substantially simultaneously manipulated with the MRI system are selected, and an RF transmission map (B map) is provided for each of the plurality of RF coil elements. A subset of slice locations to be manipulated by each of the RF coil elements is then selected using the provided RF transmission maps. Using the selected subsets of slice locations, an RF pulse to be transmitted by each of the RF coil elements is designed. The designed RF pulses are then substantially simultaneously transmitted by the MRI system to substantially simultaneously manipulate spins in each o the plurality of slice locations. 1. A method for substantially simultaneously exciting spins in a plurality of slice locations using a magnetic resonance imaging (MRI) system that includes a radio frequency (RF) coil array composed of a plurality of RF coil elements , the steps of the method comprising:a) selecting a plurality of slice locations to be substantially simultaneously manipulated with the MRI system;{'sub': '1', 'sup': '+', 'b) providing an RF transmission (B) map for each of the plurality of RF coil elements in the RF coil array;'}c) identifying those of the plurality of RF coil elements to be used to manipulate respective ones of the plurality of slice locations selected in step a) using the RF transmission maps provided in step b);d) designing an RF pulse to be transmitted by each of the RF coil elements identified in step c); ande) substantially simultaneously transmitting the RF pulses designed in step d) to manipulate spins in each of the plurality of slice locations.2. The method as recited in in ...

Magnetic resonance imaging method

In a magnetic resonance imaging method and apparatus, navigation data are collected in a navigation acquisition timeslot of a scanning sequence. A determination as to whether to accept or reject echo data that are subsequently collected in multiple echo acquisition timeslots is made. If the phase relationship of the navigation data and the reference data in k-space is greater than or equal to the reference value, the collected echo data are accepted and if the aforementioned phase in k-space is less than the reference value, the collected echo data will be rejected, and sequential scanning will be performed again, and the navigation data again will be collected using the navigation acquisition timeslot, and the aforementioned determination is repeated.

Navigator-less segmented diffusion weighted imaging enabled by multiplexed sensitivity-encoded imaging with inherent phase correction

Diffusion weighted imaging (DWI) and diffusion tensor imaging (DTI) using a new technique, termed multiplexed sensitivity encoding with inherent phase correction, is proposed and implemented to effectively and reliably provide high-resolution segmented DWI and DTI, where shot-to-shot phase variations are inherently corrected, with high quality and SNR yet without relying on reference and navigator echoes. The performance and consistency of the new technique in enabling high-quality DWI and DTI are confirmed experimentally in healthy adult volunteers on 3 Tesla MRI systems. This newly developed technique should be broadly applicable in neuroscience investigations of brain structure and function.

RESTRICTION OF THE IMAGING REGION FOR MRI IN AN INHOMOGENEOUS MAGNETIC FIELD

The invention relates to magnetic resonance imaging in the vicinity of a metallic object (like, for instance, a metal implant) where severe spatial perturbations of the static magnetic field occur. In order to suppress the back-folding of distant off-resonant signals into the region of interest, the imaging volume is spatially restricted by means of selection gradients applied concurrently with the excitation and the refocusing RF pulses in a spin echo sequence. The selection gradient applied during the excitation pulse has an amplitude and/or a polarity different from that of the selection gradient applied during the refocusing pulse so that the respectively selected slices in an off-resonance frequency versus spatial coordinate diagram become tilted with respect to one another. The applied imaging technique may of the SEMAC or MAVRIC type and may incorporate compressed sensing, parallel imaging, fat suppression and/or SVD-based noise reduction. 1. A magnetic resonance imaging system comprising:a magnetic resonance imaging system for acquiring magnetic resonance data from a subject, wherein the magnetic resonance data is acquired from an imaging zone;a processor for controlling the medical apparatus; and generate magnetic resonance control commands using a multi-spectral imaging pulse sequence, wherein the pulse sequence selectively encodes magnetic resonance data from a restricted imaging region, wherein the imaging zone comprises the restricted imaging region, wherein the pulse sequence comprises an excitation magnetic field gradient and a refocus magnetic field gradient, wherein the excitation magnetic field gradient and the refocus magnetic field gradient have a different polarity and/or a different magnitude;', 'send the magnetic resonance control commands to the magnetic resonance imaging system;', 'receive the magnetic resonance data from the magnetic resonance imaging system; and', {'b': 106', '1046, 'reconstruct () a magnetic resonance image () of the ...

MAGNETIC RESONANCE IMAGING COORDINATED WITH A PHYSIOLOGICAL CYCLE

To carry out magnetic resonance (MR) tomography, a physiological parameter of an object to be examined is acquired as a function of time to detect a physiological cycle which repeats itself over time. First MR data is acquired for a first region, wherein all points of the first region are arranged in a region of a field of view of an MR system. Acquisition of the first MR data occurs selectively in first time intervals which are synchronized with the physiological cycle and are separated from each other by waiting intervals. Second MR data is acquired for a second region which adjoins the first region. Acquisition of the second MR data occurs in the waiting intervals between the first time intervals. 1. A magnetic resonance (MR) tomography method , comprising:acquiring a physiological parameter of an object to be examined as a function of time to detect a physiological cycle which repeats itself over time;acquiring first MR data for a first region, wherein all points of the first region are arranged in a region of a field of view of an MR system, wherein acquisition of the first MR data occurs selectively in first time intervals synchronized with a physiological cycle and separated from each other by waiting intervals; andacquiring second MR data for a second region, different from the first region, wherein acquisition of the second MR data occurs in the waiting intervals between the first time intervals.2. The method of claim 1 , comprising:adjusting a relative position between the object to be examined and the MR system such that sections of the object to be examined, which move in a coordinated manner with the physiological cycle, are arranged in the first region.3. The method of claim 1 , wherein the second MR data maps low movement sections of the object to be examined.4. The method of claim 1 , wherein acquisition of the second MR data comprises:adjusting a gradient strength of at least one gradient field as a function of an inhomogeneity in a B0 field and a ...

MAGNETIC RESONANCE SYSTEM, AND DEVICE AND METHOD FOR CONTROL THEREOF

In a method for controlling a magnetic resonance system with multiple radio-frequency transmission channels, via which parallel RF pulse trains are emitted in operation, as well as a magnetic resonance system and a pulse optimization device therefor, RF pulse trains respectively include at least one radio-frequency pulse. The RF pulse trains are initially determined so that a minimum Bfield maximum value is not exceeded by the radio-frequency pulse. In an examination subject-specific adjustment step, a current component-dependent Bfield maximum value is then determined, and the radio-frequency pulse is temporally shortened, with its amplitude being increased dependent on the current component-dependent Bfield maximum value. 1. A method for operating a magnetic resonance system comprising multiple radio-frequency (RF) transmission channels , said method comprising:{'sub': '1', 'via the multiple radio-frequency transmission channels, emitting respective RF pulse trains in parallel, each RF pulse train comprising at least one RF pulse that produces a Bfield;'}{'sub': '1', 'in a processor, initially determining said RF pulse trains so that the at least one RF pulse in each of the respective RF pulse trains does not exceed a minimum Bfield maximum value;'}{'sub': '1', 'with an examination subject located in the magnetic resonance system, operating the magnetic resonance system to determine a component-dependent Bfield maximum value; and'}{'sub': '1', 'in the respective RF pulse trains, temporally shortening the respective at least one RF pulse thereof by increasing an amplitude of said at least one RF pulse dependent on said component-dependent Bfield maximum value.'}2. A method as claimed in claim 1 , comprising:in said processor, initially predetermining a common reference pulse train for said multiple RF transmission channels, said common reference pulse train comprising at least one RF pulse;in said processor, executing an optimization algorithm to determine a ...

Device, method and system to control imaging methods and systems

A computer-implemented method for operating an imaging system, includes in a processor, receiving a measurement task, generating a description of the measurement task in the processor from a sequence accessed by the processor, translating the generated description into instructions, and executing the instructions in an imaging installation of the system. An imaging system is configured to execute such a method, and a non-transitory, computer-readable data storage medium is encoded with programming instructions that cause the method to be executed.

Medical imaging apparatus and control method thereof

A medical imaging apparatus operates to automatically recommend protocols suitable for image capture of a subject based on information related to the subject, and a control method operates the medical imaging apparatus. The medical imaging apparatus includes a controller which determines one or more protocols to scan a subject, classifies the protocols based on plural predefined criteria, and aligns and recommends the protocols classified according to a selected criterion if any one of the plural criteria is selected, and a display unit which displays an array of the protocols recommended by the controller.

MAGNETIC RESONANCE METHOD AND APPARATUS FOR AUTOMATIC CALCULATION OF A MAXIMUM PULSE-LENGTH OF AN EXCITATION PULSE

In a method and magnetic resonance apparatus for automatic calculation of a maximum pulse length of a non-selective excitation pulse for a magnetic resonance data acquisition pulse sequence in which gradients are switched during the radiation of at least one non-selective excitation pulse, a first parameter, which indicates the field of view (FOV) desired in the measurement for which the pulse length of the excitation pulse should be maximized, is loaded into a processor, and a second parameter, which indicates the maximum gradient strength (G) which corresponds to the highest gradient strength applied in the entire measurement, is also loaded into the processor. The processor then calculates the maximum pulse length of the excitation pulse on the basis of the first and second parameter. By the maximization of the pulse length, the SAR exposure is reduced for the examination subject from whom the magnetic resonance data are acquired with the pulse sequence. 1. A method for automatically determining a maximum pulse length of a non-selective excitation pulse for a magnetic resonance data acquisition pulse sequence in which gradient magnetic fields are activated during radiation of at least one non-selective excitation pulse , said method comprising:loading a first parameter into a processor that indicates a field of view that is desired in acquisition of magnetic resonance data using said pulse sequence;loading a second parameter into said processor that designates a maximum gradient field strength that corresponds to a maximum gradient field strength applied during an entirety of said magnetic resonance data acquisition;in said processor, automatically calculating a maximum pulse length of said at least one non-selective excitation pulse in said sequence from said first parameter and said second parameter; andmaking the calculated maximum pulse length available in an electronic form for further processing in said processor.2. A method as claimed in comprising ...

MEDICAL IMAGING APPARATUS WITH ILLUMINATION UNIT

A medical imaging apparatus, in particular a magnetic resonance apparatus, has a data acquisition scanner, a patient receiving region, which is surrounded at least partially by the data acquisition scanner, and an illumination unit. The illumination unit has a light-generating unit and a light-emitting unit, and the light-generating unit is situated outside the patient receiving region. 1. A medical imaging apparatus comprising:a medical data acquisition scanner having a patient-receiving region therein that is at least partially surrounded by said medical data acquisition scanner;an illumination unit; andsaid illumination unit comprising a light-generating unit and a light-emitting unit in optical communication with said light-generating unit, said light-generating unit being situated outside of said patient receiving region.2. A medical imaging apparatus as claimed in wherein said light-emitting unit comprises a luminous mesh.3. A medical imaging apparatus as claimed in wherein said luminous mesh comprises at least one side-light fiber.4. A medical imaging apparatus as claimed in wherein said light-emitting unit is situated inside said patient receiving region.5. A medical imaging apparatus as claimed in wherein said light-generating unit comprises at least one light-emitting diode.6. A medical imaging apparatus as claimed in wherein said light-generating unit is situated outside of said medical data acquisition scanner.7. A medical imaging apparatus as claimed in wherein said illumination unit comprises a light transmission unit between said light-emitting unit and said light-generating unit.8. A medical imaging apparatus as claimed in wherein said light transmission unit is formed as one piece with said light-emitting unit.9. A medical imaging apparatus as claimed in wherein said medical data acquisition scanner is a magnetic resonance data acquisition scanner. Field of the InventionThe present invention relates to a medical imaging apparatus with a data ...

MAGNETIC RESONANCE IMAGING APPARATUS AND IMAGE PROCESSING APPARATUS

A magnetic resonance imaging apparatus according to embodiments includes sequence control circuitry and processing circuitry. The sequence control circuitry performs first imaging and second imaging to a subject. The processing circuitry detects a state of a setting of the subject by using a magnetic resonance image acquired from the first imaging, and causes a display to display supporting information that supports the setting of the subject based on information detected. The sequence control circuitry performs the second imaging on the subject after the supporting information is displayed. 1. A magnetic resonance imaging apparatus comprising:sequence control circuitry configured to perform first imaging and second imaging to a subject; andprocessing circuitry configured to detect a state of a setting of the subject by using a magnetic resonance image acquired from the first imaging, and cause a display to display supporting information that supports the setting of the subject based on information detected, whereinthe sequence control circuitry is configured to perform the second imaging on the subject after the supporting information is displayed.2. The magnetic resonance imaging apparatus according to claim 1 , wherein the processing circuitry is configured to detect a feature point of a body part of the subject from the magnetic resonance image acquired from the first imaging claim 1 , and is configured to detect the state of the setting of the subject by using the detected feature point.3. The magnetic resonance imaging apparatus according to claim 2 , wherein the processing circuitry is configured to detect the state of the setting of the subject on a basis of a distance between the feature point detected from the magnetic resonance image acquired from the first imaging and a center of a coil.4. The magnetic resonance imaging apparatus according to claim 3 , whereinthe first imaging and the second imaging are imaging including a knee part of the subject,the ...

PATIENT COUCH WITH FLEXIBLE RF TRANSMITTING POWER DISTRIBUTION FOR A MAGNETIC RESONANCE TOMOGRAPHY SYSTEM

A patient couch for a magnetic resonance tomography system and a magnetic resonance tomography system are provided. The patient couch includes a feed facility for radiofrequency energy having a plurality of conduction paths for feeding radiofrequency energy. The patient couch also includes a plurality of plug-in connectors for local coils having a transmit coil, and a distribution structure for the distribution of radiofrequency energy from the feed facility to the plug-in connectors. 1. A patient couch for a magnetic resonance tomography system , the patient couch comprising:a feed facility for radiofrequency energy, wherein the feed facility has a plurality of conduction paths for feeding radiofrequency energy;a plurality of plug-in connectors for local coils having a transmit coil and a first distribution structure for distribution of radiofrequency energy from the feed facility to the plurality of plug-in connectors, wherein at least one plug-in connector of the plurality of plug-in connectors is arranged in a movable fashion on the patient couch; anda position generator configured to determine a relative position of the at least one movable plug-in connector with respect to the patient couch.2. The patient couch of claim 1 , wherein the first distribution structure connects at least two conduction paths of the plurality of conduction paths of the feed facility electrically to a plug-in connector of the plurality of plug-in connectors for local coils.3. The patient couch of claim 2 , wherein the first distribution structure includes a power coupler configured to combine signals of the at least two conduction paths to form one signal on one signal line.4. The patient couch of claim 2 , wherein the first distribution structure has a plurality of flexible signal lines.5. (canceled)6. (canceled)7. (canceled)8. The patient couch of claim 1 , wherein the feed facility is a first feed facility claim 1 , andwherein the patient couch further comprises a second feed ...

Multi-channel rf transmit system

A multi-channel RF transmit system (1) especially for use in a magnetic resonance examination system comprising, a plurality of RF channels (18, 19) wherein each of the RF channels (18, 19) has an RF amplifier. The multi-channel RF transmit system (1) further comprises a power supply device (2) configured to supply power to the amplifiers (4, 5), a first capacitor bank (6), wherein the first capacitor bank (6) is connected to the power supply device (2) and connected to a first RF amplifier (4), a second capacitor bank (7), wherein the second capacitor bank (7) is connected to the power supply device (2) and connected to a second RF amplifier (5) and a third capacitor bank (8) also connected to the power supply device (2). The third capacitor bank (8) is connected to a DC switch (9), wherein the DC switch (9) is configured to switch the power supplied by the third capacitor bank (8) to the first amplifier (4) or the second amplifier (5). Therefore, a multi-channel RF transmit system (1) is disclosed where parts of the total available capabilities of discrete stored energy can be directed to one or the other RF amplifier channel (18, 19) leading to a more effective and cost saving design of the DC power supply chain.

Anomaly Detection Using Magnetic Resonance Fingerprinting

The invention provides for a medical imaging system comprising: a memory for storing machine executable instructions; a processor for controlling the medical instrument. Execution of the machine executable instructions causes the processor to: receive MRF magnetic resonance data acquired according to an MRF magnetic resonance imaging protocol of a region of interest; reconstruct an MRF vector for each voxel of a set of voxels descriptive of the region of interest using the MRF magnetic resonance data according to the MRF magnetic resonance imaging protocol; calculate a preprocessed MRF vector () for each of the set of voxels by applying a predetermined preprocessing routine to the MRF vector for each voxel, wherein the predetermined preprocessing routine comprises normalizing the preprocessed MRF vector for each voxel; calculate an outlier map for the set of voxels by assigning an outlier score to the preprocessed MRF vector using a machine learning algorithm. 1. A medical imaging system comprising:a memory for storing machine executable instructions; receive MRF magnetic resonance data acquired according to an MRF magnetic resonance imaging protocol of a region of interest;', 'reconstruct an MRF vector for each voxel of a set of voxels descriptive of the region of interest using the MRF magnetic resonance data according to the MRF magnetic resonance imaging protocol;', 'calculate a preprocessed MRF vector for each of the set of voxels by applying a predetermined preprocessing routine to the MRF vector for each voxel, wherein the predetermined preprocessing routine comprises normalizing the preprocessed MRF vector for each voxel; and', 'calculate an outlier map for the set of voxels by assigning an outlier score to the preprocessed MRF vector using a machine learning algorithm., 'a processor for controlling the medical instrument, wherein execution of the machine executable instructions causes the processor to2. The medical imaging system of claim 1 , wherein the ...

MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD

A magnetic resonance imaging apparatus according to an embodiment includes sequence controlling circuitry and processing circuitry. The sequence controlling circuitry acquires first k-space data in units of a plurality of segments while arranging the plurality of segments to overlap one another in a read-out direction, the first k-space being divided into the plurality of segments in the read-out direction. The processing circuitry calculates a weighting coefficient on a basis of information about a gradient magnetic field related to the acquisition and generates second k-space data on a basis of the plurality of segments in the first k-space data and the weighting coefficient. 1. A magnetic resonance imaging apparatus comprising:sequence controlling circuitry configured to acquire first k-space data in units of a plurality of segments while arranging the plurality of segments to overlap one another in a read-out direction, the first k-space being divided into the plurality of segments in the read-out direction;processing circuitry configured to calculate a weighting coefficient on a basis of information about a gradient magnetic field related to the acquisition; and configured to generate second k-space data on a basis of the plurality of segments in the first k-space data and the weighting coefficient.2. The magnetic resonance imaging apparatus according to claim 1 , wherein the processing circuitry is configured to calculate the weighting coefficient on a basis of a waveform of the gradient magnetic field.3. The magnetic resonance imaging apparatus according to claim 1 , wherein the processing circuitry is configured to calculate the weighting coefficient on a basis of an intensity of the gradient magnetic field corresponding to each of a plurality of times.4. The magnetic resonance imaging apparatus according to claim 3 , wherein the processing circuitry is configured to calculate the weighting coefficient on a basis of the intensity of the gradient magnetic ...

MAGNETIC RESONANCE IMAGING APPARATUS

According to one embodiment, a magnetic resonance imaging apparatus includes control circuitry that executes a pulse sequence divided into a plurality of first segments, and in which k-space is filled by radial scanning. In the first segment, a plurality of second segments are executed after application of a first preparation pulse. In the second segment, data acquisition along at least one line in k-space is performed after application of a second preparation pulse. 1. A magnetic resonance imaging apparatus comprising control circuitry that executes a pulse sequence for filling k-space by radial scanning , the pulse sequence being divided into a plurality of first segments , wherein:the control circuitry executes a plurality of second segments after application of a first preparation pulse in each of the first segments; andthe control circuitry executes data acquisition along at least one line in k-space after application of a second preparation pulse in each of the second segments.2. The magnetic resonance imaging apparatus according to claim 1 , wherein the control circuitry applies an inversion pulse as the first preparation pulse.3. The magnetic resonance imaging apparatus according to claim 1 , wherein the control circuitry executes the pulse sequence to acquire data required for reconstructing a single two-dimensional slice in two-dimensional data acquisition or for reconstructing a single three-dimensional volume in three-dimensional data acquisition.4. The magnetic resonance imaging apparatus according to claim 1 , wherein the control circuitry applies a fat saturation pulse as the second preparation pulse.5. The magnetic resonance imaging apparatus according to claim 1 , wherein the control circuitry executes the pulse sequence in which T1 values or T2 values between tissues of a subject are weighted.6. The magnetic resonance imaging apparatus according to claim 1 , further comprising processing circuitry that reconstructs a T1-weighted image or a T2- ...

DETERMINATION OF A FURTHER PROCESSING LOCATION IN MAGNETIC RESONANCE IMAGING

The invention provides for a method of training a neural network () configured for providing a further processing location (). The method comprises providing () a labeled medical image (), wherein the labeled medical image comprises multiple labels each indicating a truth processing location (). The method further comprises inputting () the labeled medical image into the neural network to obtain one trial processing location. The one trial processing location comprises a most likely trial processing location (). The method further comprises determine () the closest truth processing location () for the most likely trial processing location. The method further comprises calculating () an error vector () using the closest truth processing location and the most likely trial processing location. The method further comprises training () the neural network using the error vector. 1. A method of training a neural network configured for providing a further processing location , wherein the method comprises:providing a labeled medical image, wherein the labeled medical image comprises a plurality of labels each indicating a truth processing location;inputting the labeled medical image into the neural network to obtain one trial processing location, wherein the one trial processing location includes a most likely trial processing location;determine the closest truth processing location for the most likely trial processing location, wherein the closest truth processing location is the closest of the truth processing locations to the output of the neural network;calculating an error vector using the closest truth processing location and the most likely trial processing location, wherein the error vector is a position change between the closest truth processing location and the most likely trial processing location, wherein the error vector is calculated only using the closest truth processing location and the most likely trial processing location; andtraining the neural network ...

MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD OF CONTROLLING THE SAME

Even when imaging is aborted, data collected so far is utilized in image reconstruction, thereby enhancing examination efficiency. A certain priority imaging data available for image reconstruction by a fast-imaging method is determined, when collecting k-space data according to a predetermined imaging method. If collection of the certain priority imaging data is completed when imaging is aborted, imaging reconstruction is executed using the priority imaging data. The priority imaging data is determined based on a relationship between the imaging method under execution, and the fast-imaging method underlying determination of the priority imaging data. 1. A magnetic resonance imaging apparatus comprising ,a measuring unit configured to collect k-space data made up of a plurality of nuclear magnetic resonance signals in accordance with a predetermined imaging method,an image generator configured to generate an image using the k-space data collected by the measuring unit, anda control unit configured to control operations of the measuring unit and the image generator, whereinthe control unit includes a priority imaging data determiner configured to determine as priority imaging data, imaging data that is available for image reconstruction according to a fast-imaging method, among the k-space data, and controls a signal acquisition order so that the measuring unit collects the priority imaging data in advance.2. The magnetic resonance imaging apparatus according to claim 1 , whereinthe control unit further includes a status determiner configured to determine a signal acquisition status in the measuring unit, and to allow the image generator to perform image reconstruction using the priority imaging data, when the status determiner determines that the priority imaging data has been collected by the time when the measurement is aborted by the measuring unit.3. The magnetic resonance imaging apparatus according to claim 1 , whereinthe priority imaging data is the k-space ...

Magnetic resonance apparatus and method for operation thereof with an accelerated progression of a repeating pulse sequence with an optimized gradient curve

In a method for an accelerated progression of a repeating pulse sequence with an optimized gradient curve (that has at least one pulse) for a magnetic resonance examination by operation of a magnetic resonance apparatus, boundary conditions for a first gradient pulse of a first progression of the pulse sequence are detected, and the boundary conditions of the first gradient pulse of the first progression of the pulse sequence are compared with boundary conditions of a previous gradient pulse of a previous progression of the pulse sequence. An optimized gradient curve of the first gradient pulse of the first progression of the pulse sequence is determined from the gradient curve of the previous gradient pulse when agreement of the boundary conditions of the first gradient pulse with the boundary conditions of the previous gradient pulse exists.

MAGNETIC RESONANCE IMAGING APPARATUS

There is provided a technique for obtaining temperature information for inside of a living body and accuracy information thereof in short time with low burden imposed on a subject. It is realized with a spectrum calculator configured to perform MRS or MRSI measurement for two kinds of substances showing difference of resonant frequencies and calculating spectra of magnetic resonance signals of the two kinds of substances, a temperature information calculator configured to calculate temperature information for inside of the subject on the basis of peaks of the calculated spectra, a temperature accuracy information calculator configured to calculate temperature accuracy information indicating accuracy of the temperature information on the basis of peaks of the calculated spectra, and a display information generator configured to generate display information to be displayed on a display device on the basis of the temperature information and the temperature accuracy information. 1. A magnetic resonance imaging apparatus comprising a static magnetic field generator configured to generate a static magnetic field in a space in which a subject is placed , a radio frequency magnetic field irradiator configured to irradiate a radio frequency magnetic field on the subject , a gradient magnetic field applicator configured to apply a gradient magnetic field to the subject , a detector configured to detect magnetic resonance signals generated from the subject , a scan controller configured to obtain magnetic resonance signals of two kinds of substances showing difference of resonant frequencies by controlling operations of the gradient magnetic field applicator , the radio frequency magnetic field irradiator , and the detector , an arithmetic unit configured to carry out operational processing of the magnetic resonance signals , and a display device configured to display information obtained by the operational processing , wherein:the arithmetic unit comprisesa spectrum ...

METHOD FOR CONFIGURING A MEDICAL DEVICE

The present disclosure relates to a method for configuring a medical device. The method comprises: providing a set of one or more parameters for configuring the medical device. Each parameter of the set has predefined values. A set of values of the set of parameters may be selected from the predefined values. Using the selected values the set of parameters may be set, which results in an operational configuration of the medical device. The medical device may be controlled to operate in accordance with the operational configuration, thereby an operating status of the medical device may be determined. Based on at least the operating status the operational configuration may be maintained or the selecting, setting and controlling may be repeatedly performed until a desired operating status of the medical device can be determined based on the operating statuses resulting from the controlling. 1. A method for configuring an MRI system , the method comprising:providing a set of one or more parameters for configuring the MRI system, each parameter of the set having predefined values;selecting from the predefined values a set of values of the set of parameters;setting the set of parameters using the selected set of values, resulting in an operational configuration of the medical device;controlling the medical device to operate in accordance with the operational configuration, thereby determining an operating status of the medical device, wherein the steps of selecting, setting and controlling are repeated for multiple patients and wherein the selected set of values is different for different patients;repeatedly performing the selecting, setting and controlling until a desired operating status of the medical device can be determined based on the operating statuses resulting from the controlling and selecting and setting of the set of parameters for multiple patients.2. The method of claim 1 , the controlling of the medical device resulting in output data of the medical device ...

METHODS AND SYSTEMS FOR ESTIMATING TRANSMIT ATTENUATION FOR A MAGNETIC RESONANCE IMAGING SCAN

Various methods and systems are provided for correcting transmit attenuation of an amplifier of a transmit radio frequency (RF) coil for use in a magnetic resonance imaging (MRI) system. In one example, a method includes setting a reference value of transmit attenuation for an amplifier of a transmit radio frequency (RF) coil, acquiring a three-dimensional Bfield map with the transmit attenuation set at the reference value, determining a plurality of mean flip angles for a plurality of slice locations in a pre-scan imaging volume from the Bfield map, determining a transmit attenuation correction value for each of the slice locations based on a prescribed flip angle and the mean flip angle determined for the respective slice location, correcting the reference value of transmit attenuation with the transmit attenuation correction value at each of the slice locations to obtain a final value of transmit attenuation for each of the slice locations, and performing an MRI scan with the transmit attenuation set at the value. 1. A method for a magnetic resonance imaging (MRI) system , comprising:setting a reference value of transmit attenuation for an amplifier of a transmit radio frequency (RF) coil;{'sub': '1', 'acquiring a three-dimensional Bfield map with the transmit attenuation set at the reference value;'}{'sub': '1', 'determining a plurality of mean flip angles for a plurality of slice locations in a pre-scan imaging volume from the Bfield map;'}determining a transmit attenuation correction value for each of the slice locations based on a prescribed flip angle and the mean flip angle determined for the respective slice location;correcting the reference value of transmit attenuation with the transmit attenuation correction value at each of the slice locations to obtain a final value of transmit attenuation for each of the slice locations; andperforming an MRI scan with the transmit attenuation set at the final value.2. The method of claim 1 , wherein acquiring the ...

METHOD FOR RECORDING MEASUREMENT DATA USING A MAGNETIC RESONANCE SYSTEM WITH A CORRECTION OF K-SPACE TRAJECTORIES

In a method for recording measurement data, frequency-dependent parameters characterizing a gradient unit are loaded, a k-space trajectory planned for a MR measurement and having at least one frequency component is loaded, MR measurement data is acquired based on the planned k-space trajectory and reconstructing image data from the MR measurement data, wherein the planned k-space trajectory is corrected based on the at least one frequency component of the planned k-space trajectory and the frequency-dependent parameters, and an electronic signal representing the reconstructed image data is provided as an output of the MR system. The reconstructed image data may be stored and/or displayed. Advantageously, the correction can be employed flexibly for k-space trajectories with different frequency components. 1. A method for recording measurement data using a magnetic resonance (MR) system having a gradient unit , the method comprising:loading frequency-dependent parameters characterizing the gradient unit;loading a k-space trajectory planned for a MR measurement and having at least one frequency component;acquiring MR measurement data based on the planned k-space trajectory and reconstructing image data from the MR measurement data, wherein the planned k-space trajectory is corrected based on the at least one frequency component of the planned k-space trajectory and the frequency-dependent parameters; andproviding an electronic signal representing the reconstructed image data as an output of the MR system.2. The method as claimed in claim 1 , wherein the frequency-dependent parameters characterizing the gradient unit are based on measured gradient impulse response functions (GIRF).3. The method as claimed in claim 1 , wherein the frequency-dependent parameters are loaded at least for one axis of the gradient unit.4. The method as claimed in claim 3 , wherein the correction of the planned k-space trajectory is claim 3 , in each case claim 3 , performed in a direction of ...

Magnetic Resonance Imaging (MRI) Scan Plane Control Device

Example devices, apparatus, and methods concern intervention-independent imaging control for an MRI system. A hand wearable device (e.g., glove) that can be manipulated independently of an interventional device (e.g., catheter) in use to treat a patient transmits position signals describing an orientation of the device to an MRI system. The device may have fiducial markers mounted on an operator's fingers. The MRI system determines a desired scan plane that will correspond to the orientation of the intervention-independent device and performs a diagnostic scan on the desired scan plane. The spatial proximities of the markers may control a switch based control that controls image acquisition parameters including field of view. 1. An intervention-independent device for magnetic resonance imaging control , comprising:a plurality of markers that produce position signals corresponding to positions of members of the plurality of markers, where the position signals describe an orientation of the device, where the position signals are magnetic resonance (MR) signals from which the spatial coordinates of a member of the plurality of markers or the orientation of the device can be determined, where the position signals are sufficient to describe a desired MR scan plane, and where members of the plurality of markers comprise active markers that are responsive to excitation from the MRI magnetic field to produce the position signals;one or more transmitters that transmit the position signals to an MRI system using amplitude modulation or frequency modulation;a wireless reference recovery unit that receives the position signals;an onboard asynchronous reference source that produces a reference signal asynchronous to a synchronization signal associated with the MRI system and produces a carrier frequency to transmit the position signals;a housing that houses the plurality of markers, the one or more transmitters, and the onboard asynchronous reference source, where the housing is ...

SYSTEMS AND METHODS FOR PULSE SEQUENCE CONFIGURATION IN MAGNETIC RESONANCE IMAGING

The present disclosure directs to a system and method for configuring a pulse sequence in MRI. The method may include obtaining a preliminary gradient pulse configuration, wherein the preliminary gradient pulse configuration relates to a portion of a pulse sequence to be implemented by one or more coils of an MR scanner, the pulse sequence including a plurality of gradient pulses. The method may also include determining a global peripheral nerve stimulation (PNS) value of the preliminary gradient pulse configuration according to a PNS model. The method may further include determining a target gradient pulse configuration based at least in part on the preliminary gradient pulse configuration, the global PNS value, and a PNS threshold.

METHOD AND SYSTEM FOR ACTUATION OF A GRADIENT COIL

A method for actuating a gradient coil can include the provision of a target value for a manipulated variable, the output of the manipulated variable according to the target value to the gradient coil, the capture of an actual value of the output manipulated variable, the scaling of the captured actual value taking into consideration a scaling characteristic depending on the target value, and the transformation of the actual value captured in a scaled manner into a digital actual value.

MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD

A magnetic resonance imaging apparatus according to an embodiment includes sequence controlling circuitry and processing circuitry. The sequence controlling circuitry acquires a first piece of data by executing a first pulse sequence having a first Echo Time (TE) value, to acquire a second piece of data by executing a second pulse sequence having a second TE value different from the first TE value, and to acquire a third piece of data by executing a third pulse sequence having a third TE value different from the first and the second TE values. The processing circuitry extracts a signal related to water, a signal related to a first fat, and a signal related to a second fat, on the basis of the first piece of data, the second piece of data, and the third piece of data. 1. A magnetic resonance imaging apparatus comprising:sequence controlling circuitry configured to acquire a first piece of data by executing a first pulse sequence having a first Echo Time (TE) value, to acquire a second piece of data by executing a second pulse sequence having a second TE value different from the first TE value, and to acquire a third piece of data by executing a third pulse sequence having a third TE value different from the first and the second TE values; andprocessing circuitry configured to extract a signal related to water, a signal related to a first fat, and a signal related to a second fat, on a basis of the first piece of data, the second piece of data, and the third piece of data.2. The magnetic resonance imaging apparatus according to claim 1 , wherein the sequence controlling circuitry executes the first pulse sequence claim 1 , the second pulse sequence and the third pulse sequence as a linked one acquisition while maintaining a receiver gain at a same level.3. The magnetic resonance imaging apparatus according to claim 1 , wherein the processing circuitry extracts the signal related to the water claim 1 , the signal related to the first fat claim 1 , and the signal ...

METHOD AND APPARATUS FOR OPTIMIZATION OF A TIME PROGRESSION OF A MAGNETIC RESONANCE CONTROL SEQUENCE

In a method and magnetic resonance (MR) apparatus or optimizing a time progression of an MR control sequence that operates an MR scanner of the MR apparatus so as to execute at least two sequence modules, a property of a component of the magnetic resonance apparatus is detected, and a first requirement of the component is determined for a first sequence module of the at least two sequence modules. A second requirement of the component is detected for a second sequence module of the at least two sequence modules. The time progression of the at least two sequence modules is optimized, taking account of the property, the first requirement and second requirement. 1. A method for optimizing a time progression of a magnetic resonance (MR) control sequence , said method comprising:providing a computer with an MR control sequence with which an MR imaging apparatus, comprising an MR scanner and a plurality of apparatus components, is operable in order to acquire MR data from a subject, said MR control sequence comprising at least two sequence modules;providing said computer with an electronic input designating a property of at least one of said components;in said computer, determining a first requirement of said at least one component, associated with use of said at least one component in said MR imaging apparatus when acquiring said MR data from the patient, for a first sequence module of said at least two sequence modules;in said computer, determining a second requirement of said at least one component, associated with use of said at least one component in said MR imaging apparatus when acquiring said MR data from the patient, for a first sequence module of said at least two sequence modules;in said computer, optimizing a time progression of said at least two sequence modules dependent on said property, said first requirement, and said second requirement, and thereby producing an optimized MR control sequence, and generating electronic control signals corresponding to said ...

METHOD OF EXTRACTING INFORMATION ABOUT A SAMPLE BY NUCLEAR MAGNETIC RESONANCE MEASUREMENTS

According to an aspect of the present inventive concept, there is provided a method of extracting information about a sample, the method comprising: performing a plurality of magnetic resonance measurements on the sample, each measurement including subjecting the sample to an encoding sequence, at least a part of the sequence being adapted to encode a magnetic resonance signal attenuation due to nuclear relaxation and diffusion, wherein at least one parameter of a gradient pulse sequence is varied between at least a subset of said plurality of measurements, and at least one measurement of said subset includes a gradient pulse sequence having a diffusion-encoding tensor representation with more than one non-zero eigenvalue, and wherein at least a subset of said plurality of measurements include encoding for different levels of magnetic resonance signal attenuation due to nuclear relaxation; and extracting information about the sample from signals resulting from said plurality of magnetic resonance measurements, the information including nuclear relaxation and diffusion characteristics for the sample. 1. A method of extracting information about a sample , the method comprising:performing a plurality of magnetic resonance measurements on the sample, each measurement including subjecting the sample to an encoding sequence, at least a part of the sequence being adapted to encode a magnetic resonance signal attenuation due to nuclear relaxation and diffusion,wherein at least one parameter of a gradient pulse sequence is varied between at least a first subset of said plurality of measurements, and at least one measurement of said first subset includes a gradient pulse sequence comprising a diffusion-encoding tensor representation with more than one non-zero eigenvalue,and wherein at least a second subset of said plurality of measurements include encoding for different levels of magnetic resonance signal attenuation due to nuclear relaxation; andextracting information about ...

METHOD AND IMAGING APPARATUS FOR OPTIMIZING A SIGNAL-TO-NOISE RATIO OF A MAGNETIC RESONANCE IMAGE

In a method and apparatus for optimizing the signal-to-noise ratio (SNR) of a magnetic resonance (MR) dataset acquired by means of a magnetic resonance system having at least one transmit coil, a measurement protocol for an acquisition that is to be performed in order to obtain the MR dataset of a predefined measurement volume. A deviation of an actual flip angle from the predefined flip angle in a specific area of the predefined measurement volume is determined for a preset transmitter scaling. The transmitter scaling of the RF pulse is adjusted in order to correct the actual flip angle so that the actual flip angle is approximated to the predefined flip angle in the specific area. The MR dataset is acquired with the adjusted transmitter scaling. 1. A method for optimizing a signal-to-noise ratio (SNR) of a magnetic resonance (MR) dataset , said method comprising:providing a computer with a measurement protocol designed to operate an MR data acquisition scanner, comprising a radio-frequency (RF) transmitter circuit that includes at least one RF transmit coil, in order to acquire RF signals that form said MR dataset, including operating said transmitter circuit to radiate, via said at least one transmit coil, at least one RF pulse having a defined flip angle that gives said RF signals a signal amplitude;in said computer, determining a deviation of an actual flip angle that occurs in a specific area of a defined measurement volume of the subject from which the RE signals are acquired, from a defined flip angle in said specific area produced by a preset transmitter scaling of said at least one RF pulse in said measurement protocol;in said computer, adjusting the transmitter scaling of the at least one RF pulse in said measurement protocol in order to reduce said deviation so as to make said actual flip angle coincide with said defined flip angle as closely as possible, thereby revising the measurement protocol so as to include the adjusted transmitter scaling; ...

AUTOMATIC CONFIGURATION OF A LOW FIELD MAGNETIC RESONANCE IMAGING SYSTEM

In some aspects, a method of operating a magnetic resonance imaging system comprising a Bmagnet and at least one thermal management component configured to transfer heat away from the Bmagnet during operation is provided. The method comprises providing operating power to the Bmagnet, monitoring a temperature of the Bmagnet to determine a current temperature of the Bmagnet, and operating the at least one thermal management component at less than operational capacity in response to an occurrence of at least one event. 1. A portable magnetic resonance imaging (MRI) system , comprising: a B0 magnet configured to provide a B0 field for the portable MRI system; and', 'gradient coils configured to provide gradient fields for the portable MRI system;, 'a plurality of magnetics components configured to produce magnetic fields for performing MRI, the plurality of magnetics components comprisinga power management system comprising one or more power components to provide power to the plurality of magnetics components to operate the portable MRI system to perform image acquisition; and wheels allowing the portable MRI system to be transported to different locations; and', 'a surface configured to support a patient during imaging., 'a housing containing the power management system, the housing comprising2. The portable magnetic resonance imaging system of claim 1 , further comprising a power connection configured to connect to a standard wall outlet.3. The portable magnetic resonance imaging system of claim 1 , wherein the Bmagnet comprises a bi-planar magnet.4. The portable magnetic resonance imaging system of claim 3 , wherein the bi-planar magnet comprises a hybrid magnet.5. The portable magnetic resonance imaging system of claim 1 , wherein:the plurality of magnetics components further comprises one or more radio frequency coils configured to transmit and/or receive magnetic resonance signals; andthe one or more power components comprises one or more amplifiers configured to ...

Control of SAR Values in MR Imaging

In a method for imaging a body part of a patient particularly in relation to DBS where conductive elements can reduce a safe SAR level, the power in the RF pulses being delivered to the RF transmit coil is measured in real time by a unit associated with the FR transmit coil and is used to stop the supply of RF pulses to the RF coil in the event that the power exceeds a predetermined safe limit. As signal can also be transmitted to the MR control unit to shut off the imaging sequence. 1. A method for imaging a body part of a patient comprising:operating an MR magnet with gradient coil of an MR imaging system to generate a variable magnetic field to be applied to the patient;operating an RF transmit coil arrangement of an MR imaging system for supplying RF pulses to an RF transmit coil in a transmit stage to be applied through the RF transmit coil to the patient to be imaged such that the patient generates an MR signal in response to the magnetic field and the RF signal applied;acquiring the MR signal in a receive stage;processing the MR signal by which an image is generated;measuring the power in the RF pulses being delivered to the RF transmit coil in real time;and stopping the supply of RF pulses to the RF coil in the event that the power exceeds a predetermined safe limit.2. The method according to wherein SAR (Watts/kg) being delivered to the patient in real time is measured.3. The method according to wherein the stopping of the RF pulses acts to ensure the safety of a transmit coil which is independent of patient loading and use.4. The method according to wherein the RF pulses are stopped by disconnecting the RF coil.5. The method according to wherein the RF pulses are stopped by supplying a signal to the MR imaging system.6. The method according to wherein the safe limit is determined including parameters of the patient.7. The method according to wherein the power is measured at a measurement unit associated with the RF transmit coil and separate from the MR ...

Patient Bore With Integrated Radiofrequency Return Flux Space

The embodiments relate to a magnetic resonance imaging device, where the cladding of the patient bore of the MR imaging device includes a conductive layer. 1. A magnetic resonance imaging device comprising:a patient bore having cladding, wherein the cladding comprises a conductive layer.2. The magnetic resonance imaging device as claimed in claim 1 , wherein the conductive layer is arranged in claim 1 , or on claim 1 , the cladding claim 1 , andwherein the cladding surrounds the patient bore in a longitudinal direction, the cladding surrounds a circumference of the patient bore, or the cladding surrounds the patient bore in the longitudinal direction and the cladding surrounds the circumference of the patient bore.3. The magnetic resonance imaging device as claimed in claim 1 , wherein the conductive layer extends along a longitudinal direction of the patient bore.4. The magnetic resonance imaging device as claimed in claim 3 , wherein the conductive layer extends along more than 50% of a length of the patient bore in the longitudinal direction.5. The magnetic resonance imaging device as claimed in claim 4 , wherein the conductive layer is arranged in a region of an energy chain of the patient bore claim 4 , wherein the energy chain comprises radiofrequency transmission and reception lines.6. The magnetic resonance imaging device as claimed in claim 4 , wherein the conductive layer is connected in an electrically conductive manner to a system ground point of the magnetic resonance imaging device at a plurality of points.7. The magnetic resonance imaging device as claimed in claim 1 , wherein the conductive layer is arranged in the molded body or glass-fiber reinforced plastic tube of the patient bore.8. The magnetic resonance imaging device as claimed in claim 1 , wherein the conductive layer is arranged in a region of an energy chain of the patient bore claim 1 , wherein the energy chain comprises radiofrequency transmission and reception lines.9. The magnetic ...

MAGNETIC RESONANCE IMAGING APPARATUS

In one embodiment, a magnetic resonance imaging apparatus configured to sequentially execute plural imaging sequences includes: processing circuitry configured to calculate a predicted value of Long MR Examination specific absorbed energy which is an accumulated SAR (Specific Absorption Ratio) value over the plural imaging sequences; and a display configured to display information on the predicted value with respect to a predetermined safety reference value of the Long MR Examination specific absorbed energy.

Magnetic resonance imaging apparatus and imaging planning method

A magnetic resonance imaging apparatus according to an embodiment includes a receiving unit and a determining unit. The receiving unit collectively receives settings of an imaging region on an image of a subject with respect to at least part of imaging protocols in a series of imaging protocols performed in an examination. The determining unit determines the propriety of the setting with respect to each imaging protocol included in the part of the imaging protocols before imaging is started using the part of the imaging protocols.

ELECTRONICALLY CONTROLLABLE GROUPS OF ARTIFICIALLY STRUCTURED UNIT CELLS PROVIDING LOCALIZED B1 MAGNETIC FIELDS FOR MRI AND NMR DEVICES

Described embodiments include a system, apparatus, and method. A system includes an array of at least two groups of at least two artificially structured electromagnetic unit cells. Each group includes a controllable amplifier responsive to a Blocalization control signal and configured to amplify a received pulse of radiofrequency electromagnetic waves. Each group includes an electromagnetic wave conducting structure configured to deliver an amplified pulse of radiofrequency electromagnetic waves to the at least two artificially structured electromagnetic unit cells. The at least two artificially structured electromagnetic unit cells are configured to transform the incident amplified pulse into a pulse of radiofrequency magnetic field Borientated transverse to a segment of the z-axis. A control circuit selects an arbitrary examination segment transverse to the z-axis responsive to data indicative of a transverse slice selected for examination, and generates the Blocalization control signal defining an amplification state assigned to each group. 1. A system comprising:at least two groups of at least two artificially structured electromagnetic unit cells, each group of the at least two groups configured to be sequentially positioned in a respective plane transverse to a z-axis of a bore of a magnetic resonant imaging or a nuclear magnetic resonant device,{'sub': '1', 'each group of at least two groups includes an electronically controllable radiofrequency amplifier switchable between an off-state and an on-state in response to a received Blocalization control signal, and configured in the on-state to amplify a received pulse of radiofrequency electromagnetic waves,'}each group of at least two groups includes a respective radiofrequency electromagnetic wave conducting structure configured to deliver an amplified pulse of radiofrequency electromagnetic waves to the at least two artificially structured electromagnetic unit cells of the group as an incident amplified pulse ...

ARTIFICIALLY STRUCTURED UNIT CELLS PROVIDING LOCALIZED B1 MAGNETIC FIELDS FOR MRI AND NMR DEVICES

Described embodiments include a system, apparatus, and method. An apparatus includes an array of at least two groups of at least two artificially structured electromagnetic unit cells. Each group of the at least two groups configured to be respectively linearly arranged with respect to the z-axis of the bore of MRI or NMR device. Each group of the at least two groups of artificially structured electromagnetic unit cells configured to transform an incident pulse of radiofrequency electromagnetic waves into a pulse of radiofrequency magnetic field Borientated transverse to a segment of the z-axis and spatially proximate to the group. The apparatus includes a radiofrequency electromagnetic wave conducting structure configured to selectably distribute a received pulse of radiofrequency electromagnetic waves to a group of the at least two groups.

LOW FIELD MAGNETIC RESONANCE IMAGING METHODS AND APPARATUS

According to some aspects, a laminate panel is provided. The laminate panel comprises at least one laminate layer including at least one non-conductive layer and at least one conductive layer patterned to form at least a portion of a Bcoil configured to contribute to a Bfield suitable for use in low-field magnetic resonance imaging (MRI). 1. A laminate panel comprising: at least one first laminate layer having patterned thereon an x-gradient coil configured to, when operated, generate or contribute to a magnetic field to provide spatial encoding of emitted magnetic resonance (MR) signals in an x direction;', 'at least one second laminate layer having patterned thereon an y-gradient coil configured to, when operated, generate or contribute to a magnetic field to provide spatial encoding of emitted MR signals in a y direction;', 'at least one third laminate layer having patterned thereon an z-gradient coil configured to, when operated, generate or contribute to a magnetic field to provide spatial encoding of emitted magnetic resonance (MR) in a z direction; and, 'a plurality of laminate layers, each of the plurality of laminate layers including at least one non-conductive layer and at least one conductive layer patterned to form at least a portion of a magnetics component for use in low-field magnetic resonance imaging (MRI), the plurality of laminate layers comprisinga plurality of electrical connections between the plurality of laminate layers consisting of through-hole vias provided through the plurality of laminate layers of the laminate panel.2. The laminate panel of claim 1 , wherein the laminate panel does not include a via provided only through a subset of the plurality of laminate layers.3. The laminate panel of claim 1 , wherein the plurality of layers comprises a top laminate layer claim 1 , a bottom laminate layer claim 1 , and a plurality of intervening laminate layers claim 1 , and wherein the plurality of electrical connections consist of through-hole ...

SYSTEMS AND METHODS FOR WAVEFORM DETERMINATION IN MAGNETIC RESONANCE IMAGING

The present disclosure provides systems and methods for magnetic resonance imaging. The method may include obtaining a pulse sequence for scanning an object, obtaining a tolerance parameter associated with the pulse sequence, determining, based on the pulse sequence and the tolerance parameter, a target waveform for scanning the object, and causing an MRI device to scan the object based on the target waveform. 1. A system for magnetic resonance imaging (MRI) , comprising:at least one storage device storing executable instructions, and obtaining a pulse sequence for scanning an object;', 'obtaining a tolerance parameter associated with the pulse sequence;', 'determining, based on the pulse sequence and the tolerance parameter, a target waveform for scanning the object; and', 'causing an MRI device to scan the object based on the target waveform., 'at least one processor in communication with the at least one storage device, when executing the executable instructions, causing the system to perform operations including2. The system of claim 1 , wherein the pulse sequence includes at least one of a radiofrequency (RF) pulse sequence or a gradient pulse sequence.3. The system of claim 1 , wherein the determining claim 1 , based on the pulse sequence and the tolerance parameter claim 1 , a target waveform for scanning the object includes:determining the target waveform based on a relationship among the pulse sequence, the tolerance parameter, and the target waveform.4. The system of claim 1 , wherein the determining claim 1 , based on the pulse sequence and the tolerance parameter claim 1 , a target waveform for scanning the object includes:querying a waveform database based on the pulse sequence and the tolerance parameter; anddetermining the target waveform based on a query result.5. The system of claim 1 , wherein the determining claim 1 , based on the pulse sequence and the tolerance parameter claim 1 , a target waveform for scanning the object includes:determining, ...

METHOD AND MAGNETIC RESONANCE APPARATUS TO ACQUIRE MR DATA AND TO RECONSTRUCT AN MR IMAGE

In a method to operate a magnetic resonance (MR) system to acquire MR data, an RF excitation pulse is radiated followed by repeated, chronologically sequential implementation of the following steps in order to respectively acquire the MR data of an echo train. A refocusing pulse is radiated, a phase coding gradient is activated, and an additional magnetic field gradient for spatial coding is activated in a direction that is orthogonal to the direction of the phase coding gradient in order to read out the MR data of a k-space line. A k-space line in the k-space center is acquired at a predetermined echo time. A first half of k-space is acquired by entering data into k-space lines of the respective echo train, the data being acquired before the echo time. A second half of k-space is acquired by entering data into k-space lines of the respective echo train, this data having been acquired after the echo time. The k-space lines in the first half of k-space have a first density while the k-space lines in the second half of k-space have a second density that differs from the first density. 1. A method to acquire magnetic resonance (MR) data , comprising:operating an MR data acquisition unit to execute (1) and (2) below multiple times in order to acquire MR data and enter said MR data into a memory organized as k-space, comprising a plurality of k-space lines;(1) radiate a radio-frequency (RF) excitation pulse that excites nuclear spins in an examination subject and causes the excited nuclear spins to produce an echo train;(2) acquire signals, representing MR data, of said echo train by repeatedly and chronologically sequentially operating the MR data acquisition unit to (a) radiate a refocusing pulse, (b) activate a phase coding gradient, and (c) activate an additional magnetic field gradient that spatially encodes said signals in a direction that is orthogonal to a direction of said phase coding gradient and, during activation of said additional magnetic field gradient, ...

Combined Steering Engine and Landmarking Engine for Elbow Auto Align

A method to automatically align magnetic resonance (MR) scans for diagnostic scan planning includes acquiring a three-dimensional (3D) localizer image of an anatomical object. One or more initial landmarks are identified in the 3D localizer image using a landmarking engine. One or more main axes associated with the anatomical object are identified based on the one or more initial landmarks. The 3D localizer image is registered to a canonical space based on the main axes associated to yield a registered 3D localizer image. The landmarking engine is applied to the registered 3D localizer image to yield one or more updated landmarks. A plurality of reference points for performing a MR scan are computed based on the one or more updated landmarks. 1. A method to automatically align magnetic resonance (MR) scans for diagnostic scan planning , comprising:acquiring a three-dimensional (3D) localizer image of an anatomical object;identifying one or more initial landmarks in the 3D localizer image using a landmarking engine;identifying one or more main axes associated with the anatomical object based on the one or more initial landmarks;registering the 3D localizer image to a canonical space based on the main axes associated to yield a registered 3D localizer image;applying the landmarking engine to the registered 3D localizer image to yield one or more updated landmarks; andcomputing a plurality of reference points for performing an MR scan based on the one or more updated landmarks.2. The method of claim 1 , wherein the anatomical object is an elbow and the initial landmarks are each located at the joint of the elbow.3. The method of claim 2 , wherein the initial landmarks identify the medial collateral ligament.4. The method of claim 2 , wherein the initial landmarks identify the lateral collateral ligament.5. The method of claim 2 , wherein the initial landmarks identify identifies the annular ligament.6. The method of claim 2 , wherein at least one of the main axes is ...

GENERATING SETTING PARAMETERS FOR AN MRI SEQUENCE

Techniques are described for generating setting parameters for an MRI sequence to be performed, wherein a conditional generative artificial neural network is used that has been trained as part of a conditional generative adversarial net. The techniques also include establishing a conditional generative artificial neural network. The conditioning of the conditional generative artificial neural network can be used to specify a specific medical application or question to obtain setting parameters for an MRI apparatus that are optimized with respect to said application or question. 1. A system for generating setting parameters for a magnetic resonance imaging (MRI) sequence to be performed in accordance with an MRI scanner , comprising:an input interface configured to receive input data relating to the MRI sequence to be performed; anda conditional generative artificial neural network configured to be trained to generate setting parameters for the MRI sequence to be performed based on the input data received from the input interface relating to the MRI sequence,wherein the conditional generative artificial neural network is conditional so as to generate setting parameters for one T1-weighted MRI sequence, one T2-weighted MRI sequence, and one proton-density-weighted (PD-weighted) MRI sequence.2. The system as claimed in claim 1 , wherein the input data comprises or indicates at least one of the following percentages:a percentage with which the MRI sequence to be performed is to be T1-weighted,a percentage with which the MRI sequence to be performed is to be T2-weighted, anda percentage with which the MRI sequence to be performed is to be PD-weighted.3. The system as claimed in claim 1 ,wherein the setting parameters comprise a repetition time and an echo time for the MRI sequence to be performed.4. The system as claimed in claim 1 ,wherein the setting parameters comprise a turbo factor and/or a bandwidth for the MRI sequence to be performed.5. The system as claimed in ...

METHODS AND APPARATUS FOR PATIENT POSITIONING IN MAGNETIC RESONANCE IMAGING

According to some aspects, a magnetic resonance imaging system capable of imaging a patient is provided. The magnetic resonance imaging system comprising at least one B0 magnet to produce a magnetic field to contribute to a B0 magnetic field for the magnetic resonance imaging system and a member configured to engage with a releasable securing mechanism of a radio frequency coil apparatus, the member attached to the magnetic resonance imaging system at a location so that, when the member is engaged with the releasable securing mechanism of the radio frequency coil apparatus, the radio frequency coil apparatus is secured to the magnetic resonance imaging system substantially within an imaging region of the magnetic resonance imaging system. 1. A magnetic resonance imaging system capable of imaging a patient at least partially supported by a support comprising ferromagnetic material , the magnetic resonance imaging system comprising:{'sub': 0', '0, 'at least one first Bmagnet to produce a first magnetic field to contribute to a Bmagnetic field for the magnetic resonance imaging system;'}{'sub': 0', '0', '0', '0, 'at least one second Bmagnet to produce a second magnetic field to contribute to the Bmagnetic field for the magnetic resonance imaging system, wherein the at least one first Bmagnet and the at least one second Bmagnet are arranged relative to one another so that an imaging region is provided there between; and'}{'sub': 0', '0, 'a member configured to engage with a releasable securing mechanism of a radio frequency coil apparatus, the member attached to the magnetic resonance imaging system between the at least one first Bmagnet and the at least one second Bmagnet at a location so that, when the member is engaged with the releasable securing mechanism of the radio frequency coil apparatus, the radio frequency coil apparatus is secured to the magnetic resonance imaging system substantially within the imaging region.'}2. The magnetic resonance imaging system of ...

DYNAMIC 129Xe GAS EXCHANGE SPECTROSCOPY

Methods and systems with Xe dynamic spectroscopy with a fitting function that includes one or more non-Lorentzians, optionally with a barrier Voigt, and signal processing for identifying cardiogenic oscillations for evaluating disease states, use in drug discovery or monitoring disease status. 1. A method of generating dynamic spectroscopy parameters , comprising:{'sup': 129', '129, 'obtaining a Xe spectrum of free induction decays (FIDs) Xe NMR signal of a gas exchange region of a lung or lungs of a subject during a breathing maneuver comprising one or more of inspiration/inhale, breath-hold or expiration/exhale;'}{'sup': 129', '129, 'fitting the obtained Xe spectrum of the FIDs with a curve fitting function, wherein the Xe spectrum is modeled with one or more non-Lorentzian line shapes; and'}{'sup': 129', '129, 'claim-text': (i) barrier amplitude, barrier chemical shift (ppm), one or more barrier full width at half maximum (FWHM)(ppm) parameters;', '(ii) gas amplitude, gas chemical shift (ppm), gas FWHM (ppm), and gas phase (degrees); and', '(iii) red blood cell (RBC) amplitude, RBC chemical shift (ppm), RBC FWHM (ppm), and RBC phase (degrees)., 'electronically generating a plurality of dynamic Xe spectral parameters based on the fitting, wherein the plurality of dynamic Xe spectral parameters include plots over time of at least one of2. The method of claim 1 , further comprising claim 1 , before the fitting and generating steps claim 1 , extracting temporal variations in Xe RBC resonance occurring at a cardiac frequency.3. The method of claim 1 , wherein the fitting is carried out with a Xe barrier resonance modeled as a Voigt line shape and Xe RBC and Xe gas-phase resonances are each modeled using a Lorentzian line shape claim 1 , and wherein the barrier resonance is characterized by both a Lorentzian FWHM parameter and a Gaussian FWHM (FWHM) (ppm) parameter.4. The method of claim 1 , further comprising adjusting amplitude “A” of the RBC amplitude plot by ...

METHOD AND MAGNETIC RESONANCE APPARATUS FOR OPTIMIZATION OF A SEQUENCE OF MULTIPLE SCAN PROTOCOLS FOR AT LEAST ONE MAGNETIC RESONANCE EXAMINATION

In a method for the optimization of multiple scan protocols for at least one magnetic resonance examination is performed by a magnetic resonance apparatus, patient data for at least one patient are recorded that includes the selection of two or more different measurements, each including at least one scan protocol, which includes at least one magnetic resonance examination. An optimized sequence of the multiple scan protocols for the two or more different measurements for the at least one magnetic resonance examination is determined by a protocol optimization computer. The optimized sequence of the multiple protocols is presented at a display monitor. 1. A method for optimization of a sequence of multiple scan protocols from at least one magnetic resonance examination , comprising:operating a magnetic resonance data acquisition scanner to acquire patient data for a patient in a magnetic resonance examination comprising multiple, different data acquisitions, each data acquisition comprising at least one scan protocol;in a protocol optimization computer, determining an optimized sequence of said multiple scan protocols for said multiple different data acquisitions for said magnetic resonance examination; andat a display monitor in communication with said protocol optimization computer, presenting a display of said optimized sequence of multiple scan protocols.2. A method as claimed in comprising claim 1 , via a control computer of said magnetic resonance data acquisition scanner claim 1 , allowing a user selection of a scan sequence from among said multiple scan protocols presented at said display monitor.3. A method as claimed in comprising claim 1 , in said protocol optimization computer claim 1 , determining said optimized sequence of multiple scan protocols by determining claim 1 , for each of said different data acquisitions claim 1 , determining an expected overall heating of at least one component of said magnetic resonance data acquisition scanner claim 1 , ...

Scan condition determining apparatus and method for a magnetic resonance imaging system

There is provided a scan condition determining apparatus for a magnetic resonance imaging system comprising accepting means for accepting specification of a desired scan time; and searching means for searching for a second scan condition based on a first scan condition defined before the specification, by adjusting values of parameters affecting a scan time or a signal-to-noise ratio of signals obtained by a scan, said second scan condition being one with which the scan time approximates within an allowable range or matches the desired scan time, and besides, a lowest value of a relative signal-to-noise ratio of the signals approximates within an allowable range or matches a lowest value of the relative signal-to-noise ratio of the signals estimated based on the first scan condition. The parameters include, for example, any one of a number of times of addition, a y-axis direction resolution, a repetition time, and a number of data acquisition passes.

LOW FIELD MAGNETIC RESONANCE IMAGING METHODS AND APPARATUS

According to some aspects, a laminate panel is provided. The laminate panel comprises at least one laminate layer including at least one non-conductive layer and at least one conductive layer patterned to form at least a portion of a Bcoil configured to contribute to a Bfield suitable for use in low-field magnetic resonance imaging (MRI). 1. A laminate panel comprising: at least one first laminate layer having patterned thereon an x-gradient coil configured to, when operated, generate or contribute to a magnetic field to provide spatial encoding of emitted magnetic resonance (MR) signals in an x direction;', 'at least one second laminate layer having patterned thereon an y-gradient coil configured to, when operated, generate or contribute to a magnetic field to provide spatial encoding of emitted MR signals in a y direction;', 'at least one third laminate layer having patterned thereon an z-gradient coil configured to, when operated, generate or contribute to a magnetic field to provide spatial encoding of emitted magnetic resonance (MR) in a z direction; and, 'a plurality of laminate layers, each of the plurality of laminate layers including at least one non-conductive layer and at least one conductive layer patterned to form at least a portion of a magnetics component for use in low-field magnetic resonance imaging (MRI), the plurality of laminate layers comprisinga plurality of electrical connections between the plurality of laminate layers consisting of through-hole vias provided through the plurality of laminate layers of the laminate panel.2. The laminate panel of claim 1 , wherein the laminate panel does not include a via provided only through a subset of the plurality of laminate layers.3. The laminate panel of claim 1 , wherein the plurality of layers comprises a top laminate layer claim 1 , a bottom laminate layer claim 1 , and a plurality of intervening laminate layers claim 1 , and wherein the plurality of electrical connections consist of through-hole ...

SHIMMING COILS FOR MAGNETIC RESONANCE IMAGING

A method for operating a magnetic resonance imaging (MRI) system that includes: accessing data indicating a first region for imaging a portion of a subject, the portion being placed in a main magnet of the MRI system and the main magnet generating a magnetic field; selecting, from a group of available shimming coils, a first subset of shimming coils arranged and configured such that, when the shimming coils in the first subset are driven, a homogeneity of the magnetic field at the first region is increased; and driving the shimming coils in the selected first subset of shimming coils without driving other shimming coils in the group of available shimming coils such that the homogeneity of the magnetic field at the first region increases relative to the homogeneity of the magnetic field at the first region when the shimming coils of the selected first subset are not driven. 1. A method for operating a magnetic resonance imaging (MRI) system , the method comprising:accessing data indicating a first region for imaging at least a portion of a subject, the portion being placed in a main magnet of the MRI system and the main magnet generating a substantially uniform magnetic field;based on the accessed data, selecting, by a control unit associated with the MRI system and from a group of available shimming coils, a first subset of shimming coils that are arranged and configured such that, when the shimming coils in the first subset are driven, a homogeneity of the magnetic field at the first region is increased;driving the shimming coils in the selected first subset of shimming coils without driving other shimming coils in the group of available shimming coils by using a group of power amplifiers to provide current, wherein the number of power amplifiers in the group is less than the number of shimming coils in the group of available shimming coils, such that the homogeneity of the magnetic field at the first region increases relative to the homogeneity of the magnetic ...

Preparation of a scan protocol of a medical imaging apparatus

Preparation of a scan protocol of a medical imaging apparatus is provided. A first parameter set that includes one or more first scan parameters is provided. One or more first scan parameter values that are assigned to the one or more first scan parameters are set. Based on these set one or more first scan parameter values, a second parameter set that includes one or more second scan parameters is determined. The second parameter set is provided, and one or more second scan parameter values that are assigned to the one or more second scan parameters are set. Based on the one or more first scan parameter values and/or the one or more second scan parameter values, a scan protocol is prepared. Based on the scan protocol prepared, scan data is acquired by the medical imaging apparatus.

MR FINGERPRINTING HAVING ADJUSTABLE MEASUREMENT TIME

MR fingerprinting method in which an MR pulse sequence succession is output multiple times. The MR pulse sequence succession has MR pulse sequences of a same type output successively in time and differing in terms of a pulse sequence parameter that is varied according to a predefined scheme. During the first output, raw data from a region of interest (ROI) of an object is acquired in a short time interval by the raw data being acquired at a low information density. The total information density of the acquisition is increased with each repetition of the output. After the acquisition, image data from the ROI is reconstructed based on the acquired raw data. MR-parameter value datasets associated with reference image data and having MR parameter values, are determined by comparing the reconstructed image data with the reference image data. MR parameter maps are determined based on the determined MR parameter values. 1. An MR fingerprinting method , comprising:repeatedly outputting an MR pulse sequence succession,wherein the MR pulse sequence succession comprises a plurality of MR pulse sequences of the same type, which are output successively in time and differ in terms of at least one pulse sequence parameter that is varied according to a predefined scheme,wherein during the first output of the MR pulse sequence succession, raw data from a region of interest of an object under examination is acquired in a short time interval by the raw data being acquired at a low information density, andwherein the total information density of the acquisition is increased with each repetition of the output of the MR pulse sequence succession;reconstructing image data from the region of interest on the basis of the acquired raw data;determining MR-parameter value datasets associated with reference image data, which datasets comprise a plurality of MR parameter values, by comparing the reconstructed image data with the reference image data; andproducing a plurality of MR parameter maps ...

LOW FIELD MAGNETIC RESONANCE IMAGING METHODS AND APPARATUS

According to some aspects, a laminate panel is provided. The laminate panel comprises at least one laminate layer including at least one non-conductive layer and at least one conductive layer patterned to form at least a portion of a Bcoil configured to contribute to a Bfield suitable for use in low-field magnetic resonance imaging (MRI). 1. A magnetic resonance imaging (MRI) system , comprising:{'sub': 0', '0, 'a Bmagnet configured to generate a magnetic field to contribute to a Bmagnetic field for the MRI system; and'} a first laminate layer having patterned thereon a gradient coil configured to, when operated, generate or contribute to a magnetic field to provide spatial encoding of emitted magnetic resonance (MR) signals; and', {'sub': '0', 'a second laminate layer having patterned thereon a coil configured to generate a magnetic field to contribute to the Bmagnetic field.'}], 'at least one laminate panel comprising a plurality of laminate layers, the plurality of laminate layers comprising2. The MRI system of claim 1 , wherein the at least one laminate panel comprises a first laminate panel and a second laminate panel claim 1 , and wherein the first laminate panel and the second laminate panel are arranged in a bi-planar configuration.3. The MRI system of claim 1 , where the first laminate layer comprises:at least one laminate layer having patterned thereon an x-gradient coil configured to, when operated, generate or contribute to a magnetic field to provide spatial encoding of emitted magnetic resonance (MR) signals in an x direction;at least one laminate layer having patterned thereon an y-gradient coil configured to, when operated, generate or contribute to a magnetic field to provide spatial encoding of emitted MR signals in a y direction; andat least one laminate layer having patterned thereon an z-gradient coil configured to, when operated, generate or contribute to a magnetic field to provide spatial encoding of emitted magnetic resonance (MR) in a z ...

Method for recording a magnetic resonance image data set, data carrier, computer-program product, and magnetic resonance system

A method for recording a magnetic resonance image data set includes providing a magnetic resonance sequence. The magnetic resonance sequence includes at least one radio-frequency pulse and a slice-selection gradient pulse applied during or before the radio-frequency pulse, which is configured as non-constant. The method includes providing at least one correction term for compensating a magnetic field change of the slice-selection gradient pulse. The magnetic field change is ascertained via a transfer characteristic of the gradient system of the magnetic resonance system. The method also includes recording at least one magnetic resonance image data set with the magnetic resonance sequence using the correction term.

CORRECTION INFLUENCES ON MAGNETIC RESONANCE IMAGING OF AN EXAMINATION OBJECT CAUSED BY FLUCTUATIONS IN A BASIC MAGNETIC FIELD

In a method for correcting influences on magnetic resonance imaging of an examination object caused by fluctuations in a basic magnetic field, an MR data set is generated for two or more measurement periods, and a regression analysis is performed. Each of the MR data sets may contain at least one two-dimensional individual data set. The regression analysis may determine at least one phase correction value for a measurement period to be corrected. Two or more different individual data sets may be taken into account in the analysis. An MR image may generated based on the MR data sets and the at least one phase correction value. 1. A method for correcting influences on magnetic resonance imaging of an examination object caused by fluctuations in a basic magnetic field , whereingenerating, by a magnetic resonance (MR) scanner, respective MR data sets for two or more measurement periods, wherein each of the respective MR data sets contains at least one two-dimensional (2D) individual data set;performing a regression analysis, by a controller, to determine at least one phase correction value for a measurement period to be corrected of the two or more measurement periods, two or more different individual data sets from the MR data sets being taken into account in the regression analysis; andgenerating, by the controller, an MR image is generated based on the respective MR data sets and the at least one phase correction value.2. The method as claimed in claim 1 , wherein the regression analysis is performed as a multivariate regression analysis.3. The method as claimed in claim 1 , wherein the controller is configured to apply a recurrent neural network (RNN) to perform the regression analysis.4. The method as claimed in claim 3 , wherein:a convolutional long short-term memory module is applied for the application of the RNN;at least one convolutional layer followed by a non-convolutional long short-term memory module is applied for the application of the RNN; and/orat ...

CORRECTING FOR HYSTERESIS IN MAGNETIC RESONANCE IMAGING

An apparatus for controlling at least one gradient coil of a magnetic resonance imaging (MRI) system. The apparatus may include at least one computer hardware processor; and at least one computer-readable storage medium storing processor executable instructions that, when executed by the at least one computer hardware processor, cause the at least one computer hardware processor to perform a method. The method may include receiving information specifying at least one target pulse sequence; determining a corrected pulse sequence to control the at least one gradient coil based on the at least one target pulse sequence and a hysteresis model of induced magnetization in the MRI system caused by operation of the at least one gradient coil; and controlling, using the corrected gradient pulse sequence, the at least one gradient coil to generate one or more gradient pulses for imaging a patient. 1. An apparatus for controlling at least one gradient coil of a magnetic resonance imaging (MRI) system , the apparatus comprising:at least one computer hardware processor; and receiving information specifying at least one target pulse sequence;', 'determining a corrected pulse sequence to control the at least one gradient coil based on the at least one target pulse sequence and a hysteresis model of induced magnetization in the MRI system caused by operation of the at least one gradient coil; and', 'controlling, using the corrected pulse sequence, the at least one gradient coil to generate one or more gradient pulses for imaging a patient., 'at least one computer-readable storage medium storing processor executable instructions that, when executed by the at least one computer hardware processor, cause the at least one computer hardware processor to perform a method comprising2. The apparatus of claim 1 , wherein the corrected pulse sequence includes a corrected gradient pulse sequence and controlling the at least one gradient coil comprises driving the at least one gradient coil ...

Automated scan planning for follow-up magnetic resonance imaging

The invention provides for a mri system ( 100 ) for acquiring magnetic resonance data ( 158, 168 ) from a subject. The execution of machine-executable instructions ( 180, 182, 184, 186, 188 ) causes a processor ( 144 ) to: receive ( 300 ) a baseline medical image ( 152 ) data descriptive of one or more internal structures ( 126 ) of the subject; receive ( 302 ) a baseline scan geometry ( 154 ); acquire ( 304 ) survey magnetic resonance data ( 158 ) from the subject by controlling the magnetic resonance imaging system with survey pulse sequence data, wherein the survey pulse sequence data comprises instructions for controlling the magnetic resonance imaging system to acquire magnetic resonance data descriptive of a three-dimensional volume ( 124 ) of the subject; reconstruct ( 306 ) the survey magnetic resonance data into a three-dimensional survey image ( 160 ); calculate ( 308 ) location data by processing the three dimensional survey image with an organ detection algorithm ( 182 ), wherein the location data is descriptive of a target region ( 128 ); assign ( 310 ) a predefined region of interest ( 130 ) to the three dimensional survey image using the location data; calculate ( 312 ) registration data ( 164 ) by registering the baseline medical image to the three dimensional survey image.

MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD FOR SHIMMING OF MAGNETIC RESONANCE IMAGING APPARATUS

Provided is a shimming method performed by a magnetic resonance imaging (MRI) apparatus, the shimming method including applying a magnetic field and a high frequency to an object through a bore of the MRI apparatus including at least one magnet and an RF coil and obtaining a static magnetic field map corresponding to the magnetic field formed in the bore; performing shimming using a plurality of shim channels based on the static magnetic field map; receiving a free induction decay (FID) signal from the RF coil; and determining a state of the magnetic field based on the FID signal and controlling whether to stop shimming based on the determined state. 1. A shimming method performed by a magnetic resonance imaging (MRI) apparatus , the shimming method comprising:applying a magnetic field and a high frequency to an object through a bore of the MRI apparatus comprising at least one magnet and an RF coil and obtaining a static magnetic field map corresponding to the magnetic field formed in the bore;performing shimming using a plurality of shim channels based on the static magnetic field map;receiving a free induction decay (FID) signal from the RF coil; anddetermining a state of the magnetic field based on the FID signal and controlling whether to stop shimming based on the determined state.2. The shimming method of claim 1 , wherein the performing of the shimming comprises:calculating offsets of the plurality of shim channels based on the static magnetic field map; andapplying a current to the plurality of shim channels based on the calculated offsets.3. The shimming method of claim 1 , wherein the controlling whether to stop shimming comprises controlling whether to stop shimming by using a FID signal for each of fat and water received from the RF coil.4. The shimming method of claim 3 , wherein the FID signal for each of fat and water is an FID signal with respect to a specific part of the object.5. The shimming method of claim 3 , wherein the controlling whether to ...

MRI Pulse Sequence Design

A method uses an artificial neural network (ANN) to automatically produce a magnetic resonance (MR) pulse sequence. A first MR signal corresponding to a first tissue and a second MR signal corresponding to a second tissue are identified. An RF pulse to be applied to the first and second tissues is selected. Based on at least the first MR signal, the second MR signal, and the RF pulse, an updated first MR signal and an updated second MR signal are determined. A difference is computed between the updated first MR signal and the updated second MR signal. The difference is added to an accumulated difference. The RF pulse selecting, updated first and second MR signal determination, difference computation and adding are repeated. The ANN is controlled to use reinforcement learning to select the MR imaging pulse sequence based, at least in part, on the accumulated difference. 1. A method for using an artificial neural network (ANN) to automatically produce a magnetic resonance (MR) imaging pulse sequence , the method comprising:(a) identifying a first MR signal corresponding to a first tissue and a second MR signal corresponding to a second tissue,(b) selecting an RF pulse to be applied to the first tissue and the second tissue;(c) based on at least the first MR signal, the second MR signal, and the RF pulse determining an updated first MR signal and an updated second MR signal;(d) computing a difference between the updated first signal and the updated second MR signal;(e) adding the difference to an accumulated difference;(f) repeating steps (b) to (e) one or more times;(g) controlling the ANN to use reinforcement learning to select the MR imaging pulse sequence based, at least in part, on the accumulated difference.2. The method of claim 1 , wherein step (c) includes using a Bloch simulator to compute the updated first MR signal and the updated second MR signal.3. The method of claim 1 , wherein step (g) selects the MR imaging pulse sequence so as to maximize the ...

SUBSEQUENT MRI CONFIGURATION DEPENDENT EDDY CURRENT COMPENSATION

A magnetic resonance imaging system () comprises a magnetic gradient coil system () configured for generating gradient magnetic fields by providing a predetermined temporal electrical current profile to at least one magnetic gradient coil in accordance with a desired magnetic resonance examination mode. An additional device (), which is not part of the original magnetic resonance imaging system () as such, is intended to be positioned within an inner region () of the magnetic resonance imaging system () for special examination or other purposes. The additional device () is capable of generating an eddy current in at least a portion of the additional device () when being exposed to the generated gradient magnetic field. The magnetic resonance imaging system () is configured for modifying the predetermined electrical current profile at least on the basis of at least one predetermined parameter set upon receipt of an information indicative of a presence of at least one additional device () within an inner region () of the magnetic resonance imaging system (); and—a method of operating a magnetic resonance imaging system () with regard to generating a gradient magnetic field by at least one magnetic gradient coil of a gradient coil system () in the presence of at least one additional device (). 1. A magnetic resonance imaging system comprising:a magnetic gradient coil system includingat least one magnetic gradient coil,at least one magnetic gradient coil driver unit for providing a predetermined temporal electrical current profile to the at least one magnetic gradient coil in accordance with a desired magnetic resonance examination mode, and{'b': '48', 'a magnetic gradient coil control unit that is configured for controlling the at least one magnetic gradient coil driver unit ();'}{'sub': '0', 'wherein the magnetic gradient coil system is configured for generating gradient magnetic fields to be superimposed to a static magnetic field Bof the magnetic resonance imaging ...

Method and apparatus for optimization of a pulse sequence for a magnetic resonance system

A method and a pulse sequence optimization device to optimize a pulse sequence for a magnetic resonance system, wherein the pulse sequence includes at least one refocusing pulse, one slice selection gradient pulse, and one gradient spoiler pulse. The pulse duration of the refocusing pulse is shortened, and the pulse duration of the slice selection gradient pulse is adapted to the shortened pulse duration of the refocusing pulse. The amplitude of the slice selection gradient pulse is increased so that the same slice thickness is selected as before the shortening of the pulse duration of the refocusing pulse. The pulse shape of the gradient spoiler pulse is adapted without changing a total spoiler moment, and an optimally shortened pulse duration of the refocusing pulse is achieved when, with the adaptation of the pulse shape of the gradient spoiler pulse, the maximum amplitude of the gradient spoiler pulse equals the amplitude of the slice selection gradient pulse, and an edge steepness of the gradient spoiler pulse is minimized.

MAGNETIC RESONANCE IMAGING SYSTEM AND MAGNETIC RESONANCE IMAGING METHOD

A method of magnetic resonance imaging (MRI) includes applying radio frequency (RF) pulses including a plurality of frequency components and a selection gradient to a target to simultaneously excite a plurality of sub-volumes included in each of a plurality of groups, wherein neighboring sub-volumes of all sub-volumes constituting a volume of the target belong to different groups; acquiring magnetic resonance signals from the plurality of sub-volumes by performing 3D encoding on each of the excited sub-volumes; and reconstructing the acquired magnetic resonance signals into image data corresponding to each of the plurality of sub-volumes. 1. A method of magnetic resonance imaging (MRI) , the MRI method comprising:applying radio frequency (RF) pulses comprising a plurality of frequency components and a selection gradient to a target to simultaneously excite a plurality of sub-volumes included in each of a plurality of groups, wherein neighboring sub-volumes of all sub-volumes constituting a volume of the target belong to different groups;acquiring magnetic resonance signals from the plurality of sub-volumes by performing 3D encoding on each of the excited sub-volumes; andreconstructing the acquired magnetic resonance signals into image data corresponding to each of the plurality of sub-volumes.2. The MRI method of claim 1 , wherein the plurality of groups comprise a first group through an N-th group claim 1 , where N is a natural number that is equal to or greater than two; andthe MRI method further comprises sequentially and iteratively assigning the plurality of sub-volumes to one of the first to N-th groups.3. The MRI method of claim 1 , wherein the acquiring of the magnetic resonance signals from the plurality of sub-volumes by performing 3D encoding on each of the excited sub-volumes comprises applying a first encoding gradient with respect to a first direction and a second encoding gradient with respect to a second direction to each of the excited sub-volumes ...

Two-Channel Magnetic Resonance Imaging

A two-channel magnetic resonance tomography system is provided with a regulation circuit for an amplification system in order to be able to take into account different load situations of the MRI system in a flexible and efficient manner. It is thus possible to improve the MRI measurements greatly if the MRI system is set to the respective load situation beforehand by an idle state measurement. The adaptation may optionally also be carried out during the MRI measurement. Therefore, a multiplicity of completely different load situations may be taken into account in an optimized manner by the regulation circuit. 1. A method for setting an amplification system for a two-channel magnetic resonance imaging system , the method comprising:adapting the amplification system by a control circuit, wherein the amplification system is adapted by the control circuit depending on a load situation.2. The method as claimed in claim 1 , wherein the control circuit has a feedback of an output signal of the amplification system to an input of the amplification system.3. The method as claimed in claim 2 , wherein a delay of the output signal is carried out during the feedback.4. The method as claimed in claim 1 , wherein claim 1 , with the amplification system claim 1 , the load situation is determined and at least one controller of the two-channel magnetic resonance imaging system is set depending on the load situation.5. The method as claimed in claim 4 , wherein the at least one controller comprises a load-dependent feedforward controller for setting an amplification of the amplification system.6. The method as claimed in claim 4 , wherein the at least one controller comprises a further load-dependent controller having four Single Input Single Output (SISO) proportional-integral (PI) controllers.7. The method as claimed in claim 1 , wherein the signals are decoupled upstream of the amplification system.8. The method as claimed in claim 1 , wherein the load situation is determined on ...

NOISE SUPPRESSION METHODS AND APPARATUS

According to some aspects, a method of suppressing noise in an environment of a magnetic resonance imaging system is provided. The method comprising estimating a transfer function based on multiple calibration measurements obtained from the environment by at least one primary coil and at least one auxiliary sensor, respectively, estimating noise present in a magnetic resonance signal received by the at least one primary coil based at least in part on the transfer function, and suppressing noise in the magnetic resonance signal using the noise estimate. 1. A method of suppressing noise in an environment of a magnetic resonance imaging system , the method comprising: obtaining the first plurality of calibration signals using the at least one auxiliary sensor, wherein each of the first plurality of calibration signals comprises multiple values; and', 'obtaining the second plurality of calibration signals using the at least one primary coil, wherein each of the first plurality of calibration signals comprises multiple values;, 'obtaining, using at least one primary coil and at least one auxiliary sensor different from the at least one primary coil, multiple calibration signals comprising a first plurality of calibration signals and a corresponding second plurality of calibration signals byestimating, based on the multiple calibration signals, a transform that, when applied to noise received by the at least one auxiliary sensor, provides an estimate of noise received by the at least one primary coil; and receiving a magnetic resonance signal using the at least one primary coil;', 'receiving a noise signal using the at least one auxiliary sensor;', 'estimating noise present in the magnetic resonance signal received by the at least one primary coil by applying the transform to the noise signal received by the at least one auxiliary sensor to obtain a noise estimate; and', 'suppressing noise in the magnetic resonance signal using the noise estimate., 'after estimating the ...