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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 36. Отображено 32.
22-11-2012 дата публикации

Spatially shaped pre-saturation profile for enhanced non-contrast mra

Номер: US20120293172A1
Автор: Andrew J. Wheaton, Wayne R. Dannels
Принадлежит: Toshiba Corp, Toshiba Medical Systems Corp

A magnetic resonance imaging (MRI) system is used to produce an image representative of the vasculature of a subject by applying a non-contrast MRI pulse sequence to acquire MRI k-space data from non-stationary nuclei flowing in a selected spatial region of a subject after nuclei within the region have been subjected to spatially non-uniform pre-saturation of nuclear magnetic resonance (NMR) magnetization. Such pre-saturation suppresses subsequent MRI signals emanating from background nuclei located within said region during said pre-saturation, while enhancing MRI signal from flowing nuclei therewithin as a function of speed, slice thickness and elapsed time until image capture as a function of the spatially shaped profile of non-uniform pre-saturation across the imaged volume. Thus, acquired MRI k-space data can then be used to reconstruct an image representing vasculature of the subject.

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Номер записи: 1
12-09-2013 дата публикации

Fresh blood imaging (fbi) with independently controlled mri data acquisition parameters for diastolic and systolic mri acquisition sub-sequences

Номер: US20130234707A1
Автор: Andrew J. Wheaton, Mitsue Miyazaki
Принадлежит: Toshiba Corp, Toshiba Medical Systems Corp

A magnetic resonance imaging (MRI) is configured to effect magnetic resonance angiography (MRA) data acquisition sequences including electrocardiogram (ECG) triggered fresh blood imaging (FBI) images respectively associated with systolic and diastolic phases of ECG cycles. An operator input and display interface may be configured to provide operator options for independently controlling at least one imaging sequence parameter to have a different value for each of systolic and diastolic phase images in an FBI MRI data acquisition sequence.

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Номер записи: 2
31-03-2016 дата публикации

MRI GRADIENT TRAJECTORY MAPPING

Номер: US20160091582A1
Автор: THOMPSON Michael R., WHEATON Andrew J.
Принадлежит:

Magnetic field temporal variations in magnetic resonance imaging (MRI) volume are determined based on the slope of a phase difference Δφ between spin responses in plural slices at a given temporal sampling time. Representations of the determined temporal magnetic field variations are stored for subsequent use, e.g., to achieve more accurate re-gridding of acquired k-space date before reconstruction of images in the spatial domain. 1. A magnetic resonance imaging (MRI) system comprising:an assembly of gantry components including static and gradient magnetic field generators and at least one radio frequency (RF) coil defining an imaging volume;an MRI control system, connected to control said gantry components, including at least one RF transmitter, at least one RF receiver and computer control circuits configured to effect specified MRI data acquisition sequences of RF and gradient magnetic pulses which acquire, from an object located within said imaging volume, RF nuclear magnetic resonance (NMR) spin responses emanating from different spatially located volumes of NMR nuclei respectively corresponding to different positions in k-space as a function of a magnetic field experienced by the nuclei; [{'sub': 'i,j', '(A) for each of a series of slices j, a data acquisition sequence using (a) RF and slice select magnetic gradient pulses followed by (b) at least one magnetic gradient pulse, having a same magnitude if more than one and being in a same direction as said slice select magnetic gradient pulse but under a predetermined stress condition, located at least partly within an analog-to-digital converter (ADC) window providing successive temporal samples i of NMR phase responses Φ,'}, '(B) determining magnetic field temporal variations at each sample point i based on the slope of the phase difference ΔΦ between plural slices j at temporal sampling time i, and', '(C) storing representations of the determined temporal magnetic field variations for subsequent use in MRI ...

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Номер записи: 3
02-06-2022 дата публикации

SYSTEM, APPARATUS, AND METHOD FOR INCREMENTAL MOTION CORRECTION IN MAGNETIC RESONANCE IMAGING

Номер: US20220172410A1
Автор: SHARMA Anuj, SHARMA Samir Dev, WHEATON Andrew J.
Принадлежит: Canon Medical Systems Corporation

An apparatus for incremental motion correction in medical imaging. The apparatus for motion correction in magnetic resonance imaging includes processing circuitry configured to estimate an intermediate image from a first section of k-space, the first section of the k-space corresponding to acquisition time points within a magnetic resonance scan of a subject, the corresponding acquisition time points within the magnetic resonance scan being associated with shots of the k-space determined to have minimal motion, estimate motion parameters of a second section of the k-space using the estimated intermediate image, combine data from the first section of the k-space with data from the second section of the k-space according to the estimated motion parameters, and reconstruct the combined data of the k-space to generate a final image. 1. An apparatus for incremental motion correction in magnetic resonance imaging , the apparatus comprising: estimate an intermediate image from a first section of k-space, the first section of the k-space corresponding to acquisition time points within a magnetic resonance scan of a subject, the corresponding acquisition time points within the magnetic resonance scan being associated with shots of the k-space determined to have minimal motion,', 'estimate motion parameters of a second section of the k-space using the estimated intermediate image,', 'combine data from the first section of the k-space with data from the second section of the k-space according to the estimated motion parameters, and', 'reconstruct the combined data of the k-space to generate a final image., 'processing circuitry configured to'}2. The apparatus according to claim 1 , wherein the processing circuitry is further configured toorder N shots of the k-space of the magnetic resonance scan chronologically, andselect, as the first section of the k-space, a first M shots of the ordered N shots of the k-space of the magnetic resonance scan.3. The apparatus according to ...

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Номер записи: 4
23-04-2020 дата публикации

DEVICES, SYSTEMS, AND METHODS FOR MEDICAL IMAGING

Номер: US20200126213A1
Автор: MATAKOS Antonios, WHEATON Andrew J.
Принадлежит: Canon Medical Systems Corporation

Devices, systems, and methods for generating a medical image receive scan data, wherein the scan data is defined in an acquisition space; perform a first reconstruction process to generate a lower-resolution image based on the scan data, wherein the first reconstruction process uses a subset of the scan data; and perform a second reconstruction process to generate a higher-resolution image based on the scan data, wherein the second reconstruction process uses more of the scan data than the subset of the scan data. 1: A method for generating medical images , the method comprising:receiving scan data, wherein the scan data is defined in an acquisition space;performing a first reconstruction process to generate a lower-resolution image based on the scan data, wherein the first reconstruction process uses a subset of the scan data;performing a second reconstruction process to generate a higher-resolution image based on the scan data, wherein the second reconstruction process uses more of the scan data than the subset of the scan data, anddisplaying the lower-resolution image before the higher-resolution image is complete.2: The method of claim 1 , wherein the scan data is magnetic-resonance-imaging data.3: The method of claim 1 , further comprising: displaying the lower-resolution image as a thumbnail image.4: The method of claim 3 , further comprising: setting a scan range of a medical-imaging device based on the thumbnail image.5: The method of claim 3 , further comprising:sending the thumbnail image to a display device of a console of an operator of a medical-imaging device; andsending the higher-resolution image to a medical-image server.6: The method of claim 1 , wherein the second reconstruction process uses all of the scan data.7: The method of claim 1 , wherein the acquisition space is k-space.8: The method of claim 7 , wherein the subset of the scan data is a central part of the k-space.9: The method of claim 1 , wherein the lower-resolution image is defined in ...

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Номер записи: 5
26-05-2016 дата публикации

Magnetic resonance imaging method, magnetic resonance imaging apparatus and magnetic resonance imaging system

Номер: US20160146916A1
Автор: Andrew J. Wheaton
Принадлежит: Toshiba Corp, Toshiba Medical Systems Corp

In one embodiment a magnetic resonance imaging method is disclosed. The method includes the steps of selecting a first RF pulse, selecting a second RF pulse, selecting one of the first RF pulse and the second RF pulse to be spatially selective, with the other being non-spatially selective, selecting a frequency of the first RF pulse to be the same or different than a frequency of the second RF pulse, applying the first RF pulse to excite a first portion of an object, applying the second RF pulse, forming at least one echo in the first portion of the object, obtaining signal data from the first portion of the object in response to the first RF pulse and the second RF pulse and reconstructing the obtained signal data from the first portion to form an image.

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Номер записи: 6
26-05-2016 дата публикации

MAGNETIC RESONANCE IMAGING METHOD AND MAGNETIC RESONANCE IMAGING APPARATUS

Номер: US20160146917A1
Автор: DANNELS Wayne R., WHEATON Andrew J.
Принадлежит:

In one embodiment a magnetic resonance imaging method is disclosed. The method includes the steps of comparing a first image and a second image to determine whether there is a distorted region present in the first image or the second image, each of the first image and second image having a total field of view that is the distance of the image along an axis, assigning an affected field of view to a width of the distorted region, determining an acceleration factor by dividing the total field of view of one or both of the first image and the second image by the affected field of view, acquiring sampled image data according to the acceleration factor of one or both of the first image and the second image and applying a mask to a third image in the affected field of view. 1. A magnetic resonance imaging method comprising:selecting a first set of RF pulses;applying the first set of RF pulses to a portion of an object;generating a first image in response to signal data obtained from the first set of RF pulses;selecting a second set of RF pulses, wherein at least one pulse of the second set of RF pulses has a different gradient than one of the pulses of the first set of RF pulses;applying the second set of RF pulses to the same portion of the object as the first set of RF pulses;generating a second image in response to signal data obtained from the second set of RF pulses;comparing the first image and the second image to determine whether there is a distorted region present in the first image or the second image, each of the first image and the second image having a total field of view that is a distance of the image along an axis;assigning an affected field of view to a width of the distorted region along an axis of one or both of the first image and the second image;determining an acceleration factor by dividing a total field of view of one or both of the first image and the second image by the affected field of view;acquiring sampled image data according to the ...

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Номер записи: 7
21-08-2014 дата публикации

MAPPING EDDY CURRENT FIELDS IN MRI SYSTEM

Номер: US20140232393A1
Автор: DANNELS Wayne R., WHEATON Andrew J.
Принадлежит:

Eddy current fields in a magnetic resonance imaging (MRI) system are mapped by acquiring MRI data from an object located in an imaging volume of the MRI system. An MRI data acquisition sequence is preceded by a pre-sequence including (a) a gradient magnetic field transition that stimulates eddy current fields in the MRI system, and (b) a spatial modulation grid tag module that sensitizes a spatially resolved MR image of the acquired MRI data to the stimulated eddy current fields that existed during the spatial modulation grid tag module. The eddy-sensitized MR image is processed to calculate a spatially resolved map of fields produced by the eddy currents. 1. A method for mapping eddy current fields in a magnetic resonance imaging (MRI) system , said method comprising:using an MRI system to acquire and store MRI data from an object located in an imaging volume of the MRI system using an MRI data acquisition sequence which is preceded by a pre-sequence comprising (a) a gradient magnetic field transition which stimulates eddy current fields in the MRI system, and (b) a spatial modulation grid tag module which sensitizes a spatially resolved MR image of the acquired MRI data to the stimulated eddy current fields which existed during the spatial modulation grid tag module.2. The method as in claim 1 , further comprising:processing said acquired MRI data to generate and store a spatial domain magnitude image of said object having grid lines superimposed thereon as a result of said spatial modulation grid tag, wherein said grid lines exhibit distortion caused by said stimulated eddy current fields not otherwise already compensated by said MRI system.3. The method as in claim 2 , wherein said distortion comprises local dilation or compression of the grid lines and/or local rotation of the grid lines.4. The method as in claim 1 , further comprising processing said acquired MRI data to generate a spatially resolved phase map of the stimulated eddy current fields claim 1 , ...

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Номер записи: 8
25-07-2019 дата публикации

Systems and methods for image artifact reduction in simultaneous multi-slice magnetic resonance imaging

Номер: US20190227140A1
Автор: Andrew J. Wheaton, Anuj Sharma
Принадлежит: Canon Medical Systems Corp

A magnetic resonance imaging system includes an array radiofrequency coil and processing circuitry operatively linked to the array radiofrequency coil and configured to receive output signals from the array radiofrequency coil commensurate with a simultaneous multi-slice magnetic imaging characterized by simultaneous multi-slice parameters, estimate distorted regions of the image volume using either data obtained via a pre-scan or a pre-computed model, minimize overlap of the distorted regions with image voxels representing tissue to obtain optimized values of the simultaneous multi-slice parameters, configuring and executing the simultaneous multi-slice imaging sequence based on the optimized values of the simultaneous multi-slice parameters, and reconstruct simultaneous multi-slice images with minimized artifacts.

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Номер записи: 9
03-09-2020 дата публикации

Method and apparatus for adaptive compressed sensing (cs) to correct motion artifacts in magnetic resonance imaging (mri)

Номер: US20200279413A1
Автор: Andrew J. Wheaton, Antonios MATAKOS
Принадлежит: Canon Medical Systems Corp

An apparatus and method are provided to correct motion artifacts in magnetic resonance imaging (MRI) data by finding and removing motion-corrupted encodes. The MRI data non-uniformly sample k-space using a series of shots, each including one or more encodes. The motion-corrupted encodes/shots are identified by omitting respective encodes/shots from the MRI data when reconstructing respective images using a compressed-sensing (CS) method. The image quality is improved for those reconstructed images in which the motion-corrupted encodes are omitted, whereas all other images include the motion-corrupted encodes and exhibit the motion artifact. Assuming a minority of encodes/shots are corrupted by motion, the images improved by omitting the motion-corrupted encodes can be identified as outliers. Once, the motion-corrupted encodes are identified and excluded from the final MRI dataset, a final, high-resolution image is reconstructed using the final MRI dataset.

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Номер записи: 10
22-10-2020 дата публикации

Readout-segmented echo planar imaging with k-space averaging

Номер: US20200333418A1
Автор: Andrew J. Wheaton, Anuj Sharma
Принадлежит: Canon Medical Systems Corp

An apparatus and method are provided to correct motion artifacts in magnetic resonance imaging (MRI) data by obtaining magnetic resonance imaging (MRI) data, the MRI data including imaging segments and corresponding navigator segments, each imaging segment sampled over a respective regions of two or more regions of a k-space grid, one of the navigator segments being selected as a reference navigator segment; generating, for each imaging segment of the imaging segments, a respective phase map based on the reference navigator segment and a corresponding navigator segment of the each imaging segment; applying the respective phase maps to the corresponding imaging segments to generate corrected imaging segments; averaging the corrected imaging segments in k-space to generate averaged imaging segments; and reconstructing an MRI image based on the averaged imaging segments.

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Номер записи: 11
14-12-2017 дата публикации

QUIET MRI USING ALTERNATING GRADIENT SEQUENCE

Номер: US20170356972A1
Автор: WHEATON Andrew J.
Принадлежит:

Magnetic resonance imaging (MRI) systems and methods to effect MRI data acquisition with reduced noise are described. A readout gradient, having a first polarity used to acquire and store MRI data in k-space memory during analog-to-digital conversion (ADC) of MR RF signals during one TR interval, is continued at substantially a same amplitude and vector direction and used as an image volume selection gradient during a transmitted RF excitation pulse that begins a next TR interval before the readout gradient transitions to an opposite polarity. The acquired k-space data is then used to generate an MR image. 1. A magnetic resonance imaging (MRI) apparatus comprising:static and gradient magnetic field generators and at least one radio frequency (RF) coil disposed within said magnetic field generators;RF transmitter and RF receiver circuits coupled to said at least one RF coil; andat least one MRI sequence control circuit including a k-space memory and at least one processor configured to control said magnetic field generators and said RF transmitter and receiver circuits during execution of an MRI data acquisition sequence including plural successive TR (repetition time) intervals wherein:a readout gradient, having a first polarity used to acquire and store MRI data in k-space memory during analog-to-digital conversion (ADC) of MR RF signals during one TR interval, is continued at substantially a same amplitude and vector direction and used as an image volume selection gradient during a transmitted RF excitation pulse that begins a next TR interval before the readout gradient transitions to an opposite polarity.2. The MRI apparatus as in wherein the amplitude of said readout gradient is incrementally adjusted by less than 5% between ADC portions of TR intervals to acquire MRI data along different radially directed trajectories in k-space during successive TR intervals.3. The MRI apparatus as in wherein ADC acquisition of MRI data within said next TR interval begins ...

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Номер записи: 12
14-12-2017 дата публикации

QUIET MRI WITH SPIN ECHO (SE) OR FAST SPIN ECHO (FSE)

Номер: US20170356973A1
Автор: WHEATON Andrew J.
Принадлежит:

Magnetic resonance imaging (MRI) systems and methods to effect MRI data acquisition with reduced noise in fast spin echo (FSE) and spin echo (SE) implementations are described. The improved MRI data acquisition is performed by acquiring k-space data while maintaining a constant or near constant slice select gradient amplitude throughout a sequence kernel. The acquired k-space data can then be used to generate an MR image. 1. A magnetic resonance imaging (MRI) apparatus comprising:static and gradient magnetic field generators and at least one radio frequency (RF) coil disposed within said magnetic field generators;RF transmitter and RF receiver circuits coupled to said at least one RF coil; andat least one MRI sequence control circuit including a k-space memory and at least one processor configured to control said gradient magnetic field generators and said RF transmitter and receiver circuits during execution of an MRI data acquisition sequence including plural successive TR (repetition time) intervals wherein:{'sub': 'SS', 'TR intervals include at least one instance of a MRI data acquisition sequence kernel for a spin echo (SE) or fast spin echo (FSE) MRI k-space data acquisition sequence of interrelated RF and gradient magnetic field pulses including a slice select gradient magnetic field Gthat remains at a non-zero amplitude throughout said kernel, including data acquisition read-out periods, thereby reducing acoustic noise associated with a slice-select magnetic field axis.'}2. The MRI apparatus as in wherein the amplitude of said slice select gradient magnetic field Gremains sufficiently constant to reduce acoustic noise associated with at least one magnetic gradient coil axis by at least 6 dB compared to acoustic noise generated by an MRI data acquisition sequence wherein Gtransitions to substantially zero amplitude between MR echo data acquisition read out periods.3. The MRI apparatus as in wherein the amplitude of said slice select gradient magnetic field ...

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Номер записи: 13
20-11-2018 дата публикации

Magnetic resonance imaging method, magnetic resonance imaging apparatus and magnetic resonance imaging system

Номер: US10132903B2
Автор: Andrew J Wheaton
Принадлежит: Toshiba Medical Systems Corp

In one embodiment a magnetic resonance imaging method is disclosed. The method includes the steps of selecting a first RF pulse, selecting a second RF pulse, selecting one of the first RF pulse and the second RF pulse to be spatially selective, with the other being non-spatially selective, selecting a frequency of the first RF pulse to be the same or different than a frequency of the second RF pulse, applying the first RF pulse to excite a first portion of an object, applying the second RF pulse, forming at least one echo in the first portion of the object, obtaining signal data from the first portion of the object in response to the first RF pulse and the second RF pulse and reconstructing the obtained signal data from the first portion to form an image.

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Номер записи: 14
03-10-2006 дата публикации

Reduced specific absorption ratio T1ρ-weighted MRI

Номер: US7116104B2
Автор: Andrew J. Wheaton, Ari Borthakur, Ravinder Reddy, Sridhar R. Charagundla
Принадлежит: University of Pennsylvania Penn

Provided is a T 1ρ -weighted pulse sequence with reduced specific absorption rate for magnetic resonance imaging (MRI). Also provided is a method of reducing the specific absorption rate in T 1ρ -weighted MRI.

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Номер записи: 15
18-07-2017 дата публикации

Mapping eddy current fields in MRI system

Номер: US9709653B2
Автор: Andrew J. Wheaton, Wayne R. Dannels
Принадлежит: Toshiba Medical Systems Corp

Eddy current fields in a magnetic resonance imaging (MRI) system are mapped by acquiring MRI data from an object located in an imaging volume of the MRI system. An MRI data acquisition sequence is preceded by a pre-sequence including (a) a gradient magnetic field transition that stimulates eddy current fields in the MRI system, and (b) a spatial modulation grid tag module that sensitizes a spatially resolved MR image of the acquired MRI data to the stimulated eddy current fields that existed during the spatial modulation grid tag module. The eddy-sensitized MR image is processed to calculate a spatially resolved map of fields produced by the eddy currents.

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Номер записи: 16
23-09-2010 дата публикации

B1 mapping in MRI system using k-space spatial frequency domain filtering

Номер: US20100239142A1
Автор: Andrew J. Wheaton, Wayne R. Dannels
Принадлежит: Toshiba Corp, Toshiba Medical Systems Corp

Frequency filtering of spatially modulated or “tagged” MRI data in the spatial frequency k-space domain with subsequent 2DFT to the spatial domain and pixel-by-pixel arithmetic calculations provide robust ratio values that can be subjected to inverse trigonometric functions to derive B1 maps for an MRI system.

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Номер записи: 17
21-07-2020 дата публикации

Devices, systems, and methods for medical imaging

Номер: US10719934B2
Автор: Andrew J. Wheaton, Antonios MATAKOS
Принадлежит: Canon Medical Systems Corp

Devices, systems, and methods for generating a medical image receive scan data, wherein the scan data is defined in an acquisition space; perform a first reconstruction process to generate a lower-resolution image based on the scan data, wherein the first reconstruction process uses a subset of the scan data; and perform a second reconstruction process to generate a higher-resolution image based on the scan data, wherein the second reconstruction process uses more of the scan data than the subset of the scan data.

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Номер записи: 18
06-08-2013 дата публикации

B1 and/or B0 mapping in MRI system using k-space spatial frequency domain filtering with complex pixel by pixel off-resonance phase in the B0 map

Номер: US8502538B2
Автор: Andrew J. Wheaton, Wayne R. Dannels
Принадлежит: Toshiba Corp, Toshiba Medical Systems Corp

Frequency filtering of spatially modulated or “tagged” MRI data in the spatial frequency k-space domain with subsequent 2DFT to the spatial domain and pixel-by-pixel arithmetic calculations provide robust data that can be used to derive B1 and/or B0 maps for an MRI system.

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Номер записи: 19
01-10-2019 дата публикации

Quiet MRI with spin echo (SE) or fast spin echo (FSE)

Номер: US10429463B2
Автор: Andrew J. Wheaton
Принадлежит: Toshiba Medical Systems Corp

Magnetic resonance imaging (MRI) systems and methods to effect MRI data acquisition with reduced noise in fast spin echo (FSE) and spin echo (SE) implementations are described. The improved MRI data acquisition is performed by acquiring k-space data while maintaining a constant or near constant slice select gradient amplitude throughout a sequence kernel. The acquired k-space data can then be used to generate an MR image.

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Номер записи: 20
02-01-2024 дата публикации

System, apparatus, and method for incremental motion correction in magnetic resonance imaging

Номер: US11861766B2
Автор: Andrew J. Wheaton, Anuj Sharma, Samir Dev Sharma
Принадлежит: Canon Medical Systems Corp

An apparatus for incremental motion correction in medical imaging. The apparatus for motion correction in magnetic resonance imaging includes processing circuitry configured to estimate an intermediate image from a first section of k-space, the first section of the k-space corresponding to acquisition time points within a magnetic resonance scan of a subject, the corresponding acquisition time points within the magnetic resonance scan being associated with shots of the k-space determined to have minimal motion, estimate motion parameters of a second section of the k-space using the estimated intermediate image, combine data from the first section of the k-space with data from the second section of the k-space according to the estimated motion parameters, and reconstruct the combined data of the k-space to generate a final image.

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Номер записи: 21
01-08-2019 дата публикации

磁気共鳴イメージングシステム、磁気共鳴イメージング方法、及び磁気共鳴イメージングプログラム

Номер: JP2019126720A
Автор: Andrew J Wheaton, SHARMA Anuj, アンドリュー・ジェイ・ウィートン, シャルマ アヌージ
Принадлежит: Canon Medical Systems Corp

【課題】スライス漏れアーチファクトを低減する。【解決手段】ＭＲＩシステム１００は、アレイＲＦコイル１９と処理部とを有する。処理部は、アレイＲＦコイルと動作可能に接続され、複数の同時マルチスライスパラメータと画像ボリュームとによって特徴付けられた同時マルチスライスＭＲ撮像に相応の出力信号をアレイＲＦコイルから受信し、画像ボリュームにおいて複数の歪み領域を推定し、画像ボリュームにおいて組織を表す複数のボクセルを有する複数の歪み領域の間の重複を最小化することにより、複数の同時マルチスライスパラメータについての複数の最適値を取得し、複数の同時マルチスライスパラメータについての複数の最適値に基づいて同時マルチスライス撮像シーケンスを構成して実行し、同時マルチスライス撮像シーケンスの実行に伴って収集された出力信号に基づいて、アーチファクトが低減された複数の同時マルチスライス画像を再構成する。【選択図】図１

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Номер записи: 22
10-12-2012 дата публикации

磁気共鳴イメージング（ｉｍａｇｉｎｇ）装置及び方法

Номер: JP2012239884A
Автор: Andrew J Wheaton, Wayne R Dannels, アンドリュー・ジェイ・ウィートン, ウエイン・アール・ダネル
Принадлежит: Toshiba Corp, Toshiba Medical Systems Corp

【課題】脈管構造の画像を適切に収集することができる磁気共鳴イメージング装置及び方法を提供することである。 【解決手段】実施形態に係る磁気共鳴イメージング装置は、収集部と、画像再構成部とを備える。収集部は、流体が流入する領域に対して、プロトンの縦磁化成分を飽和させる飽和パルスを空間的に不均一に印加し、該飽和パルスの印加から所定時間経過後、該領域に対して励起パルスを印加することで、該領域から信号を収集する。画像再構成部は、収集された信号を用いて、流体を表す画像を再構成する。 【選択図】図１

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Номер записи: 23
10-07-2023 дата публикации

磁気共鳴イメージング装置、方法及びプログラム

Номер: JP2023098672A
Автор: Andrew J Wheaton, Manak Joseph, Stephens Bradley, アンドリュー・ジェイ・ウィートン, ステフェンス ブラッドレー, マナーク ジョセフ
Принадлежит: Canon Medical Systems Corp

【課題】スキャンシーケンスを適切に分割してハードウェア命令を処理すること。 【解決手段】実施形態に係る磁気共鳴イメージング装置は、処理回路を備える。処理回路は、磁気共鳴スキャンを実施するためのスキャンシーケンスを取得し、前記スキャンシーケンス内で、複数のカーネルの境界を画定する分割時間点を等間隔ではない時間間隔で決定することによって、前記スキャンシーケンスを前記複数のカーネルに分割し、前記複数のカーネルに含まれる１つのカーネルをハードウェア命令に変換し、前記ハードウェア命令を実行用のハードウェア制御部に伝送し、前記ハードウェア命令を実行することによって取得されたデータを含む収集データから磁気共鳴画像を再構成する。 【選択図】図９

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Номер записи: 24
18-11-2021 дата публикации

画像処理装置、画像処理方法、磁気共鳴イメージング装置、および医用画像処理プログラム

Номер: JP2021178165A
Автор: J Wheaton Andrew, SHARMA Anuj, アヌージ・シャルマ, アンドリュー・ジェイ．・ウィートン
Принадлежит: Canon Medical Systems Corp

【課題】ｋ空間におけるスパイクノイズを検出すること。【解決手段】本実施形態に係る画像処理装置は、取得部と、算出部と、分類部とを備える。取得部は、ＭＲＩスキャナによって取得され、強度値を有する複数のデータサンプルを有するオブジェクトのｋ空間データを取得する。算出部は、前記複数のデータサンプルごとに、前記オブジェクトの前記ｋ空間データの原点からの距離値を算出する。分類部は、少なくとも前記データサンプルの前記強度値と前記算出された距離値とに基づいて、前記複数のデータサンプルにおけるデータサンプルがスパイクノイズを表すかどうかの分類を実行する。【選択図】図４

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Номер записи: 25
23-02-2012 дата публикации

Mri using hybrid image

Номер: US20120046541A1
Автор: Andrew J. Wheaton
Принадлежит: Toshiba Corp, Toshiba Medical Systems Corp

Magnetic resonance images (MRI) are generated by acquiring a plurality of N>2 image data sets for an imaged patient volume using respectively corresponding different data acquisition imaging parameters. At least one hybrid image data set X is generated for the imaged patient volume based on a combination of at least a subset of the plurality of image data sets. If desired, a further subtraction image (e.g., MRA) data set is generated based on a difference between the at least one hybrid image data set and another image data set, and the subtraction image data set, which may, depending upon implementation, optimize flowing fluids such as blood within arteries or veins, CSF, etc within the imaged patent volume, is output for storage or display as an MR image of the imaged patient volume.

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Номер записи: 26
01-03-2012 дата публикации

磁気共鳴イメージング装置及び磁気共鳴イメージング方法

Номер: JP2012040369A
Автор: Andrew J Wheaton, アンドリュー・ジェイ・ウィートン
Принадлежит: Toshiba Corp, Toshiba Medical Systems Corp

【課題】流体が適切に描出された画像を収集することができる磁気共鳴イメージング装置及び磁気共鳴イメージング方法を提供すること。 【解決手段】実施形態に係る磁気共鳴イメージング装置は、収集部と、生成部とを備える。前記収集部は、被検体内の流体を撮像し、撮像パルスシーケンスのパラメータが異なる複数の画像を収集する。前記生成部は、画像内の各位置における画素値を、前記複数の画像のうち少なくともひとつの画像から選択し、選択した各位置における画素値を用いてハイブリッド画像を生成する。 【選択図】図１

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Номер записи: 27
19-07-2018 дата публикации

磁気共鳴イメージング装置

Номер: JP2018110848A
Автор: J Wheaton Andrew, R Thompson Michael, アンドリュー・ジェイ．・ウィートン, ミシェル・アール．・トンプソン
Принадлежит: Canon Medical Systems Corp

【課題】画質を向上させることのできる磁気共鳴イメージング装置を提供する。 【解決手段】磁気共鳴イメージング装置は、シーケンス制御部と、算出部とを備える。シーケンス制御部は、複数のＲＦ（Ｒａｄｉｏ Ｆｒｅｑｕｅｎｃｙ）パルスを印加してエコーを生成する第１のパルスシーケンスと、ＲＦパルスを印加してデータ収集を行う第２のパルスシーケンスとを実行する。算出部は、第１のパルスシーケンスにおけるエコーのピーク位置の測定値と、第１のパルスシーケンスにおけるエコーのピーク位置の理論値との時間差を算出し、時間差に基づいて、第２のパルスシーケンスにおけるＲＦパルスの有効励起時間を算出する。 【選択図】図５Ｂ

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Номер записи: 28
22-11-2012 дата публикации

Pulsed asl using tagging pulse pattern encoding/decoding of flowing nuclei cohorts

Номер: US20120293171A1
Автор: Andrew J. Wheaton, Wayne R. Dannels
Принадлежит: Toshiba Corp, Toshiba Medical Systems Corp

Magnetic resonance imaging (MRI) produces an image representative of flowing nuclei within a subject. For each of plural MRI data acquisition sequences, a non-contrast pulsed ASL (arterial spin labeling) pre-sequence is applied to flowing nuclei in a tagging region during a tagging period (that occurs prior to MRI data acquisition from a selected downstream image region). The ASL pre-sequence includes plural different elapsed tagging times at which a radio frequency (RF) nuclear magnetic resonant (NMR) nutation tagging pulse occurs or does not occur in accordance with different predetermined patterns for corresponding different data acquisition sequences. Acquired MRI data is decoded in accordance with such predetermined patterns to detect MRI signals emanating from different cohorts of flowing nuclei that have been subjected to different combinations of nutation pulses. Acquired MRI data is used to reconstruct at least one image representing flowing nuclei within the selected image region.

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Номер записи: 29
23-05-2019 дата публикации

磁気共鳴イメージングシステム、方法及びプログラム

Номер: JP2019076728A
Автор: Andrew J Wheaton, アンドリュー・ジェイ・ウィートン
Принадлежит: Canon Medical Systems Corp

【課題】効率的なパルスシーケンスを実施すること。【解決手段】実施形態に係る磁気共鳴イメージングシステムは、複数のスライスを励起するための多周波数帯域ＲＦパルスの印加と前記多周波数帯域ＲＦパルスに対応するスライス選択傾斜磁場の印加とを含むパルスシーケンスを実行するシーケンス制御部と、前記パルスシーケンスの実行により発生されたエコー信号を受信してエコー信号データを生成する受信部と、前記エコー信号データに基づいて前記複数のスライスに対応する複数の画像を生成する生成部と、を具備し、前記パルスシーケンスは、前記多周波数帯域ＲＦパルスの時間中心に対して前記スライス選択傾斜磁場の時間中心が異なるように設定される。【選択図】 図１

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Номер записи: 30
15-05-2018 дата публикации

MRI gradient trajectory mapping

Номер: US09971008B2
Автор: Andrew J. Wheaton, Michael R. Thompson
Принадлежит: Toshiba Medical Systems Corp

Magnetic field temporal variations in magnetic resonance imaging (MRI) volume are determined based on the slope of a phase difference Δφ between spin responses in plural slices at a given temporal sampling time. Representations of the determined temporal magnetic field variations are stored for subsequent use, e.g., to achieve more accurate re-gridding of acquired k-space date before reconstruction of images in the spatial domain.

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Номер записи: 31
12-12-2017 дата публикации

Magnetic resonance imaging method and magnetic resonance imaging apparatus

Номер: US09841483B2
Автор: Andrew J. Wheaton, Wayne R. Dannels
Принадлежит: Toshiba Medical Systems Corp

In one embodiment a magnetic resonance imaging method includes the steps of comparing a first image and a second image to determine whether there is a distorted region present in the first image or the second image, each of the first image and second image having a total field of view that is the distance of the image along an axis, assigning an affected field of view to a width of the distorted region, determining an acceleration factor by dividing the total field of view of one or both of the first image and the second image by the affected field of view, acquiring sampled image data according to the acceleration factor of one or both of the first image and the second image and applying a mask to a third image in the affected field of view.

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Номер записи: 32