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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 20038. Отображено 100.
05-01-2012 дата публикации

Transformer assembly for a magnetic resonance imaging system

Номер: US20120001715A1
Автор: Aleksey Zemskov, Fraser Robb, Miguel Navarro, Victor Taracila, Vijayanand Alagappan
Принадлежит: General Electric Co

A transformer assembly includes a substrate having a first surface and an opposing second surface, a first spiral wound inductive coil formed on the first surface, a second spiral wound inductive coil formed on the first surface, and a third spiral wound inductive coil formed on the first surface, the first, second and third spiral wound inductive coils forming a triple spiral arrangement on the first surface such that the first coil is inductively coupled to the second coil and the third coil. An RF coil including the transformer assembly and a method of fabricating the transformer assembly are also described.

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Номер записи: 1
02-02-2012 дата публикации

High-current cable connection for gradient cables of a magnetic resonance tomography system

Номер: US20120025831A1
Автор: Peter Obermann
Принадлежит: SIEMENS AG

The present embodiments relate to a method and gradient cable connection for a magnetic resonance tomography system. The gradient cable connection connects cable shoes of two gradient cables to one another. A first fastening device is provided with two nuts. Using the first fastening device, the cable shoes are pressed against one another by the two nuts, the two nuts being disposed on a bolt on opposing sides of the cable shoes. A second fastening device is also provided. Using the second fastening device, the bolt is pressed against a support plate by the bolt and one of the two nuts.

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Номер записи: 2
08-03-2012 дата публикации

Hybrid MR/PET Scanner With Patient Table Split Cable Feed

Номер: US20120059242A1
Автор: Elmar Rummert, James Frank Caruba, Ralf Ladebeck
Принадлежит: SIEMENS AG, Siemens Medical Solutions USA Inc

A hybrid magnetic resonance (MR) and positron emission tomography (PET) imaging system reduces likelihood of artifact distortion in PET images attributable to MR local coil cables and connectors in the patient table. MR local coil cables coupling the MR scanner and the MR local coil connectors are oriented so that they are outside the scanner field of view when performing PET scans.

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Номер записи: 3
15-03-2012 дата публикации

Magnetic Module

Номер: US20120065073A1
Автор: Eamonn Maher, Ian Leitch Mcdougall
Принадлежит: 3 CS Ltd

A magnetic field source is provided comprising a support structure upon which is positioned a conducting surface path of superconductor material. The support structure has an at least partially radially overlapping layer of material arranged in a spiral. A corresponding conducting surface path of superconductor material is arranged on the surface of the support structure such that the conducting path has a first point for the introduction of current and a second point for the extraction of current.

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Номер записи: 4
22-03-2012 дата публикации

Magnetic resonance method and system to generate mr image data with parallel slice excitation

Номер: US20120068704A1
Автор: Stefan Popescu
Принадлежит: Individual

In a method and a magnetic resonance (MR) system and method to generate MR image data of a predetermined volume segment within an examination subject, multiple slices of the volume segment are simultaneously excited by at least one RF excitation pulse, and during the excitation a slice selection gradient is switched. The measurement signals from the multiple slices are acquired with multiple RF reception antennas, at least some of which are spaced along the propagation direction of the slice selection gradient. During the acquisition of the measurement signals the slice selection gradient is switched in order to achieve a spectral separation of the measurement signals of different slices. The MR image data are generated from the measurement signals.

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Номер записи: 5
22-03-2012 дата публикации

Gradient Coil Sub-Assemblies

Номер: US20120068708A1
Автор: Allen Raymond Camp
Принадлежит: Tesla Engineering Ltd

An MRIS gradient coil sub-assembly comprising a first coil layer comprising a first conducting coil portion, a second coil layer comprising a second conductive coil portion electrically connected with the first conductive coil portion so that the first and second conductive coil portions act together as one winding, and a B-stage material consolidation layer sandwiched between the first and second coil layers.

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Номер записи: 6
22-03-2012 дата публикации

Method for affixing a magnetic resonance rf coil to a patient

Номер: US20120071750A1
Автор: Jan Bollenbeck, Wolfgang Renz
Принадлежит: SIEMENS AG

In a method to affix RF coils (in particular local coils) on a patient in examinations with a magnetic resonance apparatus, a horizontal board accommodates the patient for a magnetic resonance examination to be implemented, an RF coil that has coil electronics is affixed with a fastening strap on the patient, and the fastening strap has a connection cable integrated therewith. The coil electronics are supplied with energy via the integrated connection cable.

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Номер записи: 7
29-03-2012 дата публикации

MRI Coil Design

Номер: US20120074935A1
Автор: Bing Keong Li, Ewald Weber, Feng Liu, Stuart Crozier
Принадлежит: Individual

A coil for a magnetic resonance imaging device consists of multiple coil elements arranged about an imaging space. Each coil element comprise radiating structures oriented at an angle to a tangent of the imaging space. Angling the radiating structures reduces mutual coupling between coil elements and enhances the penetration of the radio frequency field to the imaging space.

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Номер записи: 8
29-03-2012 дата публикации

Hollow cylindrical thermal shield for a tubular cryogenically cooled superconducting magnet

Номер: US20120075045A1
Автор: Simon James Calvert
Принадлежит: Siemens PLC

A hollow cylindrical thermal shield for a tubular cryogenically cooled superconducting magnet, has a first axis, an inner cylindrical tube having an axis aligned with the first axis, an outer cylindrical tube of greater diameter than the diameter of the inner cylindrical tube, having an axis aligned with the first axis, and annular end pieces, joining the inner cylindrical tube and the outer cylindrical tube to form an enclosure. The hollow cylindrical thermal shield further has a cylindrical stiffener, extending axially at least part of the axial length of the inner cylindrical tube, the stiffener being joined at intervals to the inner cylindrical tube, thereby to improve the mechanical rigidity of the inner cylindrical tube.

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Номер записи: 9
05-04-2012 дата публикации

System and method for self-sealing a coldhead sleeve of a magnetic resonance imaging system

Номер: US20120081117A1
Автор: Evangelos Trifon Laskaris, In-Hua Xu, Jalal Zia, John Arthur Urbahn, John Scaturro, Jr., Kathleen Melanie Amm, Longzhi Jiang, William Einziger
Принадлежит: General Electric Co

Systems and methods for self-sealing a coldhead sleeve of a magnetic resonance imaging system are provided. One coldhead sleeve arrangement includes a coldhead sleeve configured to receive therein a coldhead of an MRI system and having an open end. The coldhead sleeve arrangement also includes a sealing member coupled at the open end of the coldhead sleeve and configured in a normally closed position covering the open end.

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Номер записи: 10
12-04-2012 дата публикации

Rf coil and magnetic resonance imaging apparatus

Номер: US20120086452A1
Автор: Manabu Mochizuki, Masayoshi Dohata, Shinichiro Suzuki
Принадлежит: Hitachi Medical Corp

It is an object of the present invention to provide an RF coil and an MRI apparatus capable of ensuring a wide imaging space and excellent in terms of allowing maintenance at the time of installation or failure. In order to do so, an RF coil of the present invention includes a cylindrical outer conductor and a plurality of rung conductors disposed inside the outer conductor along a circumferential direction of the outer conductor. In addition, each of the plurality of rung conductors is electrically connected to the outer conductor through a capacitor so as to form an electrical loop. The outer conductor is divided into a plurality of portions in the circumferential direction and is characterized in that the numbers of rung conductors disposed in at least two divided portions are different. In addition, an MRI apparatus of the present invention includes such an RF coil.

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Номер записи: 11
19-04-2012 дата публикации

Nmr reaction monitoring flow cell

Номер: US20120092013A1
Автор: Brian MARQUEZ, Don PIROLI, Eckhard Bez, Kimberly L. COLSON, Michael Fey, Robert KRULL, Werner E. Maas
Принадлежит: Bruker Biospin Corp

A monitoring cell, used to perform a measurement in an NMR spectrometer of a reaction fluid produced by a reaction vessel, has a body having inlet and outlet transport coaxial capillaries for transporting the reaction fluid between the body and the reaction vessel. Cooling lines are also positioned coaxially with the transport capillaries to transport cooling liquid between the body and the reaction vessel. The cell further has a hollow sample probe for insertion into the NMR spectrometer and a coupler section that removably connects the sample probe to the body so that the inlet transport capillary extends through the body into the interior of the sample probe and the outlet transport capillary is sealed to the sample probe to allow reaction fluid that enters the sample probe via the inlet transport capillary to exit the sample probe via the outlet transport capillary.

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Номер записи: 12
03-05-2012 дата публикации

Magnetic resonance imaging apparatus and magnetic resonance imaging method

Номер: US20120108946A1
Автор: Shigehide Kuhara
Принадлежит: Individual

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.

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Номер записи: 13
10-05-2012 дата публикации

High magnetic field compatible interventional needle and integrated needle tracking system

Номер: US20120116209A1
Автор: Axel Winkel, Bernardus Hendrikus Wilhelmus Hendriks, John Brean Mills, Mareike Klee, Ronald Dekker
Принадлежит: KONINKLIJKE PHILIPS ELECTRONICS NV

An elongate device (e.g. a catheter) for interventional MRI has one or more passive LC-circuits (wireless markers) attached to its distal tip portion for position tracking. The LC-circuits comprise an inductor winding ( 480 ) and a three-dimensional “trench” capacitor ( 420 - 440 ) and are integrated in a piece of silicon ( 410 ). Optical fibres may be included in the device for optical probing of tissue surrounding the distal tip portion.

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Номер записи: 14
17-05-2012 дата публикации

Arrangement and method for influencing and/or detecting magnetic particles and for magnetic resonance imaging

Номер: US20120119739A1
Автор: Bernhard Gleich
Принадлежит: KONINKLIJKE PHILIPS ELECTRONICS NV

Magnetic particle imaging allows the imaging of fast tracer dynamics, but there is no native tissue contrast. A combination with MRI solves this issue. However, coil geometries in MPI and MRI differ significantly, making direct use impractical. According to one aspect of the present invention it is proposed to use pre-polarized MRI to overcome these difficulties. Further, methods and arrangements are proposed to achieve MRI imaging with minimal additional hardware.

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Номер записи: 15
07-06-2012 дата публикации

Mrt receiver coil with local data storage

Номер: US20120139538A1
Автор: Markus Vester, Sebastian Schmidt
Принадлежит: SIEMENS AG

The present embodiments relate to a method and a local coil arrangement for a magnetic resonance tomography system. The local coil arrangement includes an antenna element for the reception of signals from an object under examination. The local coil arrangement also includes an A/D converter for the conversion of analog signals received with the antenna element into digitized signals, and a memory configured for the storage of the digitized signals.

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Номер записи: 16
14-06-2012 дата публикации

Nanophotonic system for optical data and power transmission in medical imaging systems

Номер: US20120146646A1
Автор: Christopher Judson Hardy, Sasikanth Manipatruni
Принадлежит: General Electric Co

The present disclosure is directed towards the transmission of data and/or power using nanophotonic elements. For example, in one embodiment, a medical imaging system is provided. The imaging system includes a multiplexed photonic data transfer system having an optical modulator configured to receive an electrical signal representative of a set of data and being operable to modulate a subset of photons defined by time, wavelength, or polarization contained within a beam of light so as to encode the photons with the set of data to produce encoded photons, an optical waveguide interfacing with at least a portion of the optical modulator and configured to transmit the beam of light so as to allow the photons to be modulated by the optical modulator, an optical resonator in communication with the optical waveguide and configured to remove the encoded photons from the beam of light, and a transducer optically connected to the optical resonator and configured to convert the encoded photons into the electrical signal representative of the set of data.

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Номер записи: 17
05-07-2012 дата публикации

Multi-element transmit rf chain with local automatic tune and match device

Номер: US20120169335A1
Автор: Christoph Leussler
Принадлежит: KONINKLIJKE PHILIPS ELECTRONICS NV

An automatic tune and match device ( 3 ) and method comprises a reflected power sensor ( 32 ) which detects power reflected from a load ( 18,18 ′) and an LC matching circuit, in series with the load, being programmable to minimize the reflected power. The LC matching circuit includes an inductor matrix ( 34 ) in series with the load ( 18, 18 ′) and a capacitor matrix ( 36 ) in parallel with the inductor matrix. A matrix controller ( 38 ) configures at least one of the inductor matrix or capacitor matrix based on the detected reflected power to minimize the reflected power.

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Номер записи: 18
05-07-2012 дата публикации

Open Architecture Imaging Apparatus and Coil System for Magnetic Resonance Imaging

Номер: US20120172704A1
Автор: Cameron Anthony Piron, Christopher Alexander Luginbuhl, Donald B. Plewes
Принадлежит: Hologic Inc

Apparatus and method for using radio frequency coil systems for magnetic resonance imaging within an open architecture apparatus is provided. The MRI coil system includes a support structure with an open architecture in which secondary support structures, compression systems and plates containing RF coil systems may be introduced. These structures and RF coils can be moved relative to the patient, or removed entirely from the system. In one embodiment the system consists of a tabletop coil system, while another embodiment consists of a dedicated stretcher design.

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Номер записи: 19
19-07-2012 дата публикации

Apparatus and method for protecting a magnetic resonance imaging magnet during quench

Номер: US20120182012A1
Автор: Jian-She Wang, Weijun Shen, Yuri Lvovsky
Принадлежит: General Electric Co

A superconducting magnet assembly comprising a plurality of superconducting magnet coil portions forming a coil series circuit to provide a magnetic field, a power supply to supply power to the plurality of superconducting magnet coil portions during a magnet ramp mode of operation, and a ramp switch coupled to the superconducting magnet coil portions, wherein the ramp switch is configured to be open during a magnet ramp mode and closed during a persistent mode. A dump resistor is disposed externally to the vessel and is connectable by the ramp switch to the superconducting magnet coil portions. Further, a controller is coupled to at least one superconducting magnet coil portion and the ramp switch and is configured to detect a quench onset condition in the at least one superconducting magnet coil portion and to open the ramp switch upon detection of the quench onset condition in order to dump magnet energy.

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Номер записи: 20
02-08-2012 дата публикации

Power converter system

Номер: US20120193992A1
Автор: Oliver Heuermann
Принадлежит: SIEMENS AG

A power converter system includes a first unipolar voltage source that produces a first voltage and a second unipolar voltage source that produces a second voltage. The power converter system also includes a transformer with a first primary winding, a second primary winding, and a secondary winding, and control equipment. The first primary winding is connected to the first unipolar voltage source, and the second primary winding is connected to the second unipolar voltage source such that when the first voltage is applied, a first secondary voltage is induced in the secondary winding and that when the second voltage is applied, a second secondary voltage is induced. The first secondary voltage is directed in opposition to the second secondary voltage. The control equipment drives the first unipolar voltage source and the second unipolar voltage source in alternation for the production of the first voltage and the second voltage.

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Номер записи: 21
09-08-2012 дата публикации

Magnetic resonance antenna arrangement

Номер: US20120200294A1
Автор: Razvan Lazar
Принадлежит: SIEMENS AG

A magnetic resonance antenna arrangement having a plurality of antenna elements disposed around a measurement chamber and a plurality of switching elements is provided. The antenna elements and the switching elements are disposed and interconnected such that in a first switching configuration of the switching elements, the antenna elements form a first antenna architecture, and in a second switching configuration of the switching elements, the antenna elements form a second antenna architecture.

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Номер записи: 22
23-08-2012 дата публикации

Magnetic resonance imaging apparatus

Номер: US20120212225A9
Автор: Mina IWAMA, Takashi Ishiguro, Yusuke Asaba
Принадлежит: Individual

A magnetic resonance imaging apparatus includes a bore configured to accommodate a subject therein, an RF coil positioned about the bore, and an RF shield positioned about the RF coil. The RF coil includes a first portion positioned adjacent a lower surface side of the bore and spaced a distance from the RF shield that is larger than a distance between a second portion of the RF coil and an upper surface side of the bore.

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Номер записи: 23
13-09-2012 дата публикации

Apparatus and method to reduce noise in magnetic resonance imaging systems

Номер: US20120229138A1
Автор: Saikat Saha, Timothy John Havens, WASHINGTON de LIMA
Принадлежит: General Electric Co

An apparatus and method to reduce noise in magnetic resonance imaging (MRI) systems are provided. One MRI system includes a gantry having a bore therethrough and at least one radio frequency (RF) coil supported by the gantry for imaging an object within the bore. The MRI system also includes a vacuum space between the at least one RF coil and the bore.

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Номер записи: 24
20-09-2012 дата публикации

Supported Superconducting Magnet

Номер: US20120238453A1
Автор: Marcel Kruip, Nicholas Mann
Принадлежит: Siemens PLC

A supported superconducting magnet includes a superconducting magnet arranged within an outer vacuum container and a support structure bearing the weight of the superconducting magnet against a support surface. The support structure includes a tubular suspension element located between the magnet and the support surface, the tubular suspension element retaining the magnet in a fixed relative position with reference to the outer vacuum container by means of complementary interface surfaces arranged to transmit the weight of the superconducting magnet to the support structure. The tubular suspension element is arranged about a generally vertical axis, and supports a solenoidal magnet structure which is arranged about a generally horizontal axis.

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Номер записи: 25
27-09-2012 дата публикации

Remotely adjustable reactive and resistive electrical elements and method

Номер: US20120242550A1
Автор: Carl J. Snyder, Charles A. Lemaire, John Thomas Vaughan, Jr.
Принадлежит: Life Services LLC

Apparatus and method that includes providing a variable-parameter electrical component in a high-field environment and based on an electrical signal, automatically moving a movable portion of the electrical component in relation to another portion of the electrical component to vary at least one of its parameters. In some embodiments, the moving uses a mechanical movement device (e.g., a linear positioner, rotary motor, or pump). In some embodiments of the method, the electrical component has a variable inductance, capacitance, and/or resistance. Some embodiments include using a computer that controls the moving of the movable portion of the electrical component in order to vary an electrical parameter of the electrical component. Some embodiments include using a feedback signal to provide feedback control in order to adjust and/or maintain the electrical parameter. Some embodiments include a non-magnetic positioner connected to an electrical component configured to have its RLC parameters varied by the positioner.

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Номер записи: 26
04-10-2012 дата публикации

Magnetic resonance local coil

Номер: US20120249148A1
Автор: Christina Schindler, Daniel Evers, Florian Poprawa, Jörg ZAPF, Klaus Huber, Markus Vester
Принадлежит: Individual

The present embodiments relate to a magnetic resonance local coil with a receive antenna for receiving magnetic resonance signals. The magnetic resonance local coil also includes a transmission unit for transmitting magnetic resonance signal data generated on the basis of the magnetic resonance signals via a data transmit antenna of the magnetic resonance local coil to a signal data receiving unit of a magnetic resonance tomography systems. The transmission unit is provided, at least in sections, with screening with a first metal coating and a first dielectric coating.

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Номер записи: 27
04-10-2012 дата публикации

Image recording device for the simultaneous recording of magnetic resonance image data and nuclear medical image data

Номер: US20120253174A1
Автор: Stefan Popescu
Принадлежит: SIEMENS AG

An image recording device is disclosed for the simultaneous recording of magnetic resonance image data and nuclear medical image data, in particular PET image data. In at least one embodiment, the image recording device includes a nuclear medical detector arrangement integrated into a magnetic resonance device, wherein a fluorescence detector arrangement including an optical system and designed for fluorescence imaging is also integrated into the magnetic resonance device.

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Номер записи: 28
11-10-2012 дата публикации

Nuclear-spin polarization detection device and nuclear-spin polarization detection method

Номер: US20120256629A1
Автор: Hongwu Liu, Kaifeng Yang, Yoshiro Hirayama
Принадлежит: JAPAN SCIENCE AND TECHNOLOGY AGENCY

Provided is a total electrical nuclear-spin polarization device that is applicable to many narrow-gap semiconductor two-dimensional quantum structures such as InSb with a large g-factor and with a mobility having a normal value. A nuclear-spin polarization device 1 creates a state where the Landau-level separation and the Zeeman-level separation in a sample are equal to each other in a magnetic field, thereby crossing different spin states, and detects nuclear-spin polarization from a resistance change at the crossing point caused by the nuclear-spin polarization.

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Номер записи: 29
11-10-2012 дата публикации

NMR measuring configuration with optimized sample container geometry and method for calculating the shape of the sample container

Номер: US20120256632A1
Автор: Dirk Wilhelm, Oskar Schett, Thomas Speck
Принадлежит: Individual

A sample container ( 2 ) for NMR measurements defines a volume (V) of sample substance. The sample container ( 2 ) has a first interface (G 1 ) towards an environment ( 1 ) and a second interface (G 2 ) towards the sample substance ( 3 ). A susceptibility jump at the second interface G 2 is sufficiently large that the maximum value of |B′ G2 /B 0 | within the volume (V) is at least 0.5 ppm. The geometry of the sample container ( 2 ) is selected in such a fashion that, when a homogeneous magnetic field B 0 has been applied, a location-dependent relative field change F is present in the volume (V), which is larger than 20 ppb at least at one point in a center partial volume (V 1 ) and a first residual field (R 1 ) in the center partial volume (V 1 ) is smaller than 1.6 ppb. A second residual field (R 2 a ) in the lower partial volume (V 2 a ) is smaller than 30 ppb.

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Номер записи: 30
25-10-2012 дата публикации

Magnetic Resonance Signal Detection Using Remotely Positioned Receive Coils

Номер: US20120268132A1
Автор: Haoqin Zhu, John Saunders, Labros Petropoulos, Mehran Fallah-Rad, Michael Lang, Wayne Schellekens
Принадлежит: Individual

The receive coil arrangement includes an inner local volume coil adjacent the part to be imaged so as to maximize the received MR signal and an outer coil, which may be the built in body coil of the magnet, connected by cable to the signal processing system. Both the coils are individually tuned to the common resonant frequency and the local volume coil include an arrangement to halt current flow therein during the transmit stage. The local volume coil has no cable and is arranged to communicate the MR signal therein to the signal processing system through the outer coil by inductive coupling to the outer coil. Despite inherent losses by interfering with the tuning of the loops and in the inductive coupling this magnifies the MR signal and makes the local volume coil wireless.

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Номер записи: 31
01-11-2012 дата публикации

Msc-selmqc method for simultaneous mapping of polyunsaturated fatty acids, lactate and choline in high fat tissues

Номер: US20120274323A1
Автор: Qiuhong He
Принадлежит: University of Pittsburgh

Systems and methods employing spin editing techniques to improve magnetic resonance spectroscopy (MRS) and magnetic resonance spectroscopic imaging (MRSI) are discussed. Using these spin editing techniques, magnetic resonance signals of one or more unwanted chemicals (that is, chemicals whose signals are to be filtered out or suppressed) chemicals can be suppressed, so that the signal(s) of a first set of chemicals can be obtained without signals from the one or more unwanted chemicals. Information about and differences between the molecular topologies of the first set of chemicals and the one or more unwanted chemicals can be used to design a sequence that suppresses the one or more unwanted chemicals while allowing acquisition of signal(s) from the first set of chemicals.

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Номер записи: 32
01-11-2012 дата публикации

Magnetic shielding material for superconducting magnet

Номер: US20120274327A1
Автор: Hiroaki Hoshikawa, Hiroshi Tabuchi, Kenichi Sasaki, Takayuki Tomaru
Принадлежит: Inter University Research Institute Corp High Energy Accelerator Research Organization, Sumitomo Chemical Co Ltd

A magnetic shielding material which can decrease the thickness by having excellent conductivity even at low temperatures of, for example, 77 K or lower, in a strong magnetic field of a magnetic flux density of 1 T or more is provide. A magnetic shielding material to be used at low temperatures of 77 K or lower in the magnetic field of a magnetic flux density of 1 T or more, comprises aluminum having a purity of 99.999% by mass or more.

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Номер записи: 33
08-11-2012 дата публикации

Linear Phase Microstrip Radio Frequency Transmit Coils

Номер: US20120280685A1
Автор: Dennis L. Parker, Glen R. Morrell, J. Rock Hadley
Принадлежит: University of Utah Research Foundation UURF

Systems, devices and methods provide an RF coil which produces a field having linear phase variation across an imaging volume. In one embodiment, a coil comprises multiple microstrip elements configured to have an increased effective electrical length. This increase in electrical length allows for a larger linear phase shifts over the length of the microstrip element which in turn increases linear phase variation capabilities. This may be accomplished by increasing the effective dielectric properties of the microstrip element. Increasing the effective dielectric may be accomplished by utilizing distributed capacitors along the length of a microstrip element (e.g. lumped element capacitors), by altering the materials used to fabricate the microstrip element, etc. Additionally, increasing the effective dielectric may be accomplished using a combination of these means. Embodiments may further enable linear phase variation along the imaging volume at high frequencies, such as frequencies utilized for 3 T and above MRI devices.

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Номер записи: 34
29-11-2012 дата публикации

Margin assessment of ex-vivo sample

Номер: US20120299591A1
Автор: Erez Golan
Принадлежит: CLEAR-CUT MEDICAL Ltd

A system ( 10 ) for margin assessment of an ex-vivo tissue ( 18 ), including an imaging scanner ( 12 ) controlled by an imaging control unit ( 14 ), and an ex-vivo sample holder ( 16 ) for holding a sample of an excised tissue ( 18 ), the sample holder ( 16 ) being sized such that excised lump edges ( 24 ) of the excised tissue ( 18 ) are forced against a surface of the sample holder ( 16 ) such that the edges ( 24 ) change shape to have a predetermined geometry, and wherein the imaging scanner ( 12 ) is positioned relative to the sample holder ( 16 ) such that the imaging scanner ( 12 ) acquires images not of all the tissue ( 18 ) but rather of the edges ( 24 ) that have the predetermined geometry and which are in a sensitive region ( 40 ) extending into a peripheral margin of the tissue ( 18 ).

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Номер записи: 35
13-12-2012 дата публикации

Nmr device for detection of analytes

Номер: US20120313639A1
Автор: W. David Lee
Принадлежит: T2 Biosystems Inc

This invention relates generally to detection devices having one or more small wells each surrounded by, or in close proximity to, an NMR micro coil, each well containing a liquid sample with magnetic nanoparticles that self-assemble or disperse in the presence of a target analyte, thereby altering the measured NMR properties of the liquid sample. The device may be used, for example, as a portable unit for point of care diagnosis and/or field use, or the device may be implanted for continuous or intermittent monitoring of one or more biological species of interest in a patient.

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Номер записи: 36
13-12-2012 дата публикации

Magnetic resonance imaging (mri) device noise dampening system

Номер: US20120313643A1
Автор: Abdel-Monem El-Sharkawy, William A. Edelstein
Принадлежит: Abdel-Monem El-Sharkawy, Edelstein William A

Disclosed herein is a magnetic resonance imaging (MRI) device noise dampening system, including an adjustable vibration dampening suspension system arranged between a gradient winding assembly of the MRI device and a support structure supported by a primary magnet assembly of an MRI device, wherein the adjustable vibration dampening suspension system comprises: a plurality of separately inflatable support elements; a vibration reducing material coupled to at least one of a plurality of connecting elements associated with a gradient winding assembly of an MRI device; and/or an acoustic noise absorbing material at least partially filling a space containing a gradient winding assembly of an MRI device.

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Номер записи: 37
20-12-2012 дата публикации

Method for producing a gradient coil assembly and winding mandrel

Номер: US20120317795A1
Автор: Johann Schuster, Ralph Kimmlingen, Sascha Fath
Принадлежит: SIEMENS AG

A method for producing a gradient coil assembly for a magnetic resonance imaging system includes applying a number of primary gradient coils and a number of secondary gradient coils to a winding mandrel to form the gradient coil assembly. A control coil arrangement is associated with the winding mandrel. During an intermediate check before completion of the gradient coil assembly, at least one coupling inductance value between the control coil arrangement and at least one of the primary gradient coils and/or at least one of the secondary gradient coils is determined. An arrangement of the relevant gradient coils on the winding mandrel is corrected as a function of the at least one coupling inductance value.

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Номер записи: 38
20-12-2012 дата публикации

Balanced mixer for mri system and method of making same

Номер: US20120319688A1
Автор: Robert Steven Stormont
Принадлежит: General Electric Co

A magnetic resonance imaging (MRI) apparatus includes an RF coil, a preamplifier module, and a hub coupled to the preamplifier module via a transmission line. The preamplifier module includes an amplifier configured to amplify a magnitude of a first signal from the RF coil, the first signal having a first frequency and a diode array coupled to the amplifier. The MRI apparatus also includes an intermediate frequency (IF) circuit coupled to the transmission line and an oscillator circuit coupled to the hub and configured to supply an oscillating signal to the diode array via the transmission line to cause the diode array to mix the oscillating signal with the first signal to generate an IF signal to be received by the IF circuit via the transmission line, wherein the IF signal has a second frequency that is lower than the first frequency.

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Номер записи: 39
27-12-2012 дата публикации

Pressure Vessel for Non-Destructive or Non-Contact Material Characterization

Номер: US20120326718A1
Автор: David Peter Gerrard, Omar H. Balcazar
Принадлежит: Baker Hughes Inc

A method and apparatus for measuring a parameter of an object is disclosed. The object is placed within a vessel configured to contain the object via an opening in the vessel. A cover is placed over the opening. A securing device is used to secure the cover to the vessel. A measurement device is used to measure the parameter of the object at a raised pressure. The parameter can be a nuclear magnetic resonance parameter of the object. A fluid in the vessel can be heated to raise the pressure within the sealed vessel. In various embodiments, the securing device can be a second cover or a clamp, for example. The measured parameter can be used in determining a suitability of the object for use in downhole environments.

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Номер записи: 40
27-12-2012 дата публикации

Potential obtaining apparatus, magnetic field microscope, inspection apparatus, and potential obtaining method

Номер: US20120330581A1
Автор: Kenjiro Kimura
Принадлежит: Kobe University NUC

In a magnetic field obtaining apparatus, a measuring part ( 21 ) that is sufficiently longer than the width of an area to be measured is disposed on a measurement plane that satisfies z=α, and scanning in an X′ direction perpendicular to the longitudinal direction of the measuring part ( 21 ) is repeated while changing an angle θ formed by a predetermined reference direction on the measurement plane and the longitudinal direction of the measuring part ( 21 ) to a plurality of angles. Assuming that x′ is a coordinate parameter in the X′ direction, measured values f(x′, θ) obtained by repetitions of the scanning are Fourier transformed so as to obtain g(k x′ , θ) (where k x′ is a wavenumber in the X′ direction). Then, g(k x′ , θ) is substituted into a predetermined two-dimensional potential obtaining equation so as to obtain φ(x, y, α) that indicates a two-dimensional potential on the measurement plane. Accordingly, it is possible to perform high-resolution two-dimensional potential measurement as a result of using the measuring part ( 21 ) that is sufficiently larger than the width of an area to be measured.

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Номер записи: 41
10-01-2013 дата публикации

Cryostat configuration

Номер: US20130008187A1
Автор: Alexander Baer, Andreas Kraus, Joerg HINDERER
Принадлежит: Individual

A cryostat configuration with a vacuum vessel ( 1 ) and a cryogen vessel ( 2 ) built into it, and a sleeve ( 8 ), into which a cryocooler ( 7 ) is built, wherein the upper, warm end of the sleeve is connected to the outer jacket and the lower, cold end facing the cryogen vessel is hermetically sealed by a sleeve base ( 9 ) is characterized in that the cryogen vessel is hermetically sealed except for a gas capillary ( 13 ) and filled with gaseous fluid ( 12 ) at a pressure below the vapor pressure of the liquid phase of the fluid at the corresponding operating temperature and the coldest stage of the cryocooler is connected to the heat exchanger ( 11 ) disposed inside the cryogen vessel in a manner that ensures good thermal conduction.

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Номер записи: 42
24-01-2013 дата публикации

System for Adapting an RF Transmission Magnetic Field for Image Acquisition

Номер: US20130021033A1
Автор: Bernd Stoeckel, Stefan Roll
Принадлежит: Siemens Medical Solutions USA Inc

A system generates a Radio Frequency (RF) magnetic field in an MR imaging unit using an RF transmitting coil for generating a Radio Frequency (RF) magnetic field and multiple RF receiver coils for receiving RF signals for Magnetic Resonance (MR) image data acquisition. An RF transmission coil generates an RF magnetic field. An RF receiver coil receives an RF signal for MR image data acquisition and couples a magnetic field from the RF receiver coil to the RF transmission coil for adaptively altering the RF magnetic field generated by the RF transmission coil to reduce inhomogeneity in the RF magnetic field generated by the RF transmission coil in response to applying an RF pulse to the RF transmission coil. An adjustment processor adjusts characteristics of the RF receiver coil to alter the RF magnetic field generated by the RF transmission coil.

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Номер записи: 43
24-01-2013 дата публикации

Adapter for a direct-connection head coil with adjustable tilt angle

Номер: US20130023756A1
Автор: Daniel Driemel, Hubertus Fischer
Принадлежит: SIEMENS AG

An adapter for a local coil for a magnetic resonance tomography device is provided. The adapter is placeable on a patient support for the magnetic resonance tomography device. The adapter includes an adapter upper part that is removably connectable to the local coil. The adapter also includes an adapter lower part that is removably connectable to the patient support. The adapter also includes a tilt device, by which the adapter upper part is movable relative to the adapter lower part.

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Номер записи: 44
31-01-2013 дата публикации

Method for recording magnetic resonance data with a magnetic resonance facility

Номер: US20130027035A1
Автор: Bjorn Heismann, Markus Vester, Sebastian Schmidt
Принадлежит: SIEMENS AG

A method for recording magnetic resonance data with a magnetic resonance facility is proposed. Protons and sodium are excited. A proton magnetic resonance data record and a sodium magnetic resonance data record are recorded. The proton magnetic resonance data and the sodium magnetic resonance data are recorded during a single recording process.

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Номер записи: 45
31-01-2013 дата публикации

End flange for a magnetic resonance imaging system and method of manufacturing

Номер: US20130027039A1
Автор: Longzhi Jiang
Принадлежит: General Electric Co

An end flange for a magnetic resonance imaging (MRI) system and method for manufacturing an end flange are provided. One end flange is for a vacuum vessel of the MRI system. The vacuum vessel includes a housing configured to receive therein a magnet assembly and an end flange forming an end of the housing. The flange includes an outer surface, an inner surface, and a core coupled between the outer and inner surfaces, wherein the core has a greater stiffness than the outer surface and the inner surface.

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Номер записи: 46
07-02-2013 дата публикации

Apparatus for improving grounding for an electrical component and method of making same

Номер: US20130033835A1
Автор: Fraser John Laing Robb, II Miguel Angel Navarro, Peter Asuzu, Victor Taracila, Vijayanand Alagappan
Принадлежит: General Electric Co

A multi-layer cradle comprises a first layer comprising first and second contact pads configured to be electrically coupled to a signal input and a signal output of the electronic component, respectively. The first layer also comprises a first ground plane configured to be electrically coupled to a ground of the electronic component and a first fence positioned about the first ground plane. The first ground plane is positioned at least between the first and second contact pads. A second layer comprising a second ground plane is also included. The cradle further comprises a first dielectric material positioned between the first and second layers, a ground plane via extending through the first dielectric material and electrically coupled to the first and second ground planes, and a plurality of fence vias extending through the first dielectric material and electrically coupled to the first fence and to second ground plane.

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Номер записи: 47
21-02-2013 дата публикации

Method and apparatus for controlling an amplifier of a magnetic resonance imaging device

Номер: US20130043871A1
Автор: Hyug-Rae Cho, Jung-Woo Lee, Seung-je CHOI
Принадлежит: SAMSUNG ELECTRONICS CO LTD

An magnetic resonance imaging (MRI) device includes at least one amplifier, a control module which controls an operating module of the at least one amplifier, a back-up control module, a determination unit for determining whether the control module is operating normally, and a switching module for performing a switching operation to switch operations of the control module to the at least one back-up control module in the event of abnormal operation of the control module.

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Номер записи: 48
21-03-2013 дата публикации

Method of controlling an mri system and an apparatus therefor

Номер: US20130069644A1
Автор: Hyug-Rae Cho, Joon-Soo Kim, Ju-hyung Lee, Young-Cheol Kwon
Принадлежит: SAMSUNG ELECTRONICS CO LTD

A magnetic resonance imaging (MRI) system includes a radio frequency (RF) coil which receives timing information about a pulse sequence and stores the timing information in a memory of the RF coil. Then, when an RF excitation signal is transmitted, the RF coil performs decoupling. When a magnetic resonance (MR) echo signal is generated, the RF coil receives the MR echo signal and transmits the MR echo signal to a central controlling apparatus through a wireless channel. When a transmission error arises, the RF coil retransmits corresponding data in an idle time when the RF excitation signal is not transmitted or the MR echo signal is not generated. Thus, the RF coil is prevented from being damaged by the RF excitation signal and prevents the quality of an MR image from deteriorating compared to a synchronization-type communication method.

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Номер записи: 49
21-03-2013 дата публикации

METHOD AND MAGNETIC RESONANCE SCANNER FOR HYPERINTENSE DISPLAY OF AREAS IN THE VICINITY OF DIPOLE FIELDS

Номер: US20130069648A1
Автор: Grodzki David
Принадлежит: SIEMENS AKTIENGESELLSCHAFT

In a method and magnetic resonance apparatus for the hyperintense display of areas containing particles of magnetically active substances, in an examination region in a measurement volume of a magnetic resonance scanner, measurement data from the examination area are generated by a pulse sequence and recorded, the pulse sequence causing an echo time of less than one millisecond, so that a suppression of undesired signals is also caused. 1. A method for hyperintense display of areas in a vicinity of dipole fields in an examination area located in a measurement volume of a magnetic resonance data acquisition unit , comprising stimulating nuclear spins in said areas in said vicinity of said dipole fields , and detecting magnetic resonance data resulting from said stimulation of said nuclear spins , by operating said data acquisition unit with a pulse sequence that causes an echo time of less than a millisecond and that suppressed undesired signals.2. A method as claimed in comprising operating said data acquisition unit with an ultrashort echo time (UTE) sequence as said pulse sequence.3. A method as claimed in comprising operating said data acquisition unit with said pulse sequence comprising:(a) activating at least two phase encoding gradients, each in a respective spatial plane, by operating a gradient system of said data acquisition unit, each of said at least two phase encoding gradients exhibiting a gradient that eventually reaches full strength;(b) after said activated phase encoding gradients reach said full strength, stimulating said nuclear spins by radiating a non-slice selective radio-frequency RF excitation pulse from an RF transmitter/receiver device of said magnetic resonance data acquisition unit, said RF transmitter/receiver device being operable in a transmission mode and a receiving mode and exhibiting a minimum switching time between operation in said transmission mode and operation in said receiving mode;(c) following a time period that is greater ...

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Номер записи: 50
21-03-2013 дата публикации

MAGNETIC RESONANCE IMAGING APPARATUS AND HIGH-FREQUENCY MAGNETIC FIELD PULSE MODULATION METHOD

Номер: US20130069650A1
Автор: ABE Takayuki
Принадлежит: HITACHI MEDICAL CORPORATION

Degradation of the slice excitation characteristics is prevented by making it possible to modulate a high frequency magnetic field pulse on the basis of a gradient magnetic field response that is actually used. In order to do so, an imaging pulse sequence including first and second measurement sequences is executed. In the first measurement sequence, the same slice selection gradient magnetic field pulse as a slice selection gradient magnetic field pulse used in the second measurement sequence is used. The phase of a magnetic resonance signal measured by the first measurement sequence is differentiated, and the waveform of the high frequency magnetic field pulse is calculated using the result. In the second measurement sequence, a high frequency magnetic field pulse with the calculated waveform is applied together with the slice selection gradient magnetic field pulse, and a magnetic resonance signal for an image is measured. 1. A magnetic resonance imaging apparatus comprising:a gradient magnetic field generating unit;a signal transmission unit that generates a high frequency magnetic field pulse;a signal receiving unit that receives a magnetic resonance signal from an object; anda control unit that controls the gradient magnetic field generating unit, the signal transmission unit, and the signal receiving unit on the basis of an imaging pulse sequence,wherein the imaging pulse sequence includes first and second measurement sequences, and in the first measurement sequence, the same slice selection gradient magnetic field pulse as a slice selection gradient magnetic field pulse used in the second measurement sequence is used, andthe control unit includes a high frequency magnetic field pulse calculating section that calculates a waveform of the high frequency magnetic field pulse generated by the signal transmission unit using a magnetic resonance signal measured by the first measurement sequence, and controls the signal transmission unit such that the high ...

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Номер записи: 51
21-03-2013 дата публикации

SYSTEM AND METHOD FOR MAGNETIC CURRENT DENSITY IMAGING AT ULTRA LOW MAGNETIC FIELDS

Номер: US20130072780A1
Автор: Espy Michelle A., GEORGE JOHN STEVENS, KRAUS ROBERT HENRY, MAGNELIND PER, MATLASHOV ANDREI NIKOLAEVICH, TUCKER DON, TUROVETS SERGEI, VOLEGOV PETR LVOVICH
Принадлежит:

Preferred systems can include an electrical impedance tomography apparatus electrically connectable to an object; an ultra low field magnetic resonance imaging apparatus including a plurality of field directions and disposable about the object; a controller connected to the ultra low field magnetic resonance imaging apparatus and configured to implement a sequencing of one or more ultra low magnetic fields substantially along one or more of the plurality of field directions; and a display connected to the controller, and wherein the controller is further configured to reconstruct a displayable image of an electrical current density in the object. Preferred methods, apparatuses, and computer program products are also disclosed. 1. An imaging system comprising:an electrical impedance tomography apparatus electrically connectable to an object;an ultra low field magnetic resonance imaging apparatus comprising a plurality of field directions and disposable about the object;a controller connected to the ultra low field magnetic resonance imaging apparatus and configured to implement a sequencing of one or more ultra low magnetic fields substantially along one or more of the plurality of field directions; anda display connected to the controller, and wherein the controller is further configured to reconstruct a displayable image of an electrical current density in the object.2. The system of claim 1 , wherein the electrical impedance tomography apparatus comprises one or more electrical leads to deliver an electrical current through the object in a predetermined current direction.3. The system of claim 2 , wherein an induced magnetic field generated by the electrical current is substantially parallel to at least one of the plurality of field directions.4. The system of claim 3 , wherein the sequencing of the one or more ultra low magnetic field pulses comprises a first setting in which the ultra low magnetic field pulse is substantially parallel to the induced magnetic ...

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Номер записи: 52
28-03-2013 дата публикации

MAGNETIC RESONANCE SYSTEM AND METHOD FOR CARRYING OUT MAGNETIC RESONANCE MEASUREMENTS IN AN INTRAORAL REGION

Номер: US20130076354A1
Автор: Schmidt Sebastian
Принадлежит:

The present embodiments relate to a magnetic resonance system for carrying out magnetic resonance measurements in an intraoral region. The magnetic resonance system includes a magnetic resonance coil element and an intraoral measuring device that measures the position of a number of measuring points situated in the intraoral region. 1. A magnetic resonance system for carrying out magnetic resonance measurements in an intraoral region , the magnetic resonance system comprising:a magnetic resonance coil element; andan intraoral measuring device that measures a position of a number of measuring points situated in the intraoral region.2. The magnetic resonance system as claimed in claim 1 , wherein the magnetic resonance coil element comprises a local coil.3. The magnetic resonance system as claimed in claim 2 , wherein the local coil and the intraoral measuring device are integrated in one physical unit.4. The magnetic resonance system as claimed in claim 1 , further comprising a bite piece claim 1 , the intraoral measuring device being integrated in the bite piece.5. The magnetic resonance system as claimed in claim 1 , wherein the intraoral measuring device is mounted in a defined position with respect to the magnetic resonance coil element.6. The magnetic resonance system as claimed in claim 1 , wherein the intraoral measuring device comprises a position detection device operable to determine a position of the magnetic resonance coil element claim 1 , the magnetic resonance system claim 1 , or a combination thereof claim 1 , relative to a reference point.7. The magnetic resonance system as claimed in claim 1 , wherein the intraoral measuring device comprises an optical measuring unit claim 1 , a mechanical measuring unit claim 1 , or optical and mechanical measuring units.8. The magnetic resonance system as claimed in claim 1 , further comprising a marking unit for applying claim 1 , projecting claim 1 , or applying and projecting artificial markers on teeth claim 1 ...

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Номер записи: 53
28-03-2013 дата публикации

RF RECEIVING COIL AND MAGNETIC RESONANCE IMAGING APPARATUS USING THE SAME

Номер: US20130076361A1
Автор: Kobayashi Chie, Oosawa Tooru, Taniguchi Takeshi
Принадлежит:

To order to provide an RF receiving coil having a structure that can be safely mounted on an object and an MRI apparatus including the RF receiving coil, the RF receiving coil includes a main body having one or more flexible closed conductor loops for receiving a nuclear magnetic resonance signal, a flexible outer cover section that covers the closed conductor loop, a preamplifier section that amplifies the nuclear magnetic resonance signal received by the closed conductor loop, and a housing section in which the preamplifier section is housed and which is more rigid than the outer cover section. The RF receiving coil is mounted on the object in a state where the main body is bent such that the end surfaces of both ends of the main body face each other, and the MRI apparatus performs imaging using such an RF receiving coil. 1. An RF receiving coil that is mounted on an object in order to receive a nuclear magnetic resonance signal from the object , the RF receiving coil comprising:a main body having a flexible closed conductor loop configured to receive the nuclear magnetic resonance signal, a flexible outer cover section that covers the closed conductor loop, a preamplifier section that amplifies the nuclear magnetic resonance signal received by the closed conductor loop, and a housing section in which the preamplifier section is housed and which is more rigid than the outer cover section,wherein the RF receiving coil is mounted on the object in a state where the main body is bent such that end surfaces of both ends of the main body face each other.2. The RF receiving coil according to claim 1 ,wherein the housing section is disposed approximately in the middle of the main body, andthe RF receiving coil is mounted on the object in a state where the main body is bent such that opposite places of the end surfaces of both the ends of the main body are disposed above the housing section.3. The RF receiving coil according to claim 1 ,wherein the main body includes a ...

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Номер записи: 54
04-04-2013 дата публикации

Nuclear magnetic resonance imaging apparatus and nuclear magnetic resonance imaging method

Номер: US20130082701A1
Автор: Kiyoshi Ishikawa, Natsuhiko Mizutani, Tetsuo Kobayashi
Принадлежит: Canon Inc

The present invention has an object to provide a nuclear magnetic resonance imaging apparatus or the like that avoids a region with zero sensitivity of an optical magnetometer and allows imaging by strong magnetic resonance when a common magnetic field is used as a bias field of an optical magnetometer and as a magnetostatic field to be applied to a sample. When a direction of a magnetostatic field application unit applying a magnetostatic field to a sample is a z direction, alkali metal cells of a plurality of scalar magnetometers are arranged so as not to overlap a region to be imaged in a z direction, and so as not to intersect the region to be imaged in an in-plane direction perpendicular to the z direction.

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Номер записи: 55
04-04-2013 дата публикации

MAGNETIC RESONANCE IMAGING DEVICE AND TRANSMITTING SENSITIVITY DISTRIBUTION CALCULATION METHOD

Номер: US20130082708A1
Автор: Bito Yoshitaka, Kaneko Yukio, Taniguchi Yo, Yokosawa Suguru
Принадлежит: HITACHI MEDICAL CORPORATION

B1 distribution is calculated in a short time with a high degree of precision, and a high quality image is obtained. In the RF shimming for irradiating electromagnetic waves using an RF coil having multiple channels, the absolute values of subtraction images between multiple reconstructed images are used to calculate a transmitting sensitivity distribution which is necessary for calculating inter-channel phase difference and amplitude ratio of RF pulses provided to the respective channels. Those multiple reconstructed images are obtained by executing the imaging sequence after applying a prepulse at different flip angles respectively. Assuming an image obtained with a minimum flip angle as a reference image, for instance, the subtraction images are created between the reference image and the other respective images. It is also possible that multiple subtraction images being obtained are divided by one another, and the transmitting sensitivity distribution is created on the basis of the division result. 1. A magnetic resonance imaging apparatus , comprising ,a static magnetic field forming unit for forming a static magnetic field in a space where a subject is placed,a gradient magnetic field applying unit for applying a gradient magnetic field to the subject,a radio frequency magnetic field applying unit having a transmission coil with multiple channels and applying a radio frequency magnetic field to the subject,a signal receiving unit for receiving a nuclear magnetic resonance signal generated from the subject,a measurement control unit for controlling according to a predetermined imaging sequence, operations of the gradient magnetic field applying unit, the radio frequency magnetic field applying unit, and the signal receiving unit, thereby performing measurement, anda transmitting sensitivity shimming preparing unit for calculating inter-channel phase difference and amplitude ratio of RF pulses applied from the channels respectively, so as to correct ...

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Номер записи: 56
04-04-2013 дата публикации

SIGNAL SPLITTER

Номер: US20130082711A1
Автор: Albrecht Adam
Принадлежит:

A signal splitter for creating at least two symmetrical equal-power signals from an input signal for use in an amplifier device includes at least one input terminal pair and at least two output terminal pairs. A primary conductor structure supplied from the at least one input terminal pair is provided for induction of a current flow in at least two secondary conductor structures each connected to an output terminal pair of the at least two output terminal pairs and the at least two secondary conductor structures. A center of a conductor length of each of the at least two secondary conductor structures is connected to ground, and the primary conductor structure and the at least two secondary conductor structures are realized as conductor tracks applied to a printed circuit board. 1. A signal splitter operable to create at least two symmetrical signals from an input signal , the signal splitter comprising:at least one input terminal pair;at least two output terminal pairs;a primary conductor structure supplied from the at least one input terminal pair; andat least two secondary conductor structures, each of the at least two secondary conductor structures being connected to an output terminal pair of the at least two output terminal pairs, the primary conductor structure being for induction of a current flow in the at least two secondary conductor structures,wherein a center of a line length of each secondary conductor structure of the at least two secondary conductor structures is connected to ground, andwherein the primary conductor structure and the at least two secondary conductor structures comprise conductor tracks applied to a printed circuit board.2. The signal splitter as claimed in claim 1 , wherein the primary conductor structure surrounds the at least two secondary conductor structures as a loop.3. The signal splitter as claimed in claim 2 , wherein the primary conductor structure substantially runs in a U-shape claim 2 , andwherein the at least two ...

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Номер записи: 57
11-04-2013 дата публикации

Magnetic Resonance Examination with Instrument Detection

Номер: US20130088229A1
Автор: Van Den Brink Johan Samuel
Принадлежит: KONINKLIJKE PHILIPS ELECTRONICS N.V.

An magnetic resonance examination system for examination of an object comprises an RF system to generate an RF transmission field and gradient system to generate temporary magnet gradient fields. A control module includes a sequence controller to control the RF system and the gradient system to produce acquisition sequences including RF pulses and magnetic gradient pulses to generate magnetic resonance signals. The sequence controller is configured to produce an detection scan including a steady state gradient echo acquisition sequence to generate steady state gradient echo signals and an RF spoiled echo acquisition sequence to produce RF spoiled echo signals. The control module further including an analysis unit to compare the gradient echo signals to the RF spoiled echo signals and for detection of an instrument in the object from the comparison of the gradient echoes and the RF spoiled echoes. 1. A magnetic resonance examination system for examination of an object comprising:a RF system to generate a RF transmission field in an examination space configured to receive an object to be examined,a gradient system to generate temporary magnetic gradient fields in the examination space,a control module including a sequence controllers configured to control the RF system and the gradient system to produce RF pulses and magnetic gradient pulses to generate magnetic resonance signals, wherein{'sub': 1', '1, 'the sequence controller is configured to apply a steady state FFE gradient echo acquisition sequence to the object in the examination space to produce steady state FFE gradient echo signals from the object and a T-FFE echo acquisition sequence to the object in the examination space to produce T-FFE echo signals from the object,'}{'sub': '1', 'the control module further including an analysis unit configured to detect a difference the FFE gradient echo signals and the T-FFE echo signals and'}{'sub': '1', 'determine whether a metal instrument is present in the object ...

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Номер записи: 58
11-04-2013 дата публикации

Solid-State NMR Spectrometer, Sample Holder Therefor, and Method of Solid-State NMR Spectroscopy

Номер: US20130088232A1
Автор: Kazuyuki Takeda, Kiyonori Takegoshi, Munehiro Inukai, Takashi Mizuno, Yasuto Noda
Принадлежит: Jeol Resonance Inc, KYOTO UNIVERSITY

A high-resolution solid-state NMR spectrometer which can measure a disklike sample. The spectrometer includes: a stator having an air bearing disposed within the static magnetic field, the rotor being disposed in the stator; and an engaging mechanism mounted in a one-end portion of the rotor and detachably holding a sample holder that holds the disklike sample.

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Номер записи: 59
11-04-2013 дата публикации

Gradient coil power supply and a magnetic resonance imaging system

Номер: US20130088234A1
Автор: Cornelis Leonardus Gerardus Ham
Принадлежит: KONINKLIJKE PHILIPS ELECTRONICS NV

A gradient coil power supply ( 100, 812 ) for a magnetic resonance imaging system ( 800 ) comprising: at least two H-bridge circuits ( 104, 106, 108, 200, 202, 204, 206 ); wherein the H-bridge circuits are connected in series; wherein each of the H-bridge circuits supplies voltage of a first polarity when in a first switching state ( 200 ); wherein the each H-bridge circuit supplies voltage of a second polarity when the H-bridge is in a second switching state ( 202 ); wherein each H-bridge circuit supplies no voltage when in a third switching state ( 204 ); wherein each H-bridge circuit supplies no voltage when in a fourth switching state ( 206 ); and a controller ( 814 ) for controlling the switching of the H-bridge circuits, wherein the controller is adapted for: —receiving ( 600, 700 ) a gradient pulse sequence ( 818 ), —creating ( 602, 702 ) a switching plan for controlling the switching of each of the H-bridge circuits, wherein the switching plan comprises controlling the voltage output of the gradient coil power supply by alternating between the first switching state and the second switching state, wherein the switching plan further comprises operating ( 710 ) at least one H-bridge circuit selected from the H-bridge circuits in either the third or fourth switching state for part of the switching plan to cool the H-bridge circuit, —executing ( 604, 704 ) the switching plan.

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Номер записи: 60
18-04-2013 дата публикации

Nmr systems and methods for the rapid detection of analytes

Номер: US20130095494A1
Автор: Lori Anne Neely
Принадлежит: T2 Biosystems Inc

This invention features systems and methods for the detection of analytes, and their use in the treatment and diagnosis of disease.

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Номер записи: 61
25-04-2013 дата публикации

RESONANCE CIRCUIT HAVING A VARIABLE RESONANCE FREQUENCY

Номер: US20130099789A1
Автор: Benslimane Mohamed Yahia, Gravesen Peter
Принадлежит: DANFOSS POLYPOWER A/S

A resonance circuit with a variable resonance frequency provided by a variable capacitor having compliant electrodes arranged on a deformable sheet. When the sheet is deformed the capacitance is varied. Further a sensing element comprising the resonance circuit and a sensing system comprising at least one sensing element, a sending unit and a receiving unit. Suitable for mass production. Provides wireless sensing system being cost effective to manufacture. May be used for low cost products, such as toys. May also be used for monitoring displacements in structures, e.g. cracks in wall structures. Further a positions sensitive pressure sensor with pressure sensors arranged on a two-dimensional structure. 1. A sensing system comprising:one or more sensing elements including a capacitor with a variable capacitance at least one sending unit comprising an antenna being adapted to induce an electromagnetic field, at least within the range of resonance frequencies for at least one of the sensing elements, and/or at least one receiving unit comprising an antenna being adapted to receive a signal generated by at least one of the sensing elements in response to an electromagnetic signal generated by the sending unit.2. The sensing system according to claim 1 , where the sensing element is a resonance circuit comprises:a coil,the capacitor comprising a set of compliant electrodes arranged on a deformable sheet in such a way that deformation of the deformable sheet causes the capacitance of the capacitor to vary, thereby varying the resonance frequency of the resonance circuit.3. The sensing system according to claim 2 , wherein the deformable sheet is made from an elastomeric material.4. The sensing system according to claim 1 , wherein the capacitance of the capacitor is variable across a specific range of capacitances claim 1 , the resonance frequency of the resonance circuit thereby being variable across a specific range of resonance frequencies.5. The sensing system ...

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Номер записи: 62
02-05-2013 дата публикации

ROUTER AND COIL ARRAY FOR ULTRA HIGH FIELD MRI

Номер: US20130106416A1
Автор: Malik Nabeel M., Morich Michael A., Nieman Kevin, Wong Eddy Y., Zhai Zhiyong
Принадлежит: KONINKLIJKE PHILIPS ELECTRONICS N.V.

A router (), for use with magnetic resonance systems (), selectively routes unique excitation signals, generated by a multi-channel radio-frequency (RF) amplifier, over transmission lines (Tx) to any one of a plurality of connection panels () which each accepts at least one RF coil assembly having multiple coil elements (). Each connection panel () includes transceiver ports () for connecting at least one conductor () of the coil elements () to a corresponding transceiver channel (T/R). The router () selectively routes magnetic resonance signals received by the conductors () from the transceiver channels (T/R) to a multi-channel RF receiver (). The coin elements may carry sine-mode currents or uniform currents. 1. A magnetic resonance system , comprising:{'sub': '1', 'a radio-frequency (RF) amplifier which generates a unique Bexcitation signal for each of a plurality of transmission channels (Tx);'}at least one RF coil assembly having multiple coil elements which transmit the generated excitation signal into an examination region and receive magnetic resonance signals therefrom;a plurality of connection panels each of which connects the RF amplifier to the at least one RF coil assembly via transceiver ports, each transceiver port connecting at least one conductor to an individual transmission channel;a router which selectively routes a generated excitation signal via a corresponding transmission channel (Tx) to at least one transceiver port of any of the plurality of connection panels.2. The magnetic resonance system according to claim 1 , wherein each coil element has at least one conductor which operates in a uniform current resonant mode to generate a pair of orthogonal Bmagnetic fields and to receive magnetic resonance signals at corresponding resonant frequencies in an examination region.3. The magnetic resonance system according to claim 1 , wherein each coil element has at least two conductors which operate in distinct resonant modes to generate a pair of ...

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Номер записи: 63
02-05-2013 дата публикации

LOCAL COIL FOR MAGNETIC RESONANCE APPLICATIONS

Номер: US20130106419A1
Автор: Biber Stephan
Принадлежит:

A local coil includes a transmitter, to which magnetic resonance signals are supplied and which modulates a carrier signal oscillating at a carrier frequency using the magnetic resonance signals. The local coil includes a transmitting antenna, to which the modulated carrier signal is supplied and which sends the modulated carrier signal in a beam to a control and evaluation device of a magnetic resonance system. The beam has a mean direction of radiation. In a vertical plane containing the mean direction of radiation, the beam covers a vertical angle, and in a transverse plane containing the mean direction of radiation and running orthogonally to the vertical plane, the beam covers a transverse angle. The local coil includes an adjusting device that adjusts the mean direction of radiation independently of the orientation of the local coil relative to the vertical. 1. A local coil for magnetic resonance applications , the local coil comprising:a plurality of receiving antennae operable to receive magnetic resonance signals excited by an excitation signal in an object to be examined;a transmitter, to which the magnetic resonance signals are supplied, the transmitter operable to modulate a carrier signal oscillating at a carrier frequency using the magnetic resonance signals;a transmitting antenna, to which the modulated carrier signal is supplied, the transmitting antenna operable to send the modulated carrier signal in a beam to a control and evaluation device of a magnetic resonance system,wherein the beam has a mean direction of radiation,wherein in a vertical plane containing the mean direction of radiation, the beam covers a vertical angle and in a transverse plane containing the mean direction of radiation and running orthogonally to the vertical plane, the beam covers a transverse angle, and wherein the local coil further comprises an adjusting device that always adjusts the mean direction of radiation independently of an orientation of the local coil relative ...

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Номер записи: 64
02-05-2013 дата публикации

MAGNETIC RESONANCE IMAGING GRADIENT COIL, MAGNET ASSEMBLY, AND SYSTEM

Номер: US20130106420A1
Автор: Overweg Johannes Adrianus
Принадлежит: KONINKLIJKE PHILIPS ELECTRONICS N.V.

A magnetic resonance imaging magnet assembly () comprising: a magnet () adapted for generating a main magnetic field for aligning the magnetic spins of nuclei of a subject () located within an imaging volume (); and a gradient coil () for generating a gradient magnetic field for spatial encoding of the magnetic resonance signal of spins of nuclei within the imaging volume, wherein the gradient coil is adapted to be mounted into the magnet, wherein the gradient coil comprises: a first gradient coil section (), wherein the first gradient coil section comprises a first rigid element (), a second gradient coil section (), wherein the second gradient coil section also comprises a second rigid element (), a connecting element () for joining the two half gradient coils, wherein the connecting element comprises an elastic material (), wherein the elastic material is in contact with the first rigid element and the second rigid element. 1. A magnetic resonance imaging magnet assembly comprising:a magnet adapted for generating a main magnetic field for aligning the magnetic spins of nuclei of a subject located within an imaging volume; anda gradient coil for generating a gradient magnetic field for spatial encoding of the magnetic resonance signal of spins of nuclei within the imaging volume, wherein the gradient coil is adapted to be mounted into the magnet, wherein the gradient coil comprises:a first gradient coil section, wherein the first gradient coil section comprises a first rigid element,a second gradient coil section, wherein the second gradient coil section also comprises a second rigid element,a connecting element for joining the two half gradient coils, wherein the connecting element comprises an elastic material, wherein the elastic material is disposed where the two half gradient coils join and is in contact with the first rigid element and the second rigid element.2. The magnetic resonance imaging magnet assembly of claim 1 , wherein both the first and second ...

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Номер записи: 65
09-05-2013 дата публикации

Magnetic resonance imaging apparatus

Номер: US20130113486A1
Автор: Masao Yui, Naho IMAMURA
Принадлежит: Toshiba Corp, Toshiba Medical Systems Corp

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.

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Номер записи: 66
16-05-2013 дата публикации

Magnetic Resonance Tomography System, Receive Apparatus and Method

Номер: US20130119982A1
Автор: Pirkl Georg
Принадлежит:

A magnetic resonance tomography (MRT) system has a receive apparatus disposed in a magnetic field, in which a receive coil is coupled to an input of an analog/digital converter. The analog/digital converter is configured for this purpose. A digital output of the analog/digital converter is coupled via a digital mixer device and a clock-rate-reduction device to a data output of the receive apparatus. The mixer device is configured to mix a predetermined frequency band of the MR signal downwards into an intermediate frequency range and create a digital IF signal. 1. A magnetic resonance tomography (MRT) system comprising:a device for creating a magnetic field, through which a magnetic resonance is creatable in a body; anda receive apparatus disposed in the magnetic field, at least one receive coil of the receive apparatus configured for receiving an MR signal of the body being coupled to an input of an analog/digital converter,wherein the analog/digital converter is configured to convert the MR signal into a digital MR signal,wherein a digital output of the analog/digital converter is coupled via a digital mixer device and a clock rate reduction device to a data output of the receive apparatus, andwherein the digital mixer device is configured to mix a predetermined frequency band of the MR signal downwards into an intermediate frequency range and to generate a digital intermediate frequency (IF) signal.2. The MRT system as claimed in claim 1 , wherein the clock rate reduction device has a fixed reduction factor.3. The MRT system as claimed in claim 2 , wherein the fixed reduction factor comprises a whole-number reduction factor.4. The MRT system as claimed in claim 3 , wherein the clock rate reduction device is operable to output every sixth or eighth received input value as an output value.5. The MRT system as claimed in claim 1 , wherein the digital mixer device includes a weighting device configured to generate consecutive output values as the IF signal claim 1 , ...

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Номер записи: 67
16-05-2013 дата публикации

Spatially Coincident MRI Receiver Coils and Method For Manufacturing

Номер: US20130119987A1
Автор: Felmlee Joel P.
Принадлежит:

A magnetic resonance imaging receiver coil provides for high SNR and high uniformity over a range of loading conditions with layers, or stacks, of independent conductive elements. The plurality of layers preload the receiver coil reducing the circuit variation as the subject coupling and loading varies. The preload is such that coil performance, or SNR, is maintained over a large range of impedance variation. This configuration is designed to exceed the performance of single trace coils over a range of impedance consistent with variations associated with different subjects, and may also incorporate coils of different resonance frequencies. 1. A radio frequency (RF) coil for use with a magnetic resonance system , the RF coil comprising:a plurality of electrically independent conductor elements, each conductor element extending in a different one of a similar plurality of adjacent planes each separated by a separation distance that is selected to adjust inductive coupling between the plurality of electrically independent conductor elements; andan electrical connector for coupling each of the plurality of conductor elements to a magnetic resonance system.2. The RF coil as recited in in which the electrical connector is configured such that each of the plurality of conductor elements are individually coupled to the magnetic resonance system.3. The RF coil as recited in in which some of the plurality of conductor elements are tuned to a first resonance frequency and others of the plurality of coil conductor elements are tuned to a second resonance frequency.4. The RF coil as recited in further comprising a substrate on which each of the plurality of conductor elements is disposed.5. The RF coil as recited in in which the substrate comprises a plurality of printed circuit boards.6. The RF coil as recited in in which each of the plurality of printed circuit boards has disposed thereon a first conductor element on one side of the printed circuit board and a second conductor ...

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Номер записи: 68
16-05-2013 дата публикации

Local Coil

Номер: US20130119988A1
Автор: Driemel Daniel, Greim Helmut, Wolf Steffen
Принадлежит:

A local coil for a magnetic resonance tomography device includes a plurality of antenna elements. Each antenna element of the plurality of antenna elements has two conductor tracks. The conductor tracks are disposed on opposite sides of an insulator and are connected electrically conductively to one another by plated through-holes through the insulator. In areas, in which conductor tracks of at least two antenna elements of the plurality of antenna elements cross, at least one antenna element of the at least two antenna elements only has a conductor track on one side of the insulator. 1. A local coil for a magnetic resonance tomography device , the local coil comprising:a plurality of antenna elements,wherein an antenna element of the plurality of antenna elements has two conductor tracks that are disposed on opposite sides of an insulator and are connected electrically-conductively to one another by plated through-holes through the insulator, andwherein in at least one area, in which conductor tracks of at least two antenna elements of the plurality of antenna elements cross, at least one antenna element of the two antenna elements only has a conductor track on one side of the insulator.2. The local coil as claimed in claim 1 , wherein only in the at least one crossing area of the at least two antenna elements claim 1 , in which the conductor tracks of the at least two antenna elements cross one another claim 1 , at least one antenna element of the at least two antenna elements only has a continuous conductor track on a lower side of the insulator claim 1 , and at least one further antenna element of the at least two antenna elements only has a continuous conductor track on an upper side of the insulator.3. The local coil as claimed in claim 1 , wherein conductor tracks of more than two antennas of the plurality of antennas cross in crossing areas.4. The local coil as claimed in claim 1 , wherein the crossing conductor tracks of a subset of antenna elements of the ...

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Номер записи: 69
16-05-2013 дата публикации

MRT System with a Magnetic Coil and Method for Manufacturing a Circuit Arrangement for Switching a Coil Current

Номер: US20130119989A1
Автор: Albrecht Adam
Принадлежит:

In a magnetic resonance tomography (MRT) system, a current strength of a coil current is controllable by a plurality of semiconductor power switches as a function of a control signal. The plurality of semiconductor power switches receive the control signal at respective control inputs from a control line. In each of at least two semiconductor power switches of the plurality of semiconductor power switches, a compensation resistance element is connected between the control input and the control line. Resistance values of the compensation resistance elements are different. 1. A magnetic resonance tomography (MRT) system comprising:at least one magnetic coil for producing a magnetic resonance, a current strength of a coil current in the at least one magnetic coil being controllable by a plurality of semiconductor power switches as a function of a control signal,wherein the plurality of semiconductor power switches is operable to receive the control signal at a respective control input from a control line, andwherein in each of at least two semiconductor power switches of the plurality of semiconductor power switches, a compensation resistance element is connected between the control input and the control line, and resistance values of the compensation resistance elements are different.2. The MRT system as claimed in claim 1 , wherein at least one compensation resistance element is connected immediately in front of a terminal of an electronic component that an associated semiconductor power switch of the plurality of semiconductor power switches includes.3. The MRT system as claimed in claim 1 , wherein the resistance values are selected such that claim 1 , during operation of the MRT system claim 1 , for a prespecified curve of the control signal claim 1 , current strengths of part currents claim 1 , of which each flows through a semiconductor power switch of the plurality of semiconductor power switches and which together form the coil current claim 1 , have a smaller ...

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Номер записи: 70
16-05-2013 дата публикации

HIGH-FREQUENCY COIL AND MAGNETIC RESONANCE IMAGING DEVICE EMPLOYING SAME

Номер: US20130119991A1
Автор: Bito Yoshitaka, Habara Hideta, Ochi Hisaaki, Soutome Yoshihisa, Takahashi Tetsuhiko, Takeuchi Hiroyuki
Принадлежит:

A technique is provided to reserve large examination space in the tunnel type MRI apparatus, without increasing production cost nor reducing significantly irradiation efficiency and homogeneity in an irradiation distribution within an imaging region. The present invention provides an RF coil unit in which four partial cylindrical coils are placed with a gap therebetween in the circumferential direction inside a cylindrical RF shield, in such a manner that two pairs of the partial cylindrical coils are opposed to each other, and magnetic fields produced by the individual partial cylindrical coils are combined, thereby producing a circularly polarized wave field or an elliptically polarized wave field. The partial cylindrical coil is provided with a partial cylindrical conductor, multiple first conductors substantially parallel with the central axis of the RF shield, multiple capacitors connecting both ends of the first conductors with the partial cylindrical conductor, and a second conductor adjacent to at least one of the ends of the first conductor. The partial cylindrical coils are respectively provided with high frequency signals having a desired amplitude ratio and phase difference, while a reference frequency thereof being identical. 1. A high frequency coil comprising , a cylindrical RF shield , a first high frequency coil , and a second high frequency coil ,the first high frequency coil and the second high frequency coil being placed with a gap therebetween in a circumferential direction inside the RF shield, each of the first high frequency coil and the second high frequency coil being provided with two partial cylindrical coils opposed to each other placing a central axis of the RF shield therebetween, andeach of the partial cylindrical coils comprising,a partial cylindrical conductor sharing the central axis,multiple first conductors being placed inside the partial cylindrical conductor and substantially parallel to the central axis,multiple first ...

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Номер записи: 71
16-05-2013 дата публикации

RE-CONDENSATION DEVICE AND NMR ANALYSIS DEVICE PROVIDED THEREWITH

Номер: US20130123110A1
Автор: Miki Takashi
Принадлежит: Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)

A re-condensation device allows an NMR analysis device to be reduced in overall size and minimizes heat penetration into a liquid helium tank. An NMR analysis device provided with said re-condensation device. The re-condensation device includes: a second cooling member, part of which is inserted into a neck tube, and which re-condenses liquid helium; and a first cooling member, part of which is inserted into the neck tube. The second cooling member is thermally connected to a chiller's second cooling stage, and the first cooling member is thermally connected to the chiller's first cooling stage. The first cooling member has: a first insertion part, which has a diameter that allows insertion into the neck tube; and an inside contact part on the outer surface of the first insertion part and that cools heat seals by contacting, from the inside, a part of the neck tube that outside contact parts contact. 1. A re-condensation device provided in a magnetic field producing unit including a liquid helium tank that contains a superconducting magnet and liquid helium that cools the superconducting magnet , a neck tube that protrudes upward from the liquid helium tank , and at least one covering member that covers the liquid helium tank from an outside of the liquid helium tank and that has an outside contact part that is in thermal contact with the neck tube from an outside of the neck tube , the re-condensation device re-condensing the liquid helium , the re-condensation device comprising:a chiller that includes a first cooling stage and a second cooling stage, a temperature of the second cooling stage being decreased to a temperature lower than a temperature of the first cooling stage;a second cooling member that is thermally connected to the second cooling stage, at least a portion of the second cooling member being inserted into the neck tube so as to re-condense the liquid helium; anda first cooling member that is thermally connected to the first cooling stage, at least ...

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Номер записи: 72
23-05-2013 дата публикации

MRT System, Receive Apparatus for an MRT System and Method for Obtaining an MR Signal in an MRT System

Номер: US20130127461A1
Автор: Popescu Stefan
Принадлежит:

A receive apparatus in a strong magnetic alternating field is disposed in a magnetic resonance tomography (MRT) system. The MRT system includes at least one receive apparatus for a magnetic resonance high frequency (MR-HF) signal. The receive apparatus includes a receive coil element for receiving the MR-HF signal, an optical modulator, in which an electrical control input is coupled to the receive coil element, and an optical output for outputting an output signal of the modulator. The optical modulator forms an optical demodulation device for the MR-HF signal. The optical modulator is coupled to a laser light source via an optical input that is configured to generate a laser light. A light intensity of the laser light varies periodically with a predetermined frequency. 1. A magnetic resonance tomography (MRT) system comprising:at least one receive apparatus for a magnetic resonance high frequency (MR-HF) signal, wherein the at least one receive apparatus comprises a receive coil element for receiving the MR-HF signal;an optical modulator, in which an electrical control input is coupled to the receive coil element; andan optical output operable to output an output signal of the optical modulator,wherein the optical modulator is operable to optically demodulate the MR-HF signal, and an optical input of the optical modulator is coupled to a laser light source that is configured to generate a laser light, a light intensity of the laser light varying periodically with a predetermined frequency.2. The MRT system as claimed in claim 1 , wherein the laser light source is arranged outside of the at least one receive apparatus claim 1 , and the laser light is transmittable via a light guiding device to the at least one receive apparatus.3. The MRT system as claimed in claim 1 , further comprising an opto-electronic converter claim 1 , using which the optical output signal of the optical modulator is convertible into an electrical signal claim 1 ,wherein the opto-electronic ...

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Номер записи: 73
23-05-2013 дата публикации

Magnetic Resonance Antenna Arrangement and Magnetic Resonance System

Номер: US20130127463A1
Автор: Matschl Volker, Nistler Juergen
Принадлежит:

A magnetic resonance antenna arrangement includes at least one first antenna group including individually-controllable first antenna conductor loops and a second antenna group adjacent to the first antenna group. The second antenna group includes individually-controllable, longitudinal second antenna elements. The first antenna conductor loops essentially extend in a first extending surface and are disposed in the first extending surface in a first direction in a row behind one another. The longitudinal second antenna elements extend with the longitudinal axes transverse to the first direction disposed in parallel next to one another in a second extending surface that runs essentially in parallel to the first extending surface. Each of the second antenna elements are coupled at first and second end areas to a conductive element to form a second conductor loop with the conductive element. The second antenna elements are disposed to overlap an adjacent first antenna loop in each case. 1. A magnetic resonance antenna arrangement comprising:at least one first antenna group comprising a plurality of first antenna conductor loops, the plurality of first antenna conductor loops being individually-controllable; anda second antenna group adjacent to the at least one first antenna group, the second antenna group comprising a plurality of longitudinal second antenna elements, the plurality of longitudinal second antenna elements being individually-controllable,wherein the plurality of first antenna conductor loops essentially extend in a first extending surface and are arranged in the first extending surface in a first direction in a row behind one another,wherein the plurality of longitudinal second antenna elements are disposed with longitudinal axes transverse to the first direction in parallel next to one another and extend in a second extending surface that runs essentially in parallel to the first extending surface,wherein the plurality of longitudinal second antenna ...

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Номер записи: 74
23-05-2013 дата публикации

SYSTEMS AND METHODS FOR ASSESSMENT OF OXYGENATION

Номер: US20130127466A1
Автор: Gupta Samit Kumar, Kuppusamy Periannan, Rushenberg Robert Lawrence
Принадлежит: 02 Insights, Inc.

A scanner for assessing localized oxygenation of a desired region of interest includes a handheld housing having a proximal end and a distal end. A resonator coil is disposed within the housing and also disposed adjacent the distal end of the housing. The resonator coil is configured to both excite and read paramagnetic materials. A magnet is disposed within the housing and also disposed adjacent the distal end of the housing. The magnet is configured to provide a substantially uniform magnetic field over the desired region of interest. The scanner is configured to use electron paramagnetic resonance to assess localized oxygenation in the desired region. 1. A scanner for assessing localized oxygenation of a desired region of interest , said scanner comprising:a handheld housing having a proximal end and a distal end;a radio frequency bridge assembly disposed within the housing and disposed adjacent the distal end of the housing, the radio frequency bridge assembly configured to both generate electromagnetic signals and measure electron paramagnetic resonance signals; anda magnet assembly disposed within the housing and disposed adjacent the distal end of the housing, the magnet assembly configured to provide a substantially uniform magnetic field over the desired region of interest,wherein the scanner is configured to use continuous wave electron paramagnetic resonance to assess localized oxygenation in the desired region.2. A system for assessing localized oxygenation of a desired region of interest comprising the scanner of claim 1 , wherein the desired region is operatively coupled to a paramagnetic probe.3. The scanner of claim 1 , where in the radio frequency bridge comprises at least one of the following: an oscillator claim 1 , an attenuator claim 1 , a circulator claim 1 , a resonator claim 1 , a detector claim 1 , a reference arm claim 1 , a pre-amplifier claim 1 , an automatic frequency controller claim 1 , a SAW oscillator claim 1 , or a tuning display.4. ...

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Номер записи: 75
23-05-2013 дата публикации

MAGNETIC RESONANCE IMAGING APPARATUS AND MAGNETIC RESONANCE IMAGING METHOD

Номер: US20130127467A1
Автор: IMAMURA Naoki, KANAZAWA Hitoshi, KAWAJIRI Sho, KOBUCHI Kanta, YAMANAKA Masaaki, YOKOI Motohisa
Принадлежит:

According to one embodiment, a magnetic resonance imaging apparatus includes a mode switching part and an imaging system. The mode switching part is configured to put a circuit system consuming a power into a shutdown state when a first trigger has been detected and put the circuit system being the shutdown state into a startup state when a second trigger has been detected. The first trigger shows that an imaging does not start for a certain period. The second trigger shows that the imaging starts. The imaging system is configured to perform the imaging by using the circuit system being the startup state. 1. A magnetic resonance imaging apparatus comprising:a mode switching part configured to put a circuit system consuming a power into a shutdown state when a first trigger has been detected and put the circuit system being the shutdown state into a startup state when a second trigger has been detected, the first trigger showing that an imaging does not start for a certain period, the second trigger showing that the imaging starts; andan imaging system configured to perform the imaging by using the circuit system being the startup state.2. A magnetic resonance imaging apparatus comprising:a mode switching part configured to put a circuit system consuming a power into a shutdown state when a first trigger has been detected and put the circuit system being the shutdown state into a startup state when a second trigger has been detected, the first trigger showing that a height of a table of a bed has become not more than a threshold or less than the threshold, the second trigger showing that the imaging starts; andan imaging system configured to perform the imaging by using the circuit system being the startup state.3. A magnetic resonance imaging apparatus of claim 1 ,wherein said mode switching part is configured to detect the first trigger and the second trigger based on at least one of a position of a table of a bed and an operating information input from an input ...

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Номер записи: 76
23-05-2013 дата публикации

Gradient-Independent Shim Coil for a Local Coil of a Magnetic Resonance Device

Номер: US20130127468A1
Автор: Biber Stephan
Принадлежит:

A shim coil device for installation and/or arrangement within a local coil of a magnetic resonance device is provided. The shim coil device includes at least one shim coil formed by at least one conductor loop, and at least one compensation coil formed by at least one conductor loop. The at least one shim coil and the at least one compensation coil are arranged in a same coil plane. An overall arrangement of the at least one shim coil and the at least one compensation coil is symmetrical about a first central axis and a second central axis. The first central axis and the second central axis are perpendicular to each other and lie in the coil plane. An overall induction surface is enclosed by the at least one conductor loop of the at least one compensation coil corresponding to an overall induction surface enclosed by the at least one conductor loop of the at least one shim coil. 1. A shim coil device for a magnetic resonance device , the shim coil device , comprising:at least one shim coil formed by at least one conductor loop; andat least one compensation coil formed by at least one conductor loop,wherein the at least one shim coil and the at least one compensation coil are arranged in a same coil plane, and an overall arrangement of the at least one shim coil and the at least one compensation coil is symmetrical about a first central axis and a second central axis of the coil plane, andwherein the first central axis and the second central axis are perpendicular to each other and lie in the coil plane, and an overall induction surface is enclosed by the at least one conductor loop of the at least one compensation coil corresponding to an induction surface enclosed by the at least one conductor loop of the at least one shim coil.2. The shim coil device of claim 1 , wherein the shim coil device is arranged within a local coil so that a central plane containing the first central axis is perpendicular to the second central axis and contains the isocenter of the ...

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Номер записи: 77
23-05-2013 дата публикации

Local Coil

Номер: US20130127469A1
Автор: Biber Stephan, Jahns Karsten, Kundner Thomas, Rothard Joerg
Принадлежит:

A local coil for an imaging system includes an anterior torso part and a posterior torso part that are detachably connected to one another with a fastening device. 1. A local coil for an imaging system , the local coil comprising:an anterior torso part; anda posterior torso part,wherein the anterior torso part and the posterior torso part are connected to one another, andwherein the anterior torso part and the posterior torso part are detachably connected to one another with a fastener.2. The local coil as claimed in claim 1 , wherein the local coil is a magnetic resonance tomography (MRT) local coil.3. The local coil as claimed in claim 1 , wherein the anterior torso part and the posterior torso part claim 1 , in a state resting on a patient or dummy claim 1 , are connected to one another.4. The local coil as claimed in claim 1 , wherein the local coil is configured as a piece of upper body clothing.5. The local coil as claimed in claim 1 , wherein the local coil is in the form of a vest that surrounds part of the torso of a patient.6. The local coil as claimed in claim 5 , wherein the vest is a sleeveless vest.7. The local coil as claimed in claim 1 , wherein the local coil is in the form of a wearable jacket with or without sleeves.8. The local coil as claimed in claim 1 , wherein the local coil is in the form of a piece of upper body clothing that surrounds the body of a patient or a dummy when worn anterior in a chest region claim 1 , in an abdominal region claim 1 , or in the chest region and in the abdominal region.9. The local coil as claimed in claim 1 , wherein the local coil is in the form of a piece of upper body clothing that surrounds the body of a patient or dummy when worn as a piece of clothing in a chest region claim 1 , in an abdominal region claim 1 , or in the chest region and in the abdominal region along a periphery about a longitudinal axis of the body.10. The local coil as claimed in claim 1 , further comprising a fastener for connecting an ...

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Номер записи: 78
23-05-2013 дата публикации

Switched-mode power supply apparatus and method

Номер: US20130127532A1
Автор: Hendrik Huisman
Принадлежит: KONINKLIJKE PHILIPS ELECTRONICS NV

The present invention relates to a switched-mode power supply apparatus and a corresponding method. For an effective compensation of non-linearities caused by dead-time and voltage drops in the switching power amplifier of the apparatus, an apparatus is proposed comprising a switching power amplifier ( 14 ) for amplifying a signal supplied by an external signal source ( 11 ) and for supplying a load voltage and/or load current to a load ( 15 ), and a control unit ( 12; 12 b ) for controlling the switching of said switching power amplifier based on a timing setting, said control unit being adapted for simulating the behavior of the switching power amplifier by predicting the average load voltage and/or load current for at least two, in particular a plurality of, timing settings for a desired load voltage and/or load current based on state information about the present state of the switching power amplifier.

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Номер записи: 79
30-05-2013 дата публикации

Method for Determining a Control Sequence with Parallel Transmission

Номер: US20130134973A1
Автор: Hans-Peter Fautz
Принадлежит: Individual

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.

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Номер записи: 80
30-05-2013 дата публикации

COMBINATION OF MR MEASUREMENT SIGNALS IN ORDER TO IMPROVE THE SIGNAL-TO-NOISE RATIO

Номер: US20130134974A1
Автор: Heid Oliver
Принадлежит:

In a computerized method, a magnetic resonance system, and a data storage medium encoded with programming instructions, n magnetic resonance (MR) signals are provided to a processor and, in the processor, a combination of the n associated MR signals is formed by calculating a median of the n associated MR signals, as an ideal MR signal. The ideal MR signal is then either stored or used for further processing. 111.-. (canceled)12. A method for computerized , automated evaluation of magnetic resonance (MR) measurement signals , comprising:supplying n associated MR measurement signals to an input of a processor;in said processor, combining the n associated MR measurement signals by calculating a medium of n associated MR measurement signals, as an ideal MR measurement signal; andmaking said ideal MR measurement signal available in electronic form at an output of said processor.13. A method as claimed in comprising supplying said ideal MR measurement signal from said output of said processor to an electronic memory claim 12 , and storing said ideal MR measurement signal in said electronic memory.14. A method as claimed in comprising calculating said median as a median selected from the group consisting of an upper median claim 12 , a lower median claim 12 , and a conventional median.15. A method as claimed in comprising providing image data to said input of said processor as said n associated MR measurement signals.16. A method as claimed in comprising providing said image data to said input of said processor as individual MR images or a series of MR images.17. A method as claimed in comprising providing said image data to said input of said processor as image data of a series of MR images.18. A method as claimed in comprising providing said image data to said input of said processor as image data of an associated group of MR images of a series of MR images.19. A method as claimed in comprising providing said image data to said input of said processor with said ...

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Номер записи: 81
30-05-2013 дата публикации

Balancing Out a Field Inhomogeneity in a Magnetic Resonance Tomography System and Shim Coil Arrangement

Номер: US20130134978A1
Автор: Biber Stephan
Принадлежит:

In order to balance out a field inhomogeneity, a value for a coil current is determined by a controller as a function of an item of information relating to the field inhomogeneity and an item of information relating to a position of at least one balancing or shim coil arranged in the magnetic field. The value is to be supplied to the at least one shim coil in order to generate a magnetic balancing field to balance out the field inhomogeneity. A control signal for at least one shim current source and for at least one switching matrix coupling the at least one shim current source to the at least one shim coil is generated as a function of the at least one value. 1. A magnetic resonance tomography (MRT) system comprising:a controller configured to generate a control signal as a function of information relating to a field inhomogeneity of a magnetic field of the MRT system; andat least one controllable shim current source that is coupled to the controller, the at least one controllable shim current source being configured to generate a coil current as a function of the control signal,wherein the at least one shim current source is coupled to a plurality of shim coil connections via a controllable switching matrix, at least one shim coil being connectable to each shim coil connection of the plurality of shim coil connections in order to generate a magnetic balancing field.2. The MRT system as claimed in claim 1 , wherein the number of shim coil connections is greater than the number of shim current sources.3. The MRT system as claimed in claim 1 , wherein the at least one controllable shim current source comprises at least two shim current sources claim 1 , the at least two shim current sources differing in terms of a maximum generateable current strength claim 1 , a setting accuracy for a current strength claim 1 , a switching bandwidth claim 1 , or a combination thereof.4. The MRT system as claimed in claim 1 , wherein the at least one controllable shim current source ...

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Номер записи: 82
30-05-2013 дата публикации

Volume Array Coil with Enforced Uniform Element Currents for Improved Excitation Homogeneity

Номер: US20130134979A1
Автор: McDougall Mary P., Wright Steven M.
Принадлежит: The Texas A&M University System

Each of the coils in a transmit coil array of a magnetic resonance imaging apparatus is electrically connected to a common voltage point by a transmission line. By controlling the electrical length of the transmission line connecting each of the coils to the common voltage point to an odd integer multiple of one quarter wavelength, the current delivered to each coil is independent of coil impedance. This principle of forced current excitation enables equal currents to be delivered to each coil of a magnetic resonance imaging transmit coil array regardless of the unique loading of the individual coils and mutual impedance between the coils. 1. An imaging apparatus , comprising:an electromagnet configured to generate a first static magnetic field in a volume of tissue to be imaged;a radio frequency signal generator configured to generate a signal at a common node;a plurality of transmit coils arranged in an array, each coil having an input terminal; anda plurality of transmission line segments, each transmission line segment configured to conduct the signal from the common node to the input terminal of one of the coils, wherein each of the transmission line segments has a length that is equal to an odd integer multiple of one quarter of a wavelength of the signal in the transmission line segment,wherein the array is configured to surround the volume of tissue and to produce a radio frequency magnetic field in the volume of tissue.2. The imaging apparatus of claim 1 , wherein the first static magnetic field has a first static magnetic field strength.3. The imaging apparatus of claim 2 , wherein the signal has a frequency that corresponds to a resonance frequency of a first atomic nucleus in the tissue at the first static magnetic field strength.4. The imaging apparatus of claim 1 , wherein each of the plurality of transmission line segments comprises a coaxial cable.5. The imaging apparatus of claim 1 , wherein a first one of the plurality of transmission line segments ...

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Номер записи: 83
06-06-2013 дата публикации

Nmr spectroscopy device based on resonance type impedance (ir) sensor and method of nmr spectra acquisition

Номер: US20130141095A1
Автор: Yury Nikolenko
Принадлежит: NeoVision LLC

Processes and apparatuses are provided for contactless Nuclear magnetic resonance (“NMR”) spectrum acquiring and spectroscopic analysis and/or measuring or monitoring, in-line, in-situ and/or in real time, at least one composition or object under test of one or more solid, liquid, and/or gaseous substances and/or one or more bulk materials. One or more apparatus may include a resonance type impedance sensor having at least two coils, at least one coil of the at least two coils being at least one excitation coil, at least one other coil of the at least two coils being at least one sensing coil. The method(s) involve acquiring an NMR spectrum of an object under test while changing at least one of the frequency of an IR sensor and the intensity of the magnetic field applied to an object under test and/or sweeping intensity of the magnetic field applied to the object under test.

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Номер записи: 84
13-06-2013 дата публикации

Method for Monitoring Patient Exposure in a Magnetic Resonance Device

Номер: US20130147479A1
Автор: Bielmeier Wolfgang, Gebhardt Matthias, Nistler Juergen, Ritter Dieter, Schnetter Volker
Принадлежит:

A method for monitoring an exposure experienced by a patient during an examination with a magnetic resonance device having a transmitter device is provided. The method includes determining a coil power loss from measured amplitudes and phases of a first measuring device, and determining an overall transmitted power from voltage measurement values of the second measuring device. The method also includes determining a specific absorption rate (SAR) value describing a power entering a patient from the coil power loss and the overall transmitted power and comparing the SAR value with at least one limit value. A transmission operation of the transmitter device is terminated if the at least one limit value is exceeded. 1. A method for monitoring patient exposure during an examination with a magnetic resonance device , the magnetic resonance device comprising a transmitter device with a high-frequency coil that is actuatable via a plurality of transmission channels , at least two power amplifiers being used to supply power the plurality of transmission channels , wherein for each transmission channel of the plurality of transmission channels , a narrowband first measuring device configured to measure an amplitude and a phase of a voltage in a defined frequency range around a magnetic resonance frequency and a broadband second measuring device covering a wider frequency range than the first measuring device and configured to record voltage measurement values suitable for determining an overall power are used , the method comprising:determining a coil power loss from the measured amplitude and the measured phase of the first measuring device;determining an overall transmitted power from the voltage measurement values of the second measuring device;determining a specific absorption rate (SAR) value describing a power entering a patient from the coil power loss and the overall transmitted power and comparing the SAR value with at least one limit value; andterminating a ...

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Номер записи: 85
13-06-2013 дата публикации

MAGNETIC RESONANCE IMAGING APPARATUS AND VIBRATIONAL ERROR MAGNETIC FIELD REDUCTION METHOD

Номер: US20130147481A1
Автор: Miyawaki Shouichi, Takeuchi Hiroyuki
Принадлежит:

Regardless of the measurement conditions, the degradation of the image quality due to a vibrational error magnetic field, which is generated by the vibration of the mechanical structure of an MRI apparatus, is reduced. In order to do so, error magnetic field image data indicating an error magnetic field distribution is acquired on the basis of an echo signal measured using a pulse sequence having a test gradient magnetic field, a parameter value of a damped vibration function showing a vibrational error magnetic field is calculated using the error magnetic field image data, and a correction magnetic field is calculated on the basis of the calculated parameter value of the damped vibration function showing the vibrational error magnetic field. 1. A magnetic resonance imaging apparatus comprising:a static magnetic field generation unit that generates a static magnetic field in imaging space;a gradient magnetic field generation unit that generates a gradient magnetic field so as to be superimposed on the static magnetic field;a correction magnetic field generation unit that generates a correction magnetic field for correcting an error magnetic field generated in the imaging space due to application of the gradient magnetic field;a structural unit that supports the static magnetic field generation unit, the gradient magnetic field generation unit, and the correction magnetic field generation unit mounted inside;a measurement control unit that measures an echo signal from an object disposed in the imaging space on the basis of a predetermined pulse sequence; anda correction magnetic field calculation unit that calculates a correction magnetic field for correcting an error magnetic field generated in the imaging space due to application of the gradient magnetic field,wherein the correction magnetic field calculation unit calculates an error magnetic field including a vibrational error magnetic field based on vibration of the structural unit due to application of the ...

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Номер записи: 86
13-06-2013 дата публикации

METHOD AND APPARATUS FOR VARYING ADAPTIVELY PULSE INTERVAL IN NMR-BASED WATER CONTENT MEASUREMENT

Номер: US20130147482A1
Автор: Viitanen Veli-Pekka, Virtanen Sami
Принадлежит: METSO AUTOMATION OY

The invention relates to a NMR method for determining moisture content of a sample, in which method a sample is objected to a magnetic DC-field, the sample under magnetic DC-field is objected to a sequence of excitation pulses in RF-frequency with pulse interval for exciting hydrogen nuclei, and NMR signal of the excited hydrogen nuclei is measured. In accordance with the invention spin-lattice relaxation time is estimated for the sample, and pulse interval is adjusted longer than the estimated spin-lattice relaxation time. 1. A NMR method for determining moisture content of a sample , in which methoda sample is objected to a magnetic DC-field,the sample under magnetic DC-field is objected to a sequence of excitation pulses in RF-frequency with pulse interval for exciting hydrogen nuclei, andNMR signal of the excited hydrogen nuclei is measured,whereinestimating spin-lattice relaxation time for each sample on the basis of response to the sequence of excitation pulses, andadjusting the pulse interval at its minimum while keeping the pulse intervallonger than the estimated spin-lattice relaxation time.2. A method in accordance with claim 1 , wherein the pulse interval is adjusted to be more than five times the spin-lattice relaxation time.3. A method in accordance with claim 1 , wherein the estimation of spin-lattice relaxation time is done by measuring the NMR signal (amplitude) using successive excitation pulse sequences with a constant number of pulses and a stepwise increasing pulse interval claim 1 , and detecting the minimum interval required for the signal to remain essentially at its maximum value.4. A method in accordance with claim 1 , wherein the spin-spin relaxation time is determined either directly or indirectly and spin-lattice relaxation time is estimated from the spin-spin relaxation time.52. A method in accordance with claim 4 , wherein by estimating the spin-spin relaxation time based on a measured value of T* claim 4 , which is a combined result of ...

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Номер записи: 87
13-06-2013 дата публикации

Magnetic resonance imaging apparatus and multi-echo multi-contrast imaging method

Номер: US20130147483A1
Автор: Norihiko Ozawa, Shinji Kurokawa, Takayuki Abe
Принадлежит: Hitachi Medical Corp

In multi-echo multi-contrast imaging, the image quality is improved by suppressing an increase in imaging time. In order to do so, the arrangement order of echo signals that form an echo train and k space filled with each echo signal are determined such that the continuity of the echo arrangement is maintained while sharing an echo signal between contrasts in multi-echo multi-contrast imaging. Echo trains that perform echo sharing are arranged in non-oscillatory centric view ordering (NOCO). In addition, the starting point of echo sharing of one echo train is connected to the same position of another echo train. When some discontinuous regions are present, the discontinuous regions may be corrected using continuous data of regions symmetrical thereto on the k space.

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Номер записи: 88
13-06-2013 дата публикации

Method and apparatus for characterizing and optimizing an rf coil in a magnetic resonance imaging system

Номер: US20130147484A1
Автор: Bijay Kamleshbhai Shah, Eddy Benjamin Boskamp, Ricardo Becerra
Принадлежит: General Electric Co

An MRI apparatus includes a magnetic resonance imaging (MRI) system having a plurality of gradient coils positioned about a bore of a magnet, an RF coil assembly having at least a first port and a second port, an RF transceiver system having a pulse module and configured to transmit RF signals to the first port and the second port, and a computer programmed to drive the RF coil assembly in quadrature through the at least first port and the second port, measure a B 1 field using at least one flux probe at two or more angular orientations within the RF coil assembly, and characterize and optimize performance of the MRI system based on the measurements of the B 1 field.

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Номер записи: 89
13-06-2013 дата публикации

MAGNETIC RESONANCE IMAGING APPARATUS

Номер: US20130147485A1
Автор: YOKOI Motohisa
Принадлежит:

A magnetic resonance imaging apparatus includes a superconductive coil unit, a cooling vessel and a plurality of refrigerators. The superconductive coil unit includes a superconductive coil, and a supporter configured to support the superconductive coil. The cooling vessel houses the superconductive coil unit and is free from liquid helium. The plurality of refrigerators are disposed on the superconductive coil unit and cool the superconductive coil unit. 1. A magnetic resonance imaging apparatus , comprising:a superconductive coil unit configured to include a superconductive coil, and a supporter configured to support the superconductive coil;a cooling vessel configured to house the superconductive coil unit and to be free from liquid helium; anda plurality of refrigerators configured to be disposed on the superconductive coil unit and to cool the superconductive coil unit.2. The magnetic resonance imaging apparatus according to claim 1 ,wherein each of the plurality of refrigerators is a cold head that generates cold by expanding a compressed refrigerant gas.3. The magnetic resonance imaging apparatus according to claim 1 ,wherein the plurality of refrigerators are disposed on a bobbin of the superconductive coil unit.4. The magnetic resonance imaging apparatus according to claim 1 ,wherein the plurality of refrigerators are disposed by being arranged on one straight line parallel with an advancing and retracting direction of a bed system on which an object is placed.5. The magnetic resonance imaging apparatus according to claim 1 ,wherein an inside of the cooling vessel is under vacuum.6. The magnetic resonance imaging apparatus according to claim 1 , further comprising:a temperature sensor configured to be disposed on the superconductive coil unit, and to detect a temperature of the superconductive coil unit; anda control unit configured to switch an operation to a remaining refrigerator of the plurality of refrigerators, upon determining that a cooling ability ...

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Номер записи: 90
13-06-2013 дата публикации

Power Amplifier Device for a Magnetic Resonance Machine

Номер: US20130147486A1
Автор: Albrecht Adam
Принадлежит:

A power amplifier device for a magnetic resonance machine includes a housing, in which a first printed circuit board including at least one amplifier module having at least one power electronics component and at least one conductor pattern connected to the power electronics component is arranged. A second printed circuit board including at least one power electronics component and a conductor pattern is also arranged in the housing. The conductor pattern of the second printed circuit board is connected to at least one connection point of the first printed circuit board in order to supply voltage to the amplifier module. At least one cooling duct for cooling the power electronics components is arranged in the housing. At least two of the power electronics components are arranged such that the electronics components are thermally connected to a common cooling duct on opposite sides of the cooling duct. 1. A power amplifier device for a magnetic resonance machine , the power amplifier device comprising:a housing;a first printed circuit board arranged in the housing, the first printed circuit board comprising at least one amplifier module including at least one power electronics component, and at least one conductor pattern connected to the at least one power electronics component;a second printed circuit board arranged in the housing, the second printed circuit board comprising at least one power electronics component and a conductor pattern, the at least one power electronics component and the conductor pattern being assigned to a power supply of a amplifier module, wherein the conductor pattern of the second printed circuit board is connected to at least one connection point of the first printed circuit board in order to supply voltage to the amplifier module; andat least one cooling duct arranged in the housing, the at least one cooling duct being operable to cool the power electronics components,wherein at least two power electronics components of the first printed ...

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Номер записи: 91
20-06-2013 дата публикации

Magnetic resonance imaging apparatus, magnetic field adjustment implement for magnetic resonance imaging apparatus, magnetic resonance imaging method, and method of adjusting magnetic field for magnetic resonance imaging apparatus

Номер: US20130154636A1
Автор: Hidekazu Tanaka, Kazuto Nogami, Shohei Takami, Yoshitomo Sakakura
Принадлежит: Toshiba Corp, Toshiba Medical Systems Corp

According to one embodiment, a magnetic field adjustment implement for a magnetic resonance imaging apparatus includes a magnetic field adjustment unit and a placing unit. The magnetic field adjustment unit is configured to improve a uniformity of a static magnetic field formed by a magnet of the magnetic resonance imaging apparatus. The static magnetic field is formed under an influence of a circumstance in a shield room in which the magnet is placed. The magnetic field adjustment is placed outside the magnet. The placing unit is configured to place the magnetic field adjustment unit outside the magnet.

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Номер записи: 92
20-06-2013 дата публикации

Magnetic resonance imaging apparatus and magnetic resonance imaging method

Номер: US20130154642A1
Автор: Kazuhiro Sueoka
Принадлежит: Toshiba Corp, Toshiba Medical Systems Corp

In one embodiment, an MRI apparatus ( 20 ) includes “a temperature measuring unit ( 70 A to 70 D) performing temperature measurement of a gradient magnetic field coil unit ( 26 )”, a data storing unit ( 100 ), a pulse setting unit ( 102 ), and an imaging unit. The data storing unit stores the first and second data indicating a shift of a center frequency of magnetic resonance of hydrogen atoms. The first data corresponds to a case of temperature rise of the gradient magnetic field coil unit, and the second data corresponds to a case of temperature fall of that. The pulse setting unit corrects a center frequency of an RF pulse by calculating an estimated shift of the center frequency based on data corresponding to result of the temperature measurement out of the first and second data. The imaging unit performs magnetic resonance imaging based on the corrected RF pulse.

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Номер записи: 93
20-06-2013 дата публикации

MAGNETIC RESONANCE IMAGING APPARATUS

Номер: US20130154646A1
Автор: KUHARA Shigehide, Matsumoto Nobuyuki, Nitta Shuhei, Takeguchi Tomoyuki
Принадлежит:

A magnetic resonance imaging apparatus according to an embodiment includes an acquiring unit, a detecting unit, a deriving unit, and an imaging controller. The acquiring unit acquires three-dimensional image data including a target organ. The detecting unit detects an upper end position and a lower end position of the target organ in the three-dimensional image data. The deriving unit derives an imaging range of subsequent imaging performed after acquisition of the three-dimensional image data based on the upper end position and the lower end position of the target organ. The imaging controller controls performance of the subsequent imaging in accordance with the imaging range. 1. A magnetic resonance imaging apparatus comprising:an acquiring unit configured to acquire three-dimensional image data including a target organ;a detecting unit configured to detect an upper end position and a lower end position of the target organ in the three-dimensional image data;a deriving unit configured to derive an imaging range of subsequent imaging performed after acquisition of the three-dimensional image data based on the upper end position and the lower end position of the target organ; andan imaging controller configured to control performance of the subsequent imaging in accordance with the imaging range.2. The apparatus according to claim 1 , whereinthe acquiring unit acquires three-dimensional image data including a heart,the detecting unit detects an upper end position and a lower end position of the heart in the three-dimensional image data,the deriving unit derives the imaging range including the upper end position and the lower end position of the heart, andthe imaging controller controls performance of the imaging for acquiring axial views in accordance with the imaging range.3. The apparatus according to claim 2 , wherein the acquiring unit acquires the three-dimensional image data claim 2 , a read-out direction of the three-dimensional image data being a superior- ...

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Номер записи: 94
20-06-2013 дата публикации

SYSTEM AND APPARATUS FOR COMPENSATING FOR MAGNETIC FIELD DISTORTION IN AN MRI SYSTEM

Номер: US20130154648A1
Автор: Havens Timothy J., Jiang Longzhi, Kidane Tesfaye K., Shen Weijun
Принадлежит: GENERAL ELECTRIC COMPANY

A magnet apparatus for a magnetic resonance imaging system, the magnet apparatus includes a vacuum vessel, a helium vessel disposed within the vacuum vessel and a thermal shield disposed between the vacuum vessel and the helium vessel. A set of passive compensation coils are disposed within the vacuum vessel or the helium vessel and used to compensate for magnetic field distortion caused by mechanical vibrations within the magnet apparatus. 1. A magnet apparatus for a magnetic resonance imaging system , the magnet apparatus comprising:a vacuum vessel;a helium vessel disposed within the vacuum vessel;a thermal shield disposed between the vacuum vessel and the helium vessel; anda set of passive compensation coils disposed within the vacuum vessel.2. A magnet apparatus according to claim 1 , wherein the set of passive compensation coils comprises:a first set of passive compensation coils for a z-axis direction;a second set of passive compensation coils for a y-axis direction; anda third set of passive compensation coils for an x-axis direction.3. A magnet apparatus according to claim 1 , wherein the passive compensation coils are superconducting coils.4. A magnet apparatus according to claim 3 , wherein the passive compensation coils are constructed from a low temperature superconducting material.5. A magnet apparatus according to claim 3 , wherein the passive compensation coils are constructed from a high temperature superconducting material.6. A magnet apparatus according to claim 1 , wherein the helium vessel comprises an outer cylinder and an inner cylinder claim 1 , the outer cylinder having an outer surface and the set of passive compensation coils disposed on the outer surface of the outer cylinder of the helium vessel.7. A magnet apparatus according to claim 1 , wherein the helium vessel comprises an outer cylinder and an inner cylinder claim 1 , the inner cylinder having an outer surface and the set of passive compensation coils disposed on the outer surface ...

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Номер записи: 95
20-06-2013 дата публикации

SYSTEM FOR MAGNETIC FIELD DISTORTION COMPENSATION AND METHOD OF MAKING SAME

Номер: US20130157865A1
Автор: Gronemeyer Benjamin Jacob, HAVENS TIMOTHY JOHN, Jiang Longzhi, Mogatadakala Venkata Kishore, SAHA SAIKAT, Shen Weijun
Принадлежит: GENERAL ELECTRIC COMPANY

A system and method for magnetic field distortion compensation includes a cryostat for a magnetic resonance imaging (MRI) system. The cryostat includes a vacuum casing having a vacuum therein. A cryogen vessel is disposed within the casing, the vessel having a coolant therein. A thermal shield is disposed between the vacuum casing and the cryogen vessel. An eddy current compensation assembly is disposed within the casing. The eddy current compensation assembly includes a plurality of electrically conductive loops formed on one of the vacuum casing, the cryogen vessel, and the thermal shield and constructed to mitigate vibration-induced eddy currents in the MRI system. 1. A cryostat for a magnetic resonance imaging (MRI) system , the cryostat comprising:a vacuum casing having a vacuum therein;a cryogen vessel disposed within the casing, the vessel having a coolant therein;a thermal shield disposed between the vacuum casing and the cryogen vessel; andan eddy current compensation assembly disposed within the casing, the eddy current compensation assembly comprising a plurality of electrically conductive loops formed on one of the vacuum casing, the cryogen vessel, and the thermal shield and constructed to mitigate vibration-induced eddy currents in the MRI system.2. The cryostat of wherein the coolant comprises helium.3. The cryostat of wherein the plurality of electrically conductive loops comprises a non-superconducting material.4. The cryostat of wherein the eddy current compensation assembly further comprises one of aluminum claim 3 , copper claim 3 , and silver.5. The cryostat of wherein the eddy current compensation assembly further comprises copper tape.6. The cryostat of wherein at least one surface of the one of the vacuum casing claim 1 , the cryogen vessel claim 1 , and the thermal shield has a first portion having the plurality of electrically conductive loops formed therein and a second portion free of the plurality of electrically conductive loops; ...

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Номер записи: 96
27-06-2013 дата публикации

SYSTEM AND METHOD TO REDUCE POWER LOSS IN A GRADIENT AMPLIFIER

Номер: US20130162250A1
Автор: Chi Song, Lai Rixin, Sabate Juan Antonio, Shi Yimeng, Skeffington Wesley Michael, Zhang Yanjun
Принадлежит: GENERAL ELECTRIC COMPANY

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 ...

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Номер записи: 97
27-06-2013 дата публикации

MR HF COILS HAVING FLEXIBILITY THAT CAN BE MODULATED

Номер: US20130162252A1
Автор: Heid Oliver
Принадлежит:

The invention relates to a local coil arrangement () for an imaging system (), wherein the local coil arrangement () is rigid in a first state, wherein the local coil arrangement () is flexible is a second state, wherein the local coil arrangement () comprises a reinforcing arrangement (W; S) by which (W; S) the local coil arrangement () can be brought from the flexible state into the rigid state, and by which (W; S) the local coil arrangement () can be brought from the rigid state to the flexible state. 1. A local coil arrangement for an imaging system , wherein the local coil arrangement is rigid in a first state , and wherein the local coil arrangement is flexible in a second state , the local coil arrangement comprising:a reinforcing arrangement, by which the local coil arrangement is transformable from the flexible state into the rigid state, and by which the local coil arrangement is transformable from the rigid state into the flexible state.2. The local coil arrangement as claimed in claim 1 , further comprising elements that are flexible relative to one another claim 1 ,wherein the elements are reinforceable relative to one another.3. The local coil arrangement as claimed in claim 1 , further comprising a plurality of coil elements.4. The local coil arrangement as claimed in claim 1 , further comprising a plurality of coil elements that are arranged in a network configuration.5. The local coil arrangement as claimed in claim 1 , further comprising a plurality of coil elements that rub against one another during a movement relative to one another.6. The local coil arrangement as claimed in claim 1 , further comprising a plurality of coil elements claim 1 , a surface of the plurality of coil elements being toothed.7. The local coil arrangement as claimed in claim 1 , further comprising a plurality of coil elements claim 1 , a contact pressure of the plurality of coil elements being adjustable.8. The local coil arrangement as claimed in claim 1 , wherein a ...

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Номер записи: 98
27-06-2013 дата публикации

SELECTION UNIT FOR A MAGNETIC RESONANCE IMAGING SYSTEM

Номер: US20130162253A1
Автор: Biber Stephan, Bollenbeck Jan, Oppelt Ralph, Rauh Georg, Schnell Wilfried, Vester Markus
Принадлежит:

A selection unit for a magnetic resonance imaging system may be provided. The selection unit electrically connects a first number of electrical terminals to a second number of communication entities. The selection unit is arranged in and/or on a mobile object-support element for moving an examination object which is to be depicted by the magnetic resonance imaging system into a recording position. 1. A device comprising:a selection unit for a magnetic resonance imaging system and configured to electrically connect a first number of electrical terminals to a second number of communication entities,wherein the selection unit is arranged in and/or on a mobile object-support element for moving an examination object into a recording position.2. The device as claimed in claim 1 , wherein the first number is different from the second number.3. The device as claimed in claim 2 , wherein the first number is greater than the second number.4. The device as claimed in claim 1 , wherein the electrical terminals comprise an antenna element for a magnetic resonance signal.5. The device as claimed in claim 1 , wherein the electrical terminals comprise a tuning element for tuning an antenna element for a magnetic resonance signal.6. The device as claimed in claim 3 , wherein the electrical terminals comprise a tuning element for tuning the antenna element for the magnetic resonance signal.7. The device as claimed in claim 1 , wherein the communication entities comprise receivers for a magnetic resonance signal.8. The device as claimed in claim 5 , wherein the communication entities comprise receivers for the magnetic resonance signal.9. The device as claimed in claim 1 , wherein the communication entities comprise a trigger device for a tuning element configured to tune an antenna element for a magnetic resonance signal.10. The device as claimed in claim 4 , wherein the communication entities comprise a trigger device for the tuning element.11. The device as claimed in claim 5 , ...

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Номер записи: 99
27-06-2013 дата публикации

Systems and methods for automatic landmarking

Номер: US20130165767A1
Автор: Eric William Fiveland, Ileana Hancu, Robert David Darrow, William Thomas Dixon
Принадлежит: General Electric Co

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.

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Номер записи: 100