公开(公告)号：US20190041477A1

公开(公告)日：2019-02-07

申请号：US16074497

申请日：2017-02-05

申请人： Clear-Cut Medical Ltd.

发明人： Moshe SHAPIRO

IPC分类号： G01R33/383 ,  G01R33/30 ,  G01R33/387

CPC分类号： G01R33/383 ,  G01N24/08 ,  G01R33/307 ,  G01R33/387 ,  G01R33/48

摘要： A tissue imaging system (10) includes a stationary array of magnets (12) arranged to generate an inhomogeneous main magnetic field (BO), a tissue holder (16) adjacent the array of magnets (12) and operative to move tissue (14) placed therein about and/or along a coordinate axis, one or more RF receive coils (20) adjacent the tissue holder (16) and the magnets (12), and an MRI processor in communication with the magnets (12), the RF receive coils (20) and the tissue holder (16). An image of the tissue (14) is created by using spatial encoding of magnetic resonance signals generated by the magnets (12) and RF receive coils (20) for different spatial orientations of the tissue (14) moved by the tissue holder (16) with respect to the magnets. Spatial inhomogeneities in the main magnetic field spatially modulate a phase of each of the magnetic resonance signals.

公开(公告)号：US20180238979A1

公开(公告)日：2018-08-23

申请号：US15902520

申请日：2018-02-22

申请人： Siemens Healthcare GmbH

发明人： Daniel Niederloehner ,  Dominik Paul

IPC分类号： G01R33/387 ,  A61B5/055

CPC分类号： G01R33/387 ,  A61B5/055 ,  G01R33/3875

摘要： In a magnetic resonance apparatus having a scanner that generates a basic magnetic field in an imaging volume, and an operating method to acquire data from an entirety of a recording volume, wherein the scanner has a global shim coil acting on the entire imaging volume, and a local shim coil acting, with the global shim coil, on a sub-volume containing a region of interest, a first adjustment volume is established that contains the recording volume. A smaller, second adjustment volume is established containing the region of interest, and at most, the sub-volume. Using a field map of the basic magnetic field that covers the first adjustment volume, shim currents are respectively identified for the global shim unit, for homogenizing the first adjustment volume, and for the local shim unit, for homogenizing the second adjustment volume, accounting for the effect of the first shim currents on the second adjustment volume.

公开(公告)号：US09995805B2

公开(公告)日：2018-06-12

申请号：US14379587

申请日：2013-02-20

申请人： Hitachi, Ltd.

发明人： Ryuya Ando

IPC分类号： G01V3/00 ,  G01R33/387 ,  G01R33/3873 ,  G01R33/381 ,  G01R33/56 ,  G01R33/565 ,  G01R33/38 ,  G01R33/3815

CPC分类号： G01R33/387 ,  G01R33/3806 ,  G01R33/381 ,  G01R33/3815 ,  G01R33/3873 ,  G01R33/5608 ,  G01R33/565

摘要： A computer executes: calculating a first volume distribution (v.d.) of magnetic materials on a shim tray, based on a first magnetic field strength distribution (m.f.s.d.) in a magnetic field space (S3); acquiring a first composite distribution (c.d.) representing a volume by addition of volumes of magnetic materials for each region of the shim tray, and positions of the regions (S5); calculating a virtual m.f.s.d. created by magnetic materials supposed to be arranged as in the first c.d. (S8); calculating a second m.f.s.d. by addition of the first m.f.s.d. and the virtual m.f.s.d. (S9); calculating a second v.d. of magnetic materials on the shim tray, based on the second m.f.s.d. (S3); acquiring a second c.d. representing a volume by addition of volumes of magnetic materials for each region, and positions of the regions (S5); and displaying the positions of regions and the volumes in the first c.d. and second c.d. (S10).

公开(公告)号：US09995804B2

公开(公告)日：2018-06-12

申请号：US14396974

申请日：2013-04-09

申请人： KONINKLIJKE PHILIPS N.V.

发明人： James Howard Kralick ,  Frank Battista ,  Jeffrey Edward Leach ,  Dennis Ambrose Becker

IPC分类号： G01R33/30 ,  G01R33/385 ,  G01R33/387 ,  G01R33/24

CPC分类号： G01R33/3858 ,  G01R33/24 ,  G01R33/243 ,  G01R33/307 ,  G01R33/387

摘要： A magnetic resonance imaging (MRI) system includes an MRI magnet (100) including a bore (101) and having a magnetic field and a gradient coil (400) disposed within the bore and having an isocenter (404). A first location within the MRI magnet is determined with respect to a first predetermined reference surface of the MRI magnet, the first location representing a center (104) of the magnetic field. A second location within the gradient coil is determined with respect to a second predetermined reference surface of the gradient coil, the second location representing the isocenter. When the gradient coil is installed within the bore, the second predetermined reference surface abuts the first predetermined reference surface. The first predetermined reference surface is adjusted to an adjusted position, the adjusted position being determined as a function of the first location and the second location and corresponding to a position of the first predetermined reference surface at which the first location coincides with the second location when the gradient coil is installed within the bore.

公开(公告)号：US09857443B2

公开(公告)日：2018-01-02

申请号：US14212662

申请日：2014-03-14

申请人： University Health Network

发明人： Tony Tadic ,  Teodor Marius Stanescu

IPC分类号： G01V3/00 ,  G01R33/387 ,  G01R33/565 ,  G01R33/58 ,  G01R33/48

CPC分类号： G01R33/387 ,  G01R33/4808 ,  G01R33/56572 ,  G01R33/58

摘要： Various embodiments are described herein for an apparatus and a method for measuring and characterizing geometric distortions for a region of interest in images obtained using magnetic resonance. The method comprises deriving a computed set of 3D distortion vectors for a set of points within a region of interest covered by a phantom by using harmonic analysis to solve an associated boundary value problem based on boundary conditions derived from a measured set of 3D distortion vectors. The characterized image distortions may be used for various purposes such as for image correction or for shimming, for example.

公开(公告)号：US20170343631A1

公开(公告)日：2017-11-30

申请号：US15605253

申请日：2017-05-25

申请人： KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY

发明人： Hyun Wook PARK ,  Dong Chan KIM

IPC分类号： G01R33/385 ,  G01R33/387 ,  G01R33/48 ,  G01R33/483

CPC分类号： G01R33/3852 ,  G01R33/387 ,  G01R33/482 ,  G01R33/4824 ,  G01R33/4835 ,  G01R33/5611

摘要： The present disclosure in some embodiments provides a method and an apparatus for processing MRI images wherein a plurality of slices of an object is applied with a spatial encoding gradient and a corrected gradient for applying a radial sampling, and radially sampled magnetic resonance signals of the slices are received, and MRI images are generated with the radial sampling applied over multi-bands.

公开(公告)号：US20160041249A1

公开(公告)日：2016-02-11

申请号：US14823372

申请日：2015-08-11

申请人： Siemens Aktiengesellschaft

发明人： Kuan Jin Lee ,  Dominik Paul ,  Mario Zeller

IPC分类号： G01R33/565

CPC分类号： G01R33/5611 ,  G01R33/246 ,  G01R33/28 ,  G01R33/387 ,  G01R33/389 ,  G01R33/4816 ,  G01R33/4818 ,  G01R33/4828 ,  G01R33/483 ,  G01R33/4833 ,  G01R33/4835 ,  G01R33/4838 ,  G01R33/5607

摘要： In a method and apparatus for generating a magnetic resonance (MR) image MR data are acquired from a subject as datasets in parallel with multiple RF coils, with first parallel dataset being acquired with a first parameter set and at least one further parallel dataset being acquired with a second parameter set. A first intermediate image dataset and at least one further intermediate image dataset are reconstructed with at least one of (a) the first intermediate image dataset being reconstructed from said first parallel dataset using a calibration data item derived from said at least one further parameter set, and (b) said at least one further intermediate image dataset is reconstructed from said at least one further parallel dataset using a calibration data item derived from said first parameter set. A combination image dataset is generated by combining said first intermediate image dataset and said at least one further intermediate dataset.

摘要翻译： 在用于生成磁共振（MR）图像的方法和装置中，MR数据作为与多个RF线圈并联的数据集从主体获取，其中第一并行数据集被获取具有第一参数集并且至少一个进一步的并行数据集被获取 具有第二个参数集。 重建第一中间图像数据集和至少一个另外的中间图像数据集，其中（a）使用从所述至少一个另外的参数集导出的校准数据项从所述第一并行数据集重构第一中间图像数据集中的至少一个， 和（b）使用从所述第一参数集导出的校准数据项，从所述至少一个另外的并行数据集重建所述至少一个另外的中间图像数据集。 通过组合所述第一中间图像数据集和所述至少一个其它中间数据集来生成组合图像数据集。

公开(公告)号：US09244140B1

公开(公告)日：2016-01-26

申请号：US14450751

申请日：2014-08-04

申请人： FONAR Corporation

发明人： Raymond V. Damadian ,  Gordon T. Danby ,  Hank Hsieh ,  John W. Jackson ,  Mark Gelbien ,  William H. Wahl ,  Charles A. Green

IPC分类号： G01V3/00 ,  G01R33/3875 ,  G01R33/38 ,  G01R33/3815 ,  G01R35/00 ,  G01R33/30

CPC分类号： G01R33/3804 ,  G01R33/307 ,  G01R33/3802 ,  G01R33/3806 ,  G01R33/3815 ,  G01R33/387 ,  G01R33/3873 ,  G01R33/3875 ,  G01R33/421 ,  G01R33/58 ,  G01R35/005 ,  H01F6/04 ,  H01F6/06

摘要： A magnetic resonance imaging configuration, apparatus and method to straighten and otherwise homogenize the field lines in the imaging portion, creating improved image quality. Through use of calibrated corrective coils, magnetic field lines can be manipulated to improve uniformity and image quality. Additionally, when the apparatus is composed of non-ferromagnetic materials, field strengths can be increased to overcome limitations of Iron-based systems such as by use of superconductivity. A patient positioning apparatus allows multi-positioning of a patient within the calibrated and more uniform magnetic field lines.

摘要翻译： 用于使成像部分中的场线拉直或以其它方式均匀化的磁共振成像配置，装置和方法，产生改善的图像质量。 通过使用校准的校正线圈，可以操纵磁场线以提高均匀性和图像质量。 此外，当设备由非铁磁材料组成时，可以增加场强以克服铁基系统的限制，例如通过使用超导性。 患者定位装置允许患者在校准的和更均匀的磁场线中的多位置定位。

公开(公告)号：US09213073B2

公开(公告)日：2015-12-15

申请号：US14185273

申请日：2014-02-20

申请人： Nicholas Paul Aley

发明人： Nicholas Paul Aley

IPC分类号： G01R33/387 ,  G01R33/389 ,  G01R33/3815 ,  H01F6/06

CPC分类号： G01R33/387 ,  G01R33/3815 ,  G01R33/389 ,  H01F6/06

摘要： An MRI system has a cylindrical superconducting magnet assembly contained in a bore tube of a cylindrical vacuum vessel (OVC), and a gradient coil assembly situated within the OVC bore tube. In an imaging region within a bore of the gradient coil assembly, the magnet assembly produces a magnetic field that is subject to drift during operation of the MRI system. Compensating material is located at a radial position between the imaging region and the magnet in a location that will be heated over a range of temperatures during operation of the MRI system. The compensating material is adjustable between two magnetic phases in response to an applied physical characteristic, which is selectively applied thereto so as to change the compensating material from a first magnetization to a second magnetization, and thereby compensate the drift.

摘要翻译： MRI系统具有包含在圆柱形真空容器（OVC）的孔管中的圆柱形超导磁体组件和位于OVC孔管内的梯度线圈组件。 在梯度线圈组件的孔内的成像区域中，磁体组件产生在MRI系统操作期间经受漂移的磁场。 在MRI系统的操作期间，补偿材料位于成像区域和磁体之间的径向位置，该位置将在温度范围内被加热。 响应于施加的物理特性，补偿材料在两个磁相之间是可调节的，其被选择性地施加到其上，以便将补偿材料从第一磁化改变为第二磁化，从而补偿漂移。

公开(公告)号：US20150212171A1

公开(公告)日：2015-07-30

申请号：US14607240

申请日：2015-01-28

申请人： Wittelsbacherplatz 2

发明人： Franz Hebrank ,  Wilhelm Horger ,  Michael Koehler

IPC分类号： G01R33/36 ,  G01R33/44 ,  G01R33/387

CPC分类号： G01R33/3635 ,  G01R33/36 ,  G01R33/3607 ,  G01R33/387 ,  G01R33/44 ,  G01R33/5616 ,  G01R33/56341 ,  G01R33/5659

摘要： In a method and apparatus for acquiring a magnetic resonance image data set of a scan area of an examination subject, the image data are acquired with a magnetic resonance apparatus having a transmitter coil that emits a radio-frequency signal having at least two transmission channels so that different polarizations of the radio-frequency signal are produced, and a magnetic resonance sequence is used to acquire raw data for the magnetic resonance image data set, wherein raw data are acquired during at least two scanning operations with the magnetic resonance sequence, with different polarizations of the radio-frequency signals being used for at least two of the at least two scanning operations, following which the magnetic resonance image data set is determined by averaging the raw data.

摘要翻译： 在用于获取检查对象的扫描区域的磁共振图像数据组的方法和装置中，利用具有发射具有至少两个传输通道的射频信号的发射器线圈的磁共振装置获取图像数据， 产生射频信号的不同极化，并且使用磁共振序列来获取用于磁共振图像数据集的原始数据，其中在具有磁共振序列的至少两次扫描操作期间获取原始数据，具有不同的 所述射频信号的极化被用于所述至少两个扫描操作中的至少两个，随后通过对原始数据进行平均来确定磁共振图像数据集。