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公开(公告)号：US11122988B2
公开(公告)日：2021-09-21
申请号：US15107540
申请日：2015-08-06
申请人： HITACHI, LTD.
发明人： Yo Taniguchi , Suguru Yokosawa , Hisaaki Ochi , Toru Shirai , Shinji Kurokawa
IPC分类号： A61B5/055 , G01R33/56 , G01R33/387 , G01R33/565 , G01R33/24 , G01R33/483 , G01R33/561 , G01R33/50
摘要： A technology of improving image quality of a calculation image or parameter estimation accuracy even in a case where a method of simultaneously generating calculation images of a plurality of parameters is used is provided. Thus, by utilization of a reconstructed image in an optimal resolution of each parameter to be estimated, a value of the parameter is estimated and a calculation image that is a distribution of the value of the parameter is acquired. A reconstructed image in an optimal resolution is acquired by adjustment of a resolution of a reconstructed image acquired in an optimal resolution of an estimation parameter with the highest optimal resolution among parameters to be estimated in scanning. Alternatively, in scanning, only a reconstructed image used for calculation of a predetermined parameter to be estimated is acquired in an optimal resolution of the parameter to be estimated.
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公开(公告)号：US10976391B2
公开(公告)日：2021-04-13
申请号：US16693832
申请日：2019-11-25
申请人： Bruker BioSpin GmbH
发明人： Rainer Pietig , Volker Niemann , Lukas Haenichen
IPC分类号： G01R33/383 , H01F7/02 , G01R33/387
摘要： A magnet arrangement having a hollow-cylindrical magnet element that has an axial length Lz,M and an inner radius Rin, is constructed from magnet segments arranged concentrically around the z-axis, and has a Halbach magnetization. At least one ring-shaped magnet element has a notched, hollow-cylindrical cutout extending circumferentially around the z-axis symmetrically with respect to the plane z=0, the axial extent Lz,A of the cutout being less than the axial length Lz,M of the magnet element. The cutout has a radial depth TA and an axial length Lz,A
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公开(公告)号：US20200271741A1
公开(公告)日：2020-08-27
申请号：US16797384
申请日：2020-02-21
发明人： Dominik Paul , Flavio Carinci , Wilhelm Horger , Mario Zeller
IPC分类号： G01R33/483 , G01R33/561 , G01R33/387 , G01R33/30 , A61B5/055 , A61B5/00
摘要： Techniques are disclosed for acquiring magnetic resonance data of an object with a magnetic resonance imaging apparatus. A slice group is imaged whose slices define a contiguous imaging volume and which contains a first number of slices. In a number of concatenations, the magnetic resonance data for subgroups of the slices, each containing a respective second number of slices depending on the first number of concatenations, are acquired, and shimming is performed to increase field homogeneity in the imaging volume. To define the subgroups, the imaging volume is subdivided into at least two disjoint contiguous sub-volumes, and at least two subgroups are defined for each sub-volume, each subgroup only containing non-adjacent slices in the sub-volume. During acquisition of the magnetic resonance data of each subgroup, shimming is at least restricted to the respective sub-volume.
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公开(公告)号：US10429464B2
公开(公告)日：2019-10-01
申请号：US15902520
申请日：2018-02-22
发明人： Daniel Niederloehner , Dominik Paul
IPC分类号： G01R33/38 , 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.
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公开(公告)号：US10267885B2
公开(公告)日：2019-04-23
申请号：US14882793
申请日：2015-10-14
发明人： David Grodzki
IPC分类号： G01R33/565 , G01R33/00 , G01R33/025 , G01R33/387 , G01R33/389
摘要： To enable improved magnetic resonance imaging in the vicinity of an interference object that produces a magnetic interference field in an examination region, in a method and apparatus for magnetic resonance imaging of the examination region magnetic resonance raw data are acquired from the examination region by execution of a magnetic resonance sequence having multiple repetition intervals and refocusing of spins in the examination region at the end of each repetition interval repetition intervals. During at least part of the duration of the acquisition of the magnetic resonance raw data, a magnetic compensation gradient is activated that is opposed to the magnetic interference field.
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公开(公告)号：US20190041477A1
公开(公告)日：2019-02-07
申请号：US16074497
申请日：2017-02-05
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.
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公开(公告)号：US10107883B2
公开(公告)日：2018-10-23
申请号：US14671528
申请日：2015-03-27
申请人： Michael Hutchinson
发明人： Michael Hutchinson
IPC分类号： G01R33/561 , G01R33/565 , G01R33/50 , G01R33/387 , G01R33/32 , G01R33/3415 , A61B5/055 , G01R33/483
摘要： Magnetic Resonance Imaging (MRI), which is given the acronym ULTRA (Unlimited Trains of Radio Acquisitions), can eliminate magnetic gradient reversals and allow simultaneous MR signal acquisition from the entire object volume in each of a multitude of very small receiver coils arranged in a 3D array around the imaging volume. This permits a rate of MR signal acquisition that is greatly increased (e.g. 256 times) compared with existing techniques, with a full 3D image constructed in as little as 1 millisecond. Furthermore, noise—both audible and electrical—is substantially reduced. The advantages over conventional MRI include: 1. Clinical imaging can be completed in seconds, with good signal-to-noise ratio; 2. Signal-to-noise ratio is further increased by eliminating RF noise due to gradient switching; 3. Real-time functional MRI is possible, on millisecond timescales; 4. With single breath holds, high quality imaging of thorax and abdomen is possible. 5. ULTRA greatly reduces audible noise and vibration.
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8.发明申请公开(公告)号：US20180238979A1
公开(公告)日：2018-08-23
申请号：US15902520
申请日：2018-02-22
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.
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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).
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公开(公告)号：US09995804B2
公开(公告)日：2018-06-12
申请号：US14396974
申请日：2013-04-09
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.
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