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1.发明公开公开(公告)号：US20240248160A1
公开(公告)日：2024-07-25
申请号：US18419332
申请日：2024-01-22
发明人： Stephan Biber , Stefan Stocker , Andrew Dewdney , Jürgen Nistler , Ludwig Eberler , Simon Körber
IPC分类号： G01R33/422 , G01R33/385 , G01R33/3873
CPC分类号： G01R33/422 , G01R33/385 , G01R33/3873
摘要： The disclosure relates to a detector unit comprising a radio frequency antenna unit and a gradient coil unit surrounding the radio frequency antenna unit concentrically, each embodied as hollow cylinders surrounding a cylinder axis in the longitudinal direction. The detector unit comprises at least four shim units, which are embodied as oblong shapes and are each arranged in parallel to the cylinder axis at various positions in the circumferential direction on a first inner surface, with said first inner surface corresponding to the side of the gradient coil unit facing towards the cylinder axis, and forming raised areas in the direction of the cylinder axis . The detector unit comprises a fixing unit embodied for fixing the at least four shim units to the gradient coil unit, and an RF screen, which is arranged at least partly between the radio frequency antenna unit and the gradient coil unit.
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公开(公告)号：US11988730B2
公开(公告)日：2024-05-21
申请号：US17707375
申请日：2022-03-29
申请人： Aspect Imaging Ltd.
发明人： Uri Rapoport , Yair Goldfarb , Yoram Cohen
IPC分类号： H01F7/02 , G01R33/383 , G01R33/3873 , G01R33/421 , G01R33/565
CPC分类号： G01R33/383 , G01R33/3873 , G01R33/421 , G01R33/56563 , H01F7/0273 , H01F7/0278
摘要： A magnetic field device, with a first magnet, a first ferromagnetic element positioned adjacent to the first magnet, a second magnet, a second ferromagnetic element positioned adjacent to the second magnet and relative to the first ferromagnetic element to create a gap between the first ferromagnetic element and the second ferromagnetic element, and a third magnet positioned between the first ferromagnetic element and the second ferromagnetic element and within the gap.
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公开(公告)号：US11740302B2
公开(公告)日：2023-08-29
申请号：US17696454
申请日：2022-03-16
IPC分类号： G01R33/383 , G01R33/24 , G01R33/38 , G01R33/381 , G01R33/3873 , G01R33/44 , H01F7/02 , H01F7/06 , H01F13/00
CPC分类号： G01R33/383 , G01R33/243 , G01R33/381 , G01R33/3806 , G01R33/3873 , G01R33/445 , H01F7/0278 , H01F7/064 , H01F13/003 , G01R33/3802
摘要： A method of producing a permanent magnet shim configured to improve a profile of a B0 magnetic field produced by a B0 magnet is provided. The method comprises determining deviation of the B0 magnetic field from a desired B0 magnetic field, determining a magnetic pattern that, when applied to magnetic material, produces a corrective magnetic field that corrects for at least some of the determined deviation, and applying the magnetic pattern to the magnetic material to produce the permanent magnet shim. According to some aspects, a permanent magnet shim for improving a profile of a B0 magnetic field produced by a B0 magnet is provided. The permanent magnet shim comprises magnetic material having a predetermined magnetic pattern applied thereto that produces a corrective magnetic field to improve the profile of the B0 magnetic field.
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公开(公告)号：US11733329B2
公开(公告)日：2023-08-22
申请号：US17390985
申请日：2021-08-01
申请人： ETH Zurich , UNIVERSITAET ZUERICH
发明人： David Brunner , Simon Gross , Klaas Pruessmann
IPC分类号： G01R33/3873 , G01R33/38 , G01R33/54
CPC分类号： G01R33/3873 , G01R33/3804 , G01R33/543
摘要： A magnetic resonance (MR) apparatus comprises magnet means for generating a main magnetic field in a sample region, encoding means for generating encoding magnetic fields superimposed to the main magnetic field, RF transmitter means for generating MR radiofrequency fields, driver means for operating said encoding means and RF transmitter means to generate superimposed time dependent encoding fields and radiofrequency fields according to an MR sequence for forming images or spectra; and acquisition means for acquiring an MR signal from said object. The magnet means comprise a primary magnetic field source providing a static magnetic field B0 and at least one secondary magnetic field source providing an adjustable magnetic field B′. To provide improved shimming, the secondary magnetic field source comprises at least two spatially distinct portions of a first magnetic material and of a second magnetic material, respectively, said first magnetic material having a first magnetic moment density m1 and said second magnetic material having a second magnetic moment density m2, and means for independently adjusting said second magnetic moment density m2 by variation of an external control parameter.
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公开(公告)号：US20230095957A1
公开(公告)日：2023-03-30
申请号：US17884078
申请日：2022-08-09
IPC分类号： G01R33/383 , A61B5/055 , G01R33/34 , G01R33/385 , G01R33/3873 , G01R33/44
摘要： An apparatus for providing a B0 magnetic field for a magnetic resonance imaging system. The apparatus includes at least one permanent B0 magnet to contribute a magnetic field to the Bo magnetic field for the MRI system and a ferromagnetic frame configured to capture and direct at least some of the magnetic field generated by the B0 magnet. The ferromagnetic frame includes a first post having a first end and a second end, a first multi-pronged member coupled to the first end, and a second multi-pronged member coupled to the second end, wherein the first and second multi-pronged members support the at least one permanent B0 magnet.
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公开(公告)号：US20220373622A1
公开(公告)日：2022-11-24
申请号：US17748198
申请日：2022-05-19
发明人： Markus MAYER , Franco SESTITO
IPC分类号： G01R33/34 , G01R33/3873
摘要： A fastening device for releasably fastening a probe (1) to an NMR magnet (2). An insert part (3) fastens the probe to a retaining system (4) connected to the magnet. A force-variable connection is established by the insert part with spring elements (8). The probe fastens to the insert part with rigid retaining elements (6). When closed, a connection without mechanical play exists between the insert part and the retaining elements when the spring elements are under tension. An annular disc-shaped pretensioning element (9) is arranged between the insert part and the retaining system. By rotating the pretensioning element relative to the insert part, the pretensioning element presses on and pretensions the spring elements. When open, the spring elements and the retaining elements are configured to connect with a mechanical play of 0.5 to 5 mm between the insert part and the retaining elements when the spring elements are pretensioned.
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公开(公告)号：US20220308140A1
公开(公告)日：2022-09-29
申请号：US17705671
申请日：2022-03-28
发明人： Stephan Biber
IPC分类号： G01R33/3875 , G01R33/3873
摘要： A magnetic resonance apparatus may include at least one sensor and a controller. The magnetic resonance apparatus is positionable in an examination room. A spatial location of the magnetic resonance apparatus in the examination room can be determined using the sensor. In a method for supporting an adjustment of a shim parameter of a magnetic resonance apparatus, a current spatial location of the magnetic resonance apparatus in an examination room is determined using the sensor, and a shim parameter of at least one shim element of the magnetic resonance apparatus is determined based on the current spatial location of the magnetic resonance apparatus and information of a magnetic field database. The magnetic field database may include information about a spatial location of the magnetic resonance apparatus and also magnetic field data correlated with the spatial location.
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公开(公告)号：US20220291312A1
公开(公告)日：2022-09-15
申请号：US17707375
申请日：2022-03-29
申请人： Aspect Imaging Ltd.
发明人： Uri RAPOPORT , Yair GOLDFARB , Yoram COHEN
IPC分类号： G01R33/383 , H01F7/02 , G01R33/421 , G01R33/3873 , G01R33/565
摘要： A magnetic field device, with a first magnet, a first ferromagnetic element positioned adjacent to the first magnet, a second magnet, a second ferromagnetic element positioned adjacent to the second magnet and relative to the first ferromagnetic element to create a gap between the first ferromagnetic element and the second ferromagnetic element, and a third magnet positioned between the first ferromagnetic element and the second ferromagnetic element and within the gap.
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公开(公告)号：US20220171007A1
公开(公告)日：2022-06-02
申请号：US17600616
申请日：2020-04-01
发明人： Peter Forthmann
IPC分类号： G01R33/3873
摘要： A shim tray (10) for a main magnet system of a magnetic resonance examination system comprises a plurality of shim pockets (11), of which an individual shim pocket has side walls (21, 42) forming an open channel (11). Two opposite lateral side walls (21) have insertion profiles (22) to receive an end shim-element (13) at least one open channel's end. Essentially the entire volume of the channel of the shim pocket is available to hold passive shim elements.
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公开(公告)号：US11273454B2
公开(公告)日：2022-03-15
申请号：US15741472
申请日：2016-07-04
发明人： Devrim Kilinc , Peng Li , Gil Lee , Dhruv Ghandi , Stefano Rampini
IPC分类号： G01R33/3873 , B03C1/24 , B03C1/28 , G01N27/74 , G01N33/543
摘要： There is provided system and a separation substrate device for use with an NLM separator in separating and/or detecting at least one target analyte in a sample, the substrate comprising a micromagnet array of a plurality of micromagnets, the micromagnet array comprising a first capture region, a second focusing region, and, a third detection region, the focusing region comprising a converging and/or diverging micromagnet array region. Also provided is a method for separating and detecting at least one target analyte in a sample. The method including: contacting a plurality of magnetic beads with a sample, the magnetic beads functionalized for binding with one or more target analytes in a sample to form aggregates; providing the sample including magnetic beads and aggregates to a separating substrate comprising a micromagnet array of a plurality of micromagnets; transporting the magnetic beads and aggregates relative to the micromagnet array to provide separation and enable detection of the magnetic beads and aggregates; detecting motion of the beads or aggregates of the sample on the array in response to the applied magnetic field and/or detecting beads or aggregates of the sample on the array at a detection region of the array.
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