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公开(公告)号：US11237235B2
公开(公告)日：2022-02-01
申请号：US16773532
申请日：2020-01-27
发明人： Chad Tyler Harris , Philip J. Beatty , Alexander Gyles Panther , Jeff Alan Stainsby , David Mark Deschenes
IPC分类号： G01V3/00 , G01R33/3875 , G01R33/385 , G01R33/54
摘要： A method for operating a magnetic resonance imaging (MRI) system that includes: accessing data indicating a first region for imaging a portion of a subject, the portion being placed in a main magnet of the MRI system and the main magnet generating a magnetic field; selecting, from a group of available shimming coils, a first subset of shimming coils arranged and configured such that, when the shimming coils in the first subset are driven, a homogeneity of the magnetic field at the first region is increased; and driving the shimming coils in the selected first subset of shimming coils without driving other shimming coils in the group of available shimming coils such that the homogeneity of the magnetic field at the first region increases relative to the homogeneity of the magnetic field at the first region when the shimming coils of the selected first subset are not driven.
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2.发明申请公开(公告)号：US20210263121A1
公开(公告)日：2021-08-26
申请号：US17301312
申请日：2021-03-31
发明人： Chad Tyler Harris , David Mark Deschenes , Alexander Gyles Panther , Jeff Alan Stainsby , Philip J. Beatty
IPC分类号： G01R33/50 , G01R33/38 , G01R33/3815 , G01R33/44
摘要： Systems and methods for magnetic field-dependent relaxometry using magnetic resonance imaging (“MRI”) are provided. Relaxation parameters, including longitudinal relaxation time (“T1”) and transverse relaxation time (“T2”), are estimated from magnetic resonance signal data acquired at multiple different magnetic field strengths using the same MRI system. By measuring these relaxation parameters as a function of magnetic field strength, T1 dispersion data, T2 dispersion data, or both, are generated. Based on this dispersion data, quantitative physiological parameters can be estimated. As one example, iron content can be estimated from T2 dispersion data.
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公开(公告)号：US20220349968A1
公开(公告)日：2022-11-03
申请号：US17810525
申请日：2022-07-01
IPC分类号： G01R33/3815 , G01R33/38 , H01F6/04
摘要： A magnetic resonance imaging (MRI) system includes a set of magnet coils for generating a magnetic field. The set of magnet coils are composed of a superconducting material. The system further includes a mechanical cryocooler in thermal contact with the set of magnet coils and operable to reduce and maintain a temperature of the set of magnet coils below a transition temperature of the superconducting material, and an energy storage device coupled to the set of magnet coils. The energy storage device may be capable of receiving and storing energy dissipated from the set of magnet coils during rapid shutdown of the set of magnet coils. The system may also include a controller coupled to the energy storage device. The controller may be programmed to recharge the set of magnet coils using the energy stored in the energy storage device during the rapid shutdown of the set of magnet coils.
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公开(公告)号：US11085978B2
公开(公告)日：2021-08-10
申请号：US16435324
申请日：2019-06-07
发明人： Ian Robert Oliphant Connell , Gilbert Thevathasan , William Wai-Leung Lau , Alexander Gyles Panther
IPC分类号： G01R33/34 , A61B5/055 , G01R33/341
摘要： A head coil assembly includes a housing with a lower portion, an upper portion, a left portion, and a right portion, wherein each portion includes two or more radio-frequency (RF) coils, wherein the portions are sized and shaped to adjustably conform to a curvature of the subject's head for magnetic resonance (MR) imaging of the subject's head placed inside the housing, wherein the portions are operable to transition from an open position where the portions are sufficiently apart from each other to a closed position where the portions are adjusted to tighten a wrap around the subject's head along the curvature, and wherein the two or more RF coils in each portion are disposed in such manner that when the portions are operated to transition from the open position to the closed position, the RF coils of each portion remain decoupled to each other even along edges of each portion.
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公开(公告)号：US11567155B2
公开(公告)日：2023-01-31
申请号：US17026541
申请日：2020-09-21
发明人： Chad Tyler Harris , Geron Andre Bindseil , Alexander Gyles Panther , Jeff Alan Stainsby , Philip J. Beatty
IPC分类号： G01R33/389 , G01R33/38 , G01R33/3875 , G01R33/421 , G01R33/385
摘要： Described here are systems and methods for mitigating or otherwise removing the effects of short-term magnetic field instabilities caused by oscillations of the cold head in a cryogen-free magnet system used for magnetic resonance systems, such as magnetic resonance imaging (“MRI”) systems, nuclear magnetic resonance (“NMR”) systems, or the like.
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公开(公告)号：US11567152B2
公开(公告)日：2023-01-31
申请号：US17383020
申请日：2021-07-22
发明人： Ian Robert Oliphant Connell , Gilbert Thevathasan , William Wai-Leung Lau , Alexander Gyles Panther
IPC分类号： G01R31/00 , G01R33/34 , A61B5/055 , G01R33/341
摘要： A head coil assembly includes a housing with a lower portion, an upper portion, a left portion, and a right portion, wherein each portion includes two or more radio-frequency (RF) coils, wherein the portions are sized and shaped to adjustably conform to a curvature of the subject's head for magnetic resonance (MR) imaging of the subject's head placed inside the housing, wherein the portions are operable to transition from an open position where the portions are sufficiently apart from each other to a closed position where the portions are adjusted to tighten a wrap around the subject's head along the curvature, and wherein the two or more RF coils in each portion are disposed in such manner that when the portions are operated to transition from the open position to the closed position, the RF coils of each portion remain decoupled to each other even along edges of each portion.
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公开(公告)号：US11428764B2
公开(公告)日：2022-08-30
申请号：US17162051
申请日：2021-01-29
IPC分类号： G01R33/3815 , H01F6/04 , G01R33/38
摘要： A magnetic resonance imaging (MRI) system includes a set of magnet coils for generating a magnetic field. The set of magnet coils are composed of a superconducting material. The system further includes a mechanical cryocooler in thermal contact with the set of magnet coils and operable to reduce and maintain a temperature of the set of magnet coils below a transition temperature of the superconducting material, and an energy storage device coupled to the set of magnet coils. The energy storage device may be capable of receiving and storing energy dissipated from the set of magnet coils during rapid shutdown of the set of magnet coils. The system may also include a controller coupled to the energy storage device. The controller may be programmed to recharge the set of magnet coils using the energy stored in the energy storage device during the rapid shutdown of the set of magnet coils.
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公开(公告)号：US20210349164A1
公开(公告)日：2021-11-11
申请号：US17383020
申请日：2021-07-22
发明人： Ian Robert Oliphant CONNELL , Gilbert Thevathasan , William Wai-Leung LAU , Alexander Gyles Panther
摘要： A head coil assembly includes a housing with a lower portion, an upper portion, a left portion, and a right portion, wherein each portion includes two or more radio-frequency (RF) coils, wherein the portions are sized and shaped to adjustably conform to a curvature of the subject's head for magnetic resonance (MR) imaging of the subject's head placed inside the housing, wherein the portions are operable to transition from an open position where the portions are sufficiently apart from each other to a closed position where the portions are adjusted to tighten a wrap around the subject's head along the curvature, and wherein the two or more RF coils in each portion are disposed in such manner that when the portions are operated to transition from the open position to the closed position, the RF coils of each portion remain decoupled to each other even along edges of each portion.
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公开(公告)号：US11506738B2
公开(公告)日：2022-11-22
申请号：US16164220
申请日：2018-10-18
IPC分类号： G01R33/44 , A61B5/05 , A61B5/00 , G01R33/56 , G01R33/28 , G01R33/20 , G01R33/54 , G01R33/565
摘要： A delta-relaxation magnetic resonance imaging (DREMR) system is provided. The system includes a main field magnet and field shifting coils. A main magnetic field with a strength B0 can be generated using the main filed magnet and the strength B0 of the main magnetic field can be varied through the use of the field-shifting coils. The DREMR system can be used to perform signal acquisition based on a pulse sequence for acquiring at least one of T2*-weighted signals imaging; MR spectroscopy signals; saturation imaging signals and MR signals for fingerprinting. The MR signal acquisition can be augmented by varying the strength B0 of the main magnetic field for at least a portion of the pulse sequence used to acquire the MR signal.
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公开(公告)号：US11435418B2
公开(公告)日：2022-09-06
申请号：US15781405
申请日：2016-01-27
摘要： Optionally adjustable head coil system and methods for enhancing and/or optimizing magnetic resonance imaging, involving a housing, the housing having at least one portion, the at least one portion having a lower portion, an upper portion, and opposing side portions, each at least one portion optionally in movable relation to any other portion for facilitating adjustability, each at least one portion configured to accommodate at least one radio-frequency coil, and the upper and lower portions each optionally configured to overlap and engage the opposing side portions for facilitating decoupling the at least one radio-frequency coil, and a tongue portion optionally in movable relation to any other portion for facilitating adjustability, engageable with the lower portion, and fixably couple-able with a transporter.
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