-
公开(公告)号：US11802923B2
公开(公告)日：2023-10-31
申请号：US17819690
申请日：2022-08-15
IPC分类号： G01V3/175 , G01R33/28 , G01R33/385 , G01R33/42
CPC分类号： G01R33/288 , G01R33/385 , G01R33/42 , G01V3/175
摘要： Systems and methods for imaging a subject with a magnetic resonance imaging system using magnetic field gradients generated by one or more gradient coils operating with gradient coil settings, such as gradient amplitudes and gradient slew rates, above a threshold at which peripheral nerve stimulation is likely to be induced in the subject. A dielectric assembly is positioned adjacent a skin surface of the subject such that the dielectric assembly attenuates the local electric fields induced by the magnetic field gradients, which would be likely to induce PNS when the dielectric assembly is not arranged adjacent the skin surface of the subject. As a result of the dielectric assembly placed adjacent the skin surface of the subject, the gradient coil settings can be increased above the threshold without inducing PNS in the subject.
-
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.
-
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.
-
公开(公告)号：US11662405B2
公开(公告)日：2023-05-30
申请号：US16990198
申请日：2020-08-11
IPC分类号： G01R33/38 , G01R33/381 , G06F30/10
CPC分类号： G01R33/3802 , G01R33/381 , G06F30/10
摘要： A method of manufacturing an electromagnet coil for use in a magnetic resonance imaging (MRI) system includes: generating a coil surface representation defining a surface to contain the electromagnet coil; defining a set of performance metric functions, the set including a mutual inductance function defining mutual inductance between the electromagnet coil and a second electromagnet coil; defining a performance functional based on the coil surface representation and the set of performance metric functions; optimizing the performance functional; generating a current density pattern over the coil surface representation based on the optimized performance functional; and obtaining coil windings defining the electromagnet coil from the current density pattern.
-
公开(公告)号：US11650273B2
公开(公告)日：2023-05-16
申请号：US17658054
申请日：2022-04-05
IPC分类号： G01R33/3875 , A61B5/055 , G01R33/38 , G01R33/381
CPC分类号： G01R33/3875 , A61B5/055 , G01R33/3806 , G01R33/381
摘要： Systems and methods involving: a housing having a bore in which a subject to be imaged is placed; a main magnet configured to generate a volume of magnetic field within the bore, the volume of magnetic field having inhomogeneity below a defined threshold; gradient coils configured to linearly vary the volume of magnetic field as a function of spatial location; pulse-generating coils configured to generate and apply radio frequency (RF) pulses to the volume of magnetic field in sequence to scan the portion of the subject; shim gradient coils configured to perturb a spatial distribution of the linearly varying volume of magnetic field; and a control unit configured to operate the gradient coils, pulse-generating coils, and shim gradient coils such that only the user-defined region within the volume of magnetic field is imaged.
-
公开(公告)号：US11624794B2
公开(公告)日：2023-04-11
申请号：US17445249
申请日：2021-08-17
发明人： Chad Tyler Harris , Jeff Alan Stainsby , Andrew Thomas Curtis , Philip J. Beatty , Curtis Nathan Wiens
摘要： An automatic protocolling system and methods involving a processor operable by way of a set of executable instructions storable in relation to a nontransient memory device, the set of executable instructions configuring the processor to: receive information relating to an initial protocol comprising an initial ordering of a plurality of sequences, the information comprising data relating to an interaction extent value of at least one of an imaging system and a patient as a function of time corresponding to each sequence in the plurality of sequences, the data relating to a time-integrated effect of each sequence in the plurality of sequences; and dynamically determine an alternative protocol comprising an alternative ordering of the plurality of sequences based on the time-integrated effect, whereby an alternative protocol is provided.
-
公开(公告)号：US20210286031A1
公开(公告)日：2021-09-16
申请号：US17174849
申请日：2021-02-12
摘要： Some implementations provide an MRI system that includes: a housing having a bore accommodating a portion of a subject; a main magnet enclosed by said housing and configured to generate a substantially uniform magnet field within the bore; a gradient sub-system to provide perturbations to the substantially uniform magnet field; a flexible coil assembly configured to (i) receive radio frequency (RF) signals from the subject in response to the portion of the subject being scanned, and (ii) generate and apply B0 shimming to improve a field homogeneity of the substantially uniform magnetic field; and a control unit configured to: drive the gradient sub-system using a gradient waveform; and receive measurement results responsive to the gradient waveform such that a coupling between the gradient sub-system and the flexible coil assembly is determined and subsequently reduced in response to the determined coupling exceeding a pre-determined threshold.
-
公开(公告)号：US11061092B1
公开(公告)日：2021-07-13
申请号：US16736663
申请日：2020-01-07
IPC分类号： G01V3/00 , G01R33/3875 , G01R33/48
摘要： A fat saturation method for a magnetic resonance imaging system having a main magnet providing a magnetic field B0 The method includes: driving a shim coil assembly with a first set of shimming currents to sufficiently alter a B0 field inhomogeneity of the magnetic field B0 within a region that includes a first imaging volume of interest such that water saturation inside the region is reduced from before the first set of shimming currents are applied; applying a fat saturation pulse to the region; identifying the first imaging volume of interest from the region; driving the shim coil assembly with a second set of shimming currents to alter the B0 field inhomogeneity of the magnetic field B0 within the first imaging volume of interest such that the B0 field inhomogeneity within the first imaging volume of interest is reduced; and obtaining magnetic resonance signals from the first imaging volume of interest.
-
公开(公告)号：US20210208223A1
公开(公告)日：2021-07-08
申请号：US16736663
申请日：2020-01-07
IPC分类号： G01R33/3875 , G01R33/48
摘要： A fat saturation method for a magnetic resonance imaging system having a main magnet providing a magnetic field B0 The method includes: driving a shim coil assembly with a first set of shimming currents to sufficiently alter a B0 field inhomogeneity of the magnetic field B0 within a region that includes a first imaging volume of interest such that water saturation inside the region is reduced from before the first set of shimming currents are applied; applying a fat saturation pulse to the region; identifying the first imaging volume of interest from the region; driving the shim coil assembly with a second set of shimming currents to alter the B0 field inhomogeneity of the magnetic field B0 within the first imaging volume of interest such that the B0 field inhomogeneity within the first imaging volume of interest is reduced; and obtaining magnetic resonance signals from the first imaging volume of interest.
-
10.发明授权公开(公告)号：US11860254B2
公开(公告)日：2024-01-02
申请号：US17810525
申请日：2022-07-01
IPC分类号： G01R33/3815 , G01R33/38 , H01F6/04
CPC分类号： G01R33/3815 , G01R33/3804 , 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.
-
-
-
-
-
-
-
-
-
搜索结果
29 条记录 (耗时 0.017 秒)
