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公开(公告)号：US11249157B2
公开(公告)日：2022-02-15
申请号：US16570892
申请日：2019-09-13
发明人： Geron André Bindseil , Ian Robert Oliphant Connell , William Bradfield Handler , Chad Tyler Harris
IPC分类号： G01R33/385
摘要： A coil apparatus and methods for magnetic resonance imaging involving a wire winding, the wire winding having at least one of: a hollow cross-section wire and a solid cross-section wire, the solid cross-section wire having at least one of: a solid small cross-section wire and a solid large cross-section wire, the solid large cross-section wire having a thickness greater than that of the solid small cross-section wire, and the solid small cross-section wire disposed in one of adjacent and proximate at least one of the hollow cross-section wire and the solid large cross-section wire, whereby at least one of current density, winding density, and heat extraction are increasable.
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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：US11598831B2
公开(公告)日：2023-03-07
申请号：US17174773
申请日：2021-02-12
IPC分类号： G01R33/36 , G01R33/483 , G01R33/54 , G01R33/341 , G01R33/48 , G01R33/44 , G01R33/34
摘要： A magnetic resonance (MR) imaging system includes a transmit radio frequency (RF) coil assembly comprising multiple capacitor banks each coupled to at least one diode that is characterized by a high breakdown voltage such that when the transmit RF coil assembly applies at least one slice-selecting RF pulse to a portion of a subject placed in the magnet to select a particular slice for MR imaging, the capacitor banks are selectively adjusted to improve an RF transmission characteristics of the RF coil assembly in transmitting the at least one slice-selecting RF pulse. The MR imaging system may further include a receive radio frequency (RF) coil assembly configured to, in response to at least the slice-selecting RF pulse, receive at least one response radio frequency (RF) pulse emitted from the selected slice of the portion of the subject; a housing; a main magnet; gradient coils; and a control unit.
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公开(公告)号：US11378635B2
公开(公告)日：2022-07-05
申请号：US16991967
申请日：2020-08-12
IPC分类号： G01R33/385
摘要： The present disclosure reports on a method to first determine the required electromagnetic stream function, and then iterate on the contouring of the stream function to optimize the force, torque, shielding, and/or mutual inductance of the design after-the-fact without compromising the electromagnetic performance and an electromagnetic coil manufacture according to the method. These parameters are sensitive to the precise positioning of the discrete wires.
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公开(公告)号：US11243283B1
公开(公告)日：2022-02-08
申请号：US16942412
申请日：2020-07-29
发明人： Geron Andre Bindseil , Blaine Alexander Chronik , Ian Robert Oliphant Connell , Andrew Thomas Curtis , William Bradfield Handler , Chad Tyler Harris , Jeff Alan Stainsby , Philip J. Beatty
IPC分类号： G01R33/385 , G01R33/38
摘要： An asymmetric electromagnet system, method, and method of producing an asymmetric electromagnet system, wherein the asymmetric electromagnet system is for generating an imaging magnetic field in an imaging region with an imaging isocentre, the imaging region being asymmetrically positioned within a gradient coil bore inside a magnetic resonance imaging (MRI) system during imaging, the electromagnet assembly comprising: an asymmetric gradient coil configured to generate a gradient field in the asymmetrically positioned imaging region, at least one gradient axis having the gradient field with a constant offset component such that the position at which the gradient field passes through zero is offset with respect to the imaging isocentre of the asymmetrically positioned imaging region.
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公开(公告)号：US11821970B2
公开(公告)日：2023-11-21
申请号：US17645108
申请日：2021-12-20
发明人： Geron André Bindseil , Ian Robert Oliphant Connell , William Bradfield Handler , Chad Tyler Harris
IPC分类号： G01R33/385
CPC分类号： G01R33/3856 , G01R33/3858
摘要： A coil apparatus and methods for magnetic resonance imaging involving a wire winding, the wire winding having at least one of: a hollow cross-section wire and a solid cross-section wire, the solid cross-section wire having at least one of: a solid small cross-section wire and a solid large cross-section wire, the solid large cross-section wire having a thickness greater than that of the solid small cross-section wire, and the solid small cross-section wire disposed in one of adjacent and proximate at least one of the hollow cross-section wire and the solid large cross-section wire, whereby at least one of current density, winding density, and heat extraction are increasable.
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公开(公告)号：US11668775B2
公开(公告)日：2023-06-06
申请号：US17362005
申请日：2021-06-29
CPC分类号： G01R33/3621 , G01R33/34076 , G01R33/3614
摘要： A coil assembly includes: a radio frequency (RF) coil operable to be placed over a portion of a subject; a quarter-wave transformer coupled to the RF coil and configured to transform a characteristic impedance of the RF coil; and a diode placed behind the quarter-wave transformer and away from the RF coil, wherein the diode is operable to: (i) when the diode is forward biased, the diode turns the quarter-wave transformer into an open circuit such that the power amplifier drives the RF coil with sufficient electrical power for the RF coil to transmit an RF pulse into the portion of the subject; and (ii) when the diode is provided zero or revers bias, the diode turns the quarter-wave transformer into a short circuit such that the RF coil is detuned from a Lamor frequency of nuclei of interest immersed in the main magnet.
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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：US11073581B2
公开(公告)日：2021-07-27
申请号：US16419098
申请日：2019-05-22
摘要： A coil assembly includes: a radio frequency (RF) coil operable to be placed over a portion of a subject; a quarter-wave transformer coupled to the RF coil and configured to transform a characteristic impedance of the RF coil; and a diode placed behind the quarter-wave transformer and away from the RF coil, wherein the diode is operable to: (i) when the diode is forward biased, the diode turns the quarter-wave transformer into an open circuit such that the power amplifier drives the RF coil with sufficient electrical power for the RF coil to transmit an RF pulse into the portion of the subject; and (ii) when the diode is provided zero or reverse bias, the diode turns the quarter-wave transformer into a short circuit such that the RF coil is detuned from a Lamor frequency of nuclei of interest immersed in the main magnet.
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