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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：US20220155392A1
公开(公告)日：2022-05-19
申请号：US17649711
申请日：2022-02-02
IPC分类号： G01R33/385 , G01R33/38 , G01R33/3875 , H01F5/04 , H01F41/10
摘要： Magnetic resonance imaging (MRI) systems and methods, involving: a main magnet configured to generate a magnet field for MRI; a transmit radio frequency (RF) coil assembly configured to transmit an RF pulse into a portion of a subject; an RF coil assembly configured to, in response to the an RF pulse, receive MR signals emitted from the portion of the subject; and a gradient coil assembly having coil windings arranged in a radial layer and a first set of electrical connectors embedded in the radial layer to reduce a radial extent occupied by the gradient coil assembly, an electrical connector in the first set of electrical connectors configured to cross over a portion of the coil windings in the radial layer, the first set of electrical connectors configured to drive the coil windings with a current sufficient to generate a perturbation in the magnet field such that the MR signals encode an MR image based on the perturbation, and the radial layer having a depressed area configured to radially constrain the electrical connector.
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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：US11585880B2
公开(公告)日：2023-02-21
申请号：US17649711
申请日：2022-02-02
IPC分类号： G01R33/385 , G01R33/38 , G01R33/3875 , H01F5/04 , H01F41/10
摘要： Magnetic resonance imaging (MRI) systems and methods, involving: a main magnet configured to generate a magnet field for MRI; a transmit radio frequency (RF) coil assembly configured to transmit an RF pulse into a portion of a subject; an RF coil assembly configured to, in response to the an RF pulse, receive MR signals emitted from the portion of the subject; and a gradient coil assembly having coil windings arranged in a radial layer and a first set of electrical connectors embedded in the radial layer to reduce a radial extent occupied by the gradient coil assembly, an electrical connector in the first set of electrical connectors configured to cross over a portion of the coil windings in the radial layer, the first set of electrical connectors configured to drive the coil windings with a current sufficient to generate a perturbation in the magnet field such that the MR signals encode an MR image based on the perturbation, and the radial layer having a depressed area configured to radially constrain the electrical connector.
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公开(公告)号：US11269032B2
公开(公告)日：2022-03-08
申请号：US15983853
申请日：2018-05-18
IPC分类号： G01R33/385 , G01R33/38 , G01R33/3875 , H01F5/04 , H01F41/10
摘要： A magnetic resonance (MR) imaging system includes: a main magnet configured to generate a volume of magnet field suitable for forming MR imaging; a transmit radio frequency (RF) coil assembly configured to transmit at least one RF signal; a receive radio frequency (RF) coil assembly configured to, in response to the at least one RF pulse, receive MR signals; a gradient coil assembly comprising (i) windings of coils arranged in a radial layer, and (ii) a first set of connectors embedded in the radial layer to reduce a radial extent occupied by the gradient coil assembly, the first set of electrical connectors configured to drive the windings of coils; and a control unit coupled to the transmit RF coil assembly, the receive RF coil assembly, and the gradient coils, the control unit configured to synchronously operate the gradient coil assembly, the transmit coil assembly, and the receive coil assembly.
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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：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.
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