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公开(公告)号：US11592504B2
公开(公告)日：2023-02-28
申请号：US17202793
申请日：2021-03-16
IPC分类号： G01R33/34 , G01R33/483 , G01R33/422
摘要： Various embodiments of the present disclosure are directed towards a magnetic resonance imaging (MRI) radio frequency (RF) coil. The MRI RF coil comprises a first conductive ring and a second conductive ring. A plurality of rung groups extend between the first and second conductive rings. The plurality of rung groups are spaced uniformly about the first conductive ring. Each of the plurality of rung groups comprises a plurality of conductive rungs extending between and connected to the first and second conductive rings. The plurality of conductive rungs of each of the plurality of rung groups are azimuthally separated from one another by a first azimuth angle. Each of the plurality of rung groups is separated from a neighboring rung group by a spacing that forms a window. Each of the windows have a second azimuth angle that is greater than the first azimuth angle.
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公开(公告)号：US11156682B2
公开(公告)日：2021-10-26
申请号：US15933860
申请日：2018-03-23
发明人： Xiaoyu Yang , Tsinghua Zheng , Haoqin Zhu
IPC分类号： G01R33/36 , G01R33/341 , G01R33/34 , G01R33/3415
摘要： A magnetic resonance imaging (MRI) radio frequency (RF) coil array configured to operate in a transmit (Tx) mode or in a receive (Rx) mode, comprising: a plurality of rows configured in an anatomy-specific shape, a row including a plurality of RF coil elements, an RF coil element including an LC coil and a magnitude/phase control component, where the LC coil, upon resonating with a primary coil at the working frequency of the primary coil, generates a local amplified Tx field based on an induced current in the LC coil, where a magnitude or a phase of the induced current is independently adjustable, where the magnitude/phase control component is configured to adjust the magnitude or phase of the induced current, and where the magnitude or phase of the induced current of a first RF coil element is independently adjustable from that of a second, different RF coil element.
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公开(公告)号：US20210318398A1
公开(公告)日：2021-10-14
申请号：US17202864
申请日：2021-03-16
发明人： Xiaoyu Yang , Mathew Finnerty , Tsinghua Zheng
摘要： Various embodiments of the present disclosure are directed towards a magnetic resonance imaging (MRI) radio frequency (RF) coil array configured to operate in at least one of a transmit mode or a receive mode on a cylindrical former. The MRI RF coil array includes at first row of RF coil elements. Each row of RF coil elements includes at least three RF coil elements that circumferentially surround a cylindrical axis. The MRI RF coil array also includes a first birdcage coil that circumferentially surrounds the first row of RF coil elements. Each RF coil element of the first row is configured to inductively couple to the first birdcage coil and to each other RF coil elements. The first birdcage coil has an impedance configured to negate inductive coupling between the RF coil elements of the first row.
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公开(公告)号：US20210302514A1
公开(公告)日：2021-09-30
申请号：US17202793
申请日：2021-03-16
IPC分类号： G01R33/34 , G01R33/422 , G01R33/483
摘要： Various embodiments of the present disclosure are directed towards a magnetic resonance imaging (MRI) radio frequency (RF) coil. The MRI RF coil comprises a first conductive ring and a second conductive ring. A plurality of rung groups extend between the first and second conductive rings. The plurality of rung groups are spaced uniformly about the first conductive ring. Each of the plurality of rung groups comprises a plurality of conductive rungs extending between and connected to the first and second conductive rings. The plurality of conductive rungs of each of the plurality of rung groups are azimuthally separated from one another by a first azimuth angle. Each of the plurality of rung groups is separated from a neighboring rung group by a spacing that forms a window. Each of the windows have a second azimuth angle that is greater than the first azimuth angle.
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公开(公告)号：US20210072330A1
公开(公告)日：2021-03-11
申请号：US17012873
申请日：2020-09-04
IPC分类号： G01R33/34 , G01R33/36 , G01R33/30 , G01R33/341
摘要： A system for positioning of an RF surface coil to several imaging tables has a table coupling device with first and second sides and table engagement features. The first side has a planar surface to mate with a first imaging table. The second side has a contoured surface having a curvature to mate with a second imaging table. A coil coupling device selectively couples to each of the first and second sides of the table coupling device in respective first and second configurations. The coil coupling device selectively rotates about a rotation axis perpendicular to the first side, and selectively translates along a translation axis perpendicular to the rotation axis. The coil coupling device has one or more coil engagement features to selectively engage the RF surface coil in each of a horizontal position and vertical position of the RF surface coil with respect to the table coupling device.
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公开(公告)号：US20200096584A1
公开(公告)日：2020-03-26
申请号：US16573237
申请日：2019-09-17
发明人： Xiaoyu Yang , Tsinghua Zheng , Haoqin Zhu
IPC分类号： G01R33/36
摘要： Embodiments relate to MRI RF multi-tune coil elements, arrays, and MRI systems comprising such elements. One example embodiment comprises: a LC coil comprising one or more matching points; and two or more matching branches, each of which connected to the LC coil at matching point of the one or more matching points that is associated with that matching branch, wherein each matching branch comprises an associated set of one or more RF traps configured to block each frequency of two or more frequencies other than a frequency associated with that matching branch, and wherein each matching branch is configured to match to an associated predetermined impedance at the frequency associated with that matching branch.
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公开(公告)号：US10386430B2
公开(公告)日：2019-08-20
申请号：US15583345
申请日：2017-05-01
发明人： Xiaoyu Yang , Haoqin Zhu , Tsinghua Zheng
IPC分类号： G01V3/00 , G01R33/36 , G01R33/34 , G01R33/28 , G01R33/341 , G01R33/3415
摘要： A magnetic resonance imaging (MRI) radio frequency (RF) coil array configured to operate in a transmit (Tx) mode or in a receive (Rx) mode, the MRI RF coil array comprising at least one single-layer RF coil element. The at least one RF coil element includes a resonant LC coil, a matching Tx/Rx switch circuit, and a preamplifier. The matching and Tx/Rx switch circuit, when operating in Tx mode, electrically isolates the LC coil from the preamplifier upon the LC coil resonating with a primary coil at the primary coil's working frequency. The LC coil, upon resonating with the primary coil at the working frequency, generates a local amplified Tx field based on an induced current in the LC coil. A magnitude or a phase of the induced current is independently adjustable. The matching and Tx/Rx switch circuit, when in Rx mode, electrically connects the LC coil with the preamplifier.
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公开(公告)号：US20180321339A1
公开(公告)日：2018-11-08
申请号：US15971075
申请日：2018-05-04
发明人： Xiaoyu Yang , Haoqin Zhu , Tsinghua Zheng
CPC分类号： G01R33/34084 , G01R33/34076 , G01R33/3614 , G01R33/3628 , G01R33/3642
摘要： A single-layer magnetic resonance imaging (MRI) radio frequency (RF) coil element configured to operate in a transmit (Tx) mode and a receive (Rx) mode, the coil element comprising: an LC coil and a failsafe circuit electrically connected with the LC coil, where the LC coil, upon resonating with a primary coil of an MRI system, generates a local amplified Tx field based on an induced current generated in the LC coil by inductive coupling between the LC coil and the primary coil, where the failsafe circuit provides, upon injection of a forward DC bias current into the failsafe circuit, a first impedance, and upon the absence of the forward DC bias current, a second, higher impedance; where the failsafe circuit, upon the single-layer MRI RF coil array element being disconnected from an MRI system, provides the second, higher impedance, and reduces the magnitude of the induced current.
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公开(公告)号：US20180081008A1
公开(公告)日：2018-03-22
申请号：US15706005
申请日：2017-09-15
发明人： Xiaoyu Yang , Haoqin Zhu , Tsinghua Zheng
IPC分类号： G01R33/36 , A61B5/00 , G01R33/34 , G01R33/3415 , G01R33/48
CPC分类号： G01R33/3657 , A61B5/0035 , A61B5/055 , A61B5/6814 , A61B5/6822 , A61B5/6823 , A61B2576/00 , G01R33/288 , G01R33/34046 , G01R33/34076 , G01R33/3415 , G01R33/48
摘要： Methods and other embodiments control a member of a plurality of MRI transmit (Tx)/receive (Rx) coil array elements to operate in a resonant Tx mode or in a non-resonant Tx mode. The member of the plurality of MRI Tx/Rx coil array elements, upon resonating with a primary coil at a working frequency, generates a local amplified Tx field based on an induced current in the member of the plurality of MRI Tx/Rx coil array elements. The member of the plurality of MRI Tx/Rx coil array elements includes at least one magnitude/phase control circuit connected in parallel. Upon detecting that the member of the plurality of MRI Tx/Rx coil array elements is operating in resonant Tx mode, embodiments randomly control a member of the at least one magnitude/phase control circuit to vary the magnitude or phase of the local amplified Tx field over a range of magnitudes or phases.
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公开(公告)号：US20170146622A1
公开(公告)日：2017-05-25
申请号：US15339107
申请日：2016-10-31
发明人： Xiaoyu Yang , Chris Allen
CPC分类号： G01R33/3628 , G01R33/34069 , G01R33/3415 , G01R33/365
摘要： Example apparatus and magnetic resonance imaging (MRI) radio frequency (RF) coils concern controlling current magnitude at different sections in one MRI RF coil. In one embodiment, an MRI RF coil comprises a plurality of loop coils configured to transmit or receive an RF signal. A member of the plurality of loop coils comprises an inductor and at least one capacitor. The MRI RF coil further comprises at least one coaxial transmission line that electrically couple in series a first member of the plurality of loop coils with a second, different member of the plurality of loop coils. The at least one coaxial transmission line has a length that is one-quarter wavelength (λ/4) of the RF signal, or an odd integer multiple of λ/4 of the RF signal.
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