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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：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：US11442125B2
公开(公告)日：2022-09-13
申请号：US17028318
申请日：2020-09-22
发明人： Xiaoyu Yang , Thomas Eastlake , Tsinghua Zheng
IPC分类号： G01R33/34 , G01R33/36 , G01R33/385 , G01R33/422
摘要： Various embodiments of the present disclosure are directed towards a magnetic resonance imaging (MRI) radio frequency (RF) coil configured to operate in at least one of a transmit mode or a receive mode. A first birdcage coil includes a pair of first-birdcage end rings and at least four first-birdcage rungs circumferentially arranged along the first-birdcage end rings. A second birdcage coil including a pair of second-birdcage end rings and at least four second-birdcage rungs circumferentially arranged along the second-birdcage end rings. The first and second birdcage coils neighbor and are spaced by a first non-zero distance along an axis. The axis is surrounded by the first-birdcage end rings and the second-birdcage end rings, and the first non-zero distance is greater than individual lengths of the first and second birdcage coils along the axis.
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公开(公告)号：US20220091203A1
公开(公告)日：2022-03-24
申请号：US17028318
申请日：2020-09-22
发明人： Xiaoyu Yang , Thomas Eastlake , Tsinghua Zheng
IPC分类号： G01R33/34 , G01R33/422 , G01R33/36 , G01R33/385
摘要： Various embodiments of the present disclosure are directed towards a magnetic resonance imaging (MRI) radio frequency (RF) coil configured to operate in at least one of a transmit mode or a receive mode. A first birdcage coil includes a pair of first-birdcage end rings and at least four first-birdcage rungs circumferentially arranged along the first-birdcage end rings. A second birdcage coil including a pair of second-birdcage end rings and at least four second-birdcage rungs circumferentially arranged along the second-birdcage end rings. The first and second birdcage coils neighbor and are spaced by a first non-zero distance along an axis. The axis is surrounded by the first-birdcage end rings and the second-birdcage end rings, and the first non-zero distance is greater than individual lengths of the first and second birdcage coils along the axis.
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公开(公告)号：US11204402B2
公开(公告)日：2021-12-21
申请号：US16816492
申请日：2020-03-12
发明人： Xiaoyu Yang , Tsinghua Zheng , Haoqin Zhu
IPC分类号： G01R33/3415 , G01R33/36 , G01R33/34
摘要： Embodiments relate to cylindrical MRI coil arrays with reduced coupling between coil elements. One example embodiment comprises two or more rows, wherein each row comprises at least three RF coil elements of that row enclosing a cylindrical axis; and a ring comprising an associated portion of each RF coil element of a first row and a second row electrically connected together, wherein the associated portion of each RF coil element of the first row and of each RF coil element of the second row comprises an associated capacitor of that RF coil element, and wherein the associated capacitor of that RF coil element is configured to reduce coupling among the RF coil elements of the first row and the RF coil elements of the second row.
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公开(公告)号：US20210132169A1
公开(公告)日：2021-05-06
申请号：US17007378
申请日：2020-08-31
发明人： Xiaoyu Yang , Tsinghua Zheng
IPC分类号： G01R33/422 , G01R33/34
摘要： Various embodiments of the present disclosure are directed towards a magnetic resonance imaging (MRI) head coil comprising an open shield. A transmit coil surrounds a phased array receive coil and comprises a resonant birdcage structure. The resonant birdcage structure comprises multiple transmit rungs spaced in a first closed path, and inter-rung spacing at one or more first locations on the first closed path is greater than at a remainder of the first closed path. The open shield surrounds the transmit coil and comprises a non-resonant birdcage structure. The non-resonant birdcage structure comprises multiple shield rungs spaced in a second closed path. The shield rungs are elongated in parallel with the transmit rungs, and inter-rung spacing at one or more second locations on the second closed path is greater than at a remainder of the second closed path. Further, the second location(s) respectively and radially border the first location(s).
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