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公开(公告)号：US11486947B2
公开(公告)日：2022-11-01
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：US11372065B2
公开(公告)日：2022-06-28
申请号：US17151307
申请日：2021-01-18
发明人： Xiaoyu Yang , Tsinghua Zheng
IPC分类号： G01R33/421 , G01R33/36
摘要： Various embodiments of the present disclosure are directed towards a radio frequency (RF) coil comprising a first combination coil and a second combination coil. The first combination coil comprises a first resonant coil and a first resonant shield coupled inductively or by a capacitor, and the first combination coil has a first resonant frequency and a second resonant frequency. The second combination coil comprises a second resonant coil and a second resonant shield coupled inductively or by a capacitor, and the second combination coil has a third resonant frequency and a fourth resonant frequency. The first and second resonant coils are inductively coupled to each other and respectively to the second and first resonant shields. The first and third resonant working frequencies are the same, and the second and fourth resonant isolation frequencies are such that inductive coupling between the first and second resonant coils is negated.
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公开(公告)号：US11204401B2
公开(公告)日：2021-12-21
申请号：US16815460
申请日：2020-03-11
发明人： Xiaoyu Yang , Tsinghua Zheng , Haoqin Zhu
IPC分类号： G01R33/3415 , G01R33/34 , G01R33/36
摘要： Embodiments relate to cylindrical MRI coils with at least one row as a birdcage row in a transmit mode. One example embodiment is a MRI Radio Frequency (RF) coil array comprising two or more rows of four or more RF coil elements each. Each of the RF coil elements can be configured to resonate at a working frequency of the coil array in a receive mode. At least one of the rows can be configured as a birdcage coil in the transmit mode, and the two or more rows can inductively couple together such that all the two or more rows can resonate together in the transmit mode at the working frequency.
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54.发明授权公开(公告)号：US10942233B2
公开(公告)日：2021-03-09
申请号：US16266346
申请日：2019-02-04
发明人： Xiaoyu Yang , Haoqin Zhu , Tsinghua Zheng
摘要： Embodiments relate to multi-turn magnetic resonance imaging (MRI) radio frequency (RF) coil arrays employing ring decoupling, and MRI apparatuses employing such coil arrays. One example embodiment comprises: four or more RF coil elements that enclose a cylindrical axis, wherein each RF coil element comprises a first capacitor of that RF coil element and a loop comprising at least two turns; and a ring structure that facilitates decoupling of the RF coil elements, wherein each RF coil element is adjacent to two neighboring RF coil elements and is non-adjacent to one or more other coil elements, wherein each RF coil element has a shared side in common with the ring structure, wherein the shared side comprises a second capacitor of that RF coil element with a capacitance selected to mitigate inductive coupling between that RF coil element and non-adjacent RF coil elements.
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公开(公告)号：US20200292642A1
公开(公告)日：2020-09-17
申请号：US16815460
申请日：2020-03-11
发明人： Xiaoyu Yang , Tsinghua Zheng , Haoqin Zhu
IPC分类号： G01R33/3415 , G01R33/34 , G01R33/36
摘要： Embodiments relate to cylindrical MRI coils with at least one row as a birdcage row in a transmit mode. One example embodiment is a MRI Radio Frequency (RF) coil array comprising two or more rows of four or more RF coil elements each. Each of the RF coil elements can be configured to resonate at a working frequency of the coil array in a receive mode. At least one of the rows can be configured as a birdcage coil in the transmit mode, and the two or more rows can inductively couple together such that all the two or more rows can resonate together in the transmit mode at the working frequency.
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56.发明申请公开(公告)号：US20190331744A1
公开(公告)日：2019-10-31
申请号：US16387800
申请日：2019-04-18
发明人： Xiaoyu Yang , Chris Allen , Tsinghua Zheng , Haoqin Zhu
IPC分类号： G01R33/34 , G01R33/36 , G01R33/385
摘要： Embodiments relate to birdcage coils with in-plane open RF shielding capable of operating at 7T and higher field strength. One example embodiment comprises a first birdcage circuit and second birdcage circuit, each comprising two rings, N rungs that electrically connect the two rings of that circuit, a plurality of capacitors in the first birdcage circuit to form a first birdcage coil, and an optional plurality of capacitors in the second birdcage circuit to form a second birdcage coil when included or a non-resonant RF shield when omitted, wherein the first birdcage circuit is electrically isolated from the second birdcage circuit, wherein the first birdcage circuit and the second birdcage circuit have a common cylindrical axis, and wherein the N rungs of the second birdcage circuit are azimuthally rotated through a first angle relative to the N rungs of the first birdcage circuit.
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57.发明申请公开(公告)号：US20190257898A1
公开(公告)日：2019-08-22
申请号：US16278763
申请日：2019-02-19
发明人： Xiaoyu Yang , Haoqin Zhu , Tsinghua Zheng
摘要： Embodiments relate to magnetic resonance imaging (MRI) radio frequency (RF) coil arrays. One example coil array comprises: at least one row of RF coil elements arranged radially around a cylindrical axis, wherein each row comprises: at least four RF coil elements circumferentially enclosing the cylindrical axis, wherein each RF coil element of that row is configured to operate in a Tx mode and in a Rx mode, wherein, in the Rx mode, each RF coil element of that row is tuned to a working frequency of the MRI RF coil array, and wherein, in the Tx mode, each RF coil element of that row is tuned to an additional frequency that is different than the working frequency, wherein the additional frequency is such that, a mode frequency of a selected mode resulting from coupling among the RF coil elements of that row is at the working frequency.
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公开(公告)号：US20180364318A1
公开(公告)日：2018-12-20
申请号：US16009546
申请日：2018-06-15
发明人： Xiaoyu Yang , Tsinghua Zheng , Haoqin Zhu
IPC分类号： G01R33/36
摘要： An MRI RF coil array for use in a multi-channel MRI system, comprising a plurality of coils arranged in a M by N array, the number of columns corresponding with the number of channels in the MRI system. Columns are aligned with the B0 field. The plurality of coils are configured as a plurality of combined coils, corresponding with the number of columns, comprising a coil in a first row of the array connected with a coil in each of the remaining rows. The column position of each coil of a combined coil is distinct from the column position of each other coil of the combined coil. Coils of a combined coil are disjoint from the coils of each, other, combined coil. A combined coil is configured to connect with a corresponding member of the plurality of Rx channels, and is decoupled from each, other combined coil.
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59.发明申请公开(公告)号：US20180275226A1
公开(公告)日：2018-09-27
申请号：US15923437
申请日：2018-03-16
发明人： Xiaoyu Yang , Tsinghua Zheng , Haoqin Zhu
CPC分类号： G01R33/288 , A61B5/055 , A61B5/06 , A61M25/0127 , A61M25/09 , G01R33/285 , G01R33/34046 , G01R33/3415 , G01R33/3628 , G01R33/48
摘要： A method for controlling an interventional magnetic resonance imaging (iMRI) system configured to control a heating mode of an iMRI guidewire, the method comprising: controlling, during an iMRI procedure, a magnitude of an induced current in a single-layer MRI radio frequency (RF) coil used in the iMRI procedure, or a phase of the induced current by adjusting at least one of: a difference between a working frequency of a whole body coil (WBC) used in the iMRI procedure and a resonant frequency of the single layer MRI RF coil, a coil loss resistance of the single layer MRI RF coil, or a blocking impedance of an LC circuit connected in parallel with the single-layer MRI RF coil; and controlling a heating mode of the guidewire based, at least in part on the magnitude or phase.
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公开(公告)号：US10048333B2
公开(公告)日：2018-08-14
申请号：US14728627
申请日：2015-06-02
发明人： Hiroyuki Fujita , Oliver Heid , Xiaoyu Yang
摘要： Example minimalist magnetic resonance imaging (MRI) radio frequency (RF) coils that are connected to off coil circuitry by capacitive coupling plates are described. A minimalist MRI RF coil may have some elements that form a traditional coil located off the coil in off coil circuitry. An MR procedure may involve a number of minimalist MRI RF coils that are moved through an excitation zone as a patient is moved through the excitation zone. Example minimalist MRI RF coils may be selectively connected to off coil circuitry while the coils are in the excitation zone. The coupling may be made by capacitive coupling plates. Unlike conventional systems, example systems have capacitive coupling plates with properties that facilitate maintaining a constant capacitance between a coupling plate associated with the coil and coupling plates associated with the off coil circuitry as the coupling plates move relative to each other.
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