公开(公告)号：US20110001479A1

公开(公告)日：2011-01-06

申请号：US12497457

申请日：2009-07-02

申请人： Wai Ha Wong ,  Subramaniam Sukumar

发明人： Wai Ha Wong ,  Subramaniam Sukumar

IPC分类号： G01R33/32

CPC分类号： G01R33/341 ,  G01R33/3628

摘要： A low pass RF ladder coil, which is named as a millipede surface coil, comprises a first and a second conductor end strips running parallel to each other. A set of rung elements are placed between them, alternate rung elements are connected to the first and second strip respectively. The number and spacing of the rung elements are sufficient for resonating the coil at the desired imaging frequency. This millipede surface coil may have 100 or more rung elements. Fixed and variable capacitors are provided for separately tuning and matching the first and second mode resonant frequencies, and for coupling and impedance matching the two modes to external circuits. An active detuning is provided that detunes the ladder coil when a separate RF coil is transmitting.

摘要翻译： 被称为千字表面线圈的低通RF梯形线圈包括彼此平行延伸的第一和第二导体端板。 一组梯级元件放置在它们之间，备用梯级元件分别连接到第一和第二条。 梯级元件的数量和间距足以使线圈以期望的成像频率谐振。 该千足表面线圈可具有100个或更多个梯级元件。 提供固定和可变电容器用于单独调谐和匹配第一和第二模式谐振频率，以及将两种模式耦合和阻抗匹配到外部电路。 提供主动失谐，当单独的RF线圈正在传输时，会使梯形线圈发生故障。

公开(公告)号：US06876200B2

公开(公告)日：2005-04-05

申请号：US10403064

申请日：2003-03-31

申请人： Weston Anderson ,  Wai Ha Wong ,  James Finnigan

发明人： Weston Anderson ,  Wai Ha Wong ,  James Finnigan

IPC分类号： G01R33/34 ,  G01V3/00

CPC分类号： G01R33/34046 ,  G01R33/34023

摘要： A high resolution NMR probe having two or more resonators, an inner resonator which is closely coupled to a sample and is used to stimulate and receive a response from one nuclear species, and an outer resonator to induce transitions in another nuclear species, wherein the resonators may be provided with cooling capability and may be made of superconducting material, and wherein the inner resonator may be a saddle coil or a birdcage coil with capability of being tuned, and wherein the outer resonator may be one or more spiral wound saddle coil.

摘要翻译： 具有两个或更多个谐振器的高分辨率NMR探针，与样品紧密耦合并用于刺激和接收来自一个核物质的响应的内部谐振器和外部谐振器以诱导另一个核物种的转变，其中所述谐振器 可以提供冷却能力并且可以由超导材料制成，并且其中内部谐振器可以是具有调谐能力的鞍形线圈或鸟笼线圈，并且其中外部谐振器可以是一个或多个螺旋形缠绕鞍形线圈。

公开(公告)号：US06285189B1

公开(公告)日：2001-09-04

申请号：US09390066

申请日：1999-09-04

申请人： Wai Ha Wong

发明人： Wai Ha Wong

IPC分类号： A61B5055

CPC分类号： G01R33/34046 ,  G01R33/34007

摘要： A birdcage coil comprises a number of elements in birdcage geometry wherein the density of elements is such that the contribution to the total inductance from the mutual inductance of said legs exceeds 45% by conventional model calculation. To accommodate the desired density of elements, necessary capacitances are obtained from compact structures such as inter-digitated patterns which may be oriented axially or between elements, or from arrangements of element portions on opposite sides of a cylindrical substrate.

摘要翻译： 鸟笼线圈包括鸟笼几何形状中的多个元件，其中元件的密度使得通过常规模型计算对来自所述腿的互感的总电感的贡献超过45％。 为了适应期望的元件密度，从紧凑的结构获得必要的电容，例如可以轴向或元件之间取向的数字化图案，或从圆柱形基板的相对侧上的元件部分的布置。

公开(公告)号：US07501828B1

公开(公告)日：2009-03-10

申请号：US12004150

申请日：2007-12-19

申请人： Wai Ha Wong ,  Alan R. Rath ,  Steven A. Suddarth

发明人： Wai Ha Wong ,  Alan R. Rath ,  Steven A. Suddarth

IPC分类号： G01V3/00

CPC分类号： G01R33/34046 ,  G01R33/34076 ,  G01R33/3657

摘要： A switchable birdcage coil functioning as a transmitter coil and a separate RF surface coil functioning as the receiver coil are utilize in NMR and MRI apparatus. To prevent the switchable birdcage coil from absorbing energy by coupling to the receiver coil or by absorbing power from the RF field produced by the precessing nuclear spins, one or more of the reactive elements of the birdcage coil are switched from a normal reactive impedance state to a high impedance state. The high impedance state is formed by switchably combining the reactive element with a complementary reactive element thereby forming parallel resonant high impedance circuit that is tuned to resonate at the NMR frequency.

摘要翻译： 用作发射器线圈的可切换鸟笼线圈和用作接收器线圈的单独的RF表面线圈在NMR和MRI装置中使用。 为了防止可切换的鸟笼线圈通过耦合到接收器线圈而吸收能量，或者通过从由进动的核自旋产生的RF场吸收功率，鸟笼线圈的一个或多个无功元件从正常的无功阻抗状态切换到 高阻抗状态。 高阻抗状态通过可变地组合无功元件与互补电抗元件形成，从而形成并联谐振高阻抗电路，其被调谐以在NMR频率下谐振。

公开(公告)号：US06735851B2

公开(公告)日：2004-05-18

申请号：US10043622

申请日：2002-01-08

申请人： Marco A. Romo ,  Wai Ha Wong

发明人： Marco A. Romo ,  Wai Ha Wong

IPC分类号： H01F706

CPC分类号： G01R33/34076 ,  G01R33/34007 ,  G01R33/34023 ,  G01R33/34046 ,  G01R33/34092 ,  G01R33/3453 ,  Y10T29/43 ,  Y10T29/435 ,  Y10T29/49012 ,  Y10T29/49071 ,  Y10T29/49073

摘要： Superconducting birdcage coil with low-pass and high-pass coil configurations are formed by using strips each with an elongated sapphire substrate with a layer of a high temperature superconductor (HTS) material grown in a wavy pattern over its entire length on one of its main surfaces. A low-pass coil is formed with a pair of ring elements made of an electrically conductive metal and a plurality of such strips arranged parallel to one another and interconnecting these ring elements at junctions which are spaced peripherally along each of the rings. At each of the junctions, the ring element and the HTS layer form a capacitance. A high-pass coil is formed by a plurality of such strips each with electrodes of the HTS material also grown at two end positions separated from each other on the other main surface of its sapphire substrates. These strips are arranged parallel to each other and sequentially around a central axis, each lying in a plane which includes the center axis. The electrodes and the HTS layers on mutually adjacent pairs of strips are closely in face-to-face relationship so as to serve as the ring part of a birdcage configuration containing capacitors.

摘要翻译： 通过使用带有细长蓝宝石衬底的条带形成具有低通和高通线圈构造的超导鸟笼线圈，该蓝宝石衬底具有在其主体之一上以波长图案长度生长的高温超导体（HTS）材料层 表面。 低通线圈形成有由导电金属制成的一对环形元件和彼此平行布置的多个这样的条，并且在沿着每个环周向间隔开的连接处互连这些环形元件。 在每个结点处，环形元件和HTS层形成电容。 高通线圈由多个这样的带形成，每个带有HTS材料的电极也在其蓝宝石衬底的另一个主表面上彼此分离的两个端部位置处生长。 这些条彼此平行地布置并且依次围绕中心轴线布置，每个中心轴线位于包括中心轴线的平面中。 相互邻近的条带上的电极和HTS层紧密地面对面地关系，以便作为包含电容器的鸟笼配置的环部分。

公开(公告)号：US06377047B1

公开(公告)日：2002-04-23

申请号：US09589847

申请日：2000-06-08

申请人： Wai Ha Wong ,  Marco A. Romo

发明人： Wai Ha Wong ,  Marco A. Romo

IPC分类号： G01V300

CPC分类号： G01R33/34076 ,  G01R33/34007 ,  G01R33/34023 ,  G01R33/34046 ,  G01R33/34092 ,  G01R33/3453 ,  Y10T29/43 ,  Y10T29/435 ,  Y10T29/49012 ,  Y10T29/49071 ,  Y10T29/49073

摘要： Superconducting birdcage coil with low-pass and high-pass coil configurations are formed by using strips each with an elongated sapphire substrate with a layer of a high temperature superconductor (HTS) material grown in a wavy pattern over its entire length on one of its main surfaces. A low-pass coil is formed with a pair of ring elements made of an electrically conductive metal and a plurality of such strips arranged parallel to one another and interconnecting these ring elements at junctions which are spaced peripherally along each of the rings. At each of the junctions, the ring element and the HTS layer form a capacitance. A highpass coil is formed by a plurality of such strips each with electrodes of the HTS material also grown at two end positions separated from each other on the other main surface of its sapphire substrates. These strips are arranged parallel to each other and sequentially around a central axis, each lying in a plane which includes the center axis. The electrodes and the HTS layers on mutually adjacent pairs of strips are closely in face-to-face relationship so as to serve as the ring part of a birdcage configuration containing capacitors.

摘要翻译： 通过使用带有细长蓝宝石衬底的条带形成具有低通和高通线圈构造的超导鸟笼线圈，该蓝宝石衬底具有在其主体之一上以波长图案长度生长的高温超导体（HTS）材料层 表面。 低通线圈形成有由导电金属制成的一对环形元件和彼此平行布置的多个这样的条，并且在沿着每个环周向间隔开的连接处互连这些环形元件。 在每个结点处，环形元件和HTS层形成电容。 高通线圈由多个这样的条形成，每个带有HTS材料的电极也在其蓝宝石衬底的另一个主表面上彼此分离的两个端部位置处生长。 这些条彼此平行地布置并且依次围绕中心轴线布置，每个中心轴线位于包括中心轴线的平面中。 相互邻近的条带上的电极和HTS层紧密地面对面地关系，以便作为包含电容器的鸟笼配置的环部分。

公开(公告)号：US06236206B1

公开(公告)日：2001-05-22

申请号：US09298619

申请日：1999-04-23

申请人： Spencer C. Hartman ,  Wai Ha Wong

发明人： Spencer C. Hartman ,  Wai Ha Wong

IPC分类号： G01V300

CPC分类号： G01R33/3628 ,  G01R33/34046

摘要： A birdcage coil is globally tuned by a tuning structure to maintain constant RF phase shift for each leg conductor of the birdcage while containing a load. The birdcage coil may be globally tuned by adjusting the capacitances or inductances in a symmetrical manner.

摘要翻译： 鸟笼线圈由调谐结构全局调谐，以在包含负载的同时保持鸟笼的每个腿部导体的恒定的RF相移。 可以通过以对称方式调整电容或电感来全局调谐鸟笼线圈。

公开(公告)号：US20120153955A1

公开(公告)日：2012-06-21

申请号：US12969473

申请日：2010-12-15

申请人： Wai Ha Wong

发明人： Wai Ha Wong

IPC分类号： G01R33/44

CPC分类号： G01R33/34046 ,  G01R33/34076

摘要： According to one aspect, a magnetic resonance imaging (MRI) scanner includes a short birdcage (e.g. millipede) distributed-capacitance radio-frequency (RF) coil formed from one or more patterned planar conductive foils. The transverse extent (e.g. diameter) of the coil is at least a factor of 3, for example about a factor of 10, larger than the longitudinal (z-axis) extent of the coil. Flux-return gaps may be provided between the sample measurement volume defined by the coil and RF shields adjacent to the sample measurement volume, to confine the RF magnetic field to the sample measurement volume. Exemplary coils described herein are particularly suited for very high-frequency MRI measurements.

摘要翻译： 根据一个方面，磁共振成像（MRI）扫描仪包括由一个或多个图案化的平面导电箔形成的短鸟笼（例如千足虫）分布电容射频（RF）线圈。 线圈的横向范围（例如直径）至少比线圈的纵向（z轴）范围大3倍，例如大约10倍。 可以在由线圈限定的样品测量体积和与样品测量体积相邻的RF屏蔽之间提供通量回流间隙，以将RF磁场限制到样品测量体积。 本文描述的示例性线圈特别适用于非常高频的MRI测量。

公开(公告)号：US06980000B2

公开(公告)日：2005-12-27

申请号：US10425780

申请日：2003-04-29

申请人： Wai Ha Wong ,  Jimmy Leung ,  Alexander Funk ,  Knut Mehr

发明人： Wai Ha Wong ,  Jimmy Leung ,  Alexander Funk ,  Knut Mehr

IPC分类号： G01R33/34 ,  G01V3/00

CPC分类号： G01R33/34053 ,  G01R33/34069 ,  G01R33/341

摘要： NMR coils are formed from transmission line comprising a tuned LC circuit determined substantially from the distributed capacitance and inductance of the transmission line operated in common mode. Introduction of gaps staggered between opposite conductors of 2-conductor transmission line contribute a desired distributed capacitance with reduced effective inductance to sustain resonant behavior at higher frequency than achievable with conventionally tuned coils and with relaxation of dimensional constraints as the resonant half wavelength approaches coil dimensions.

摘要翻译： NMR线圈由传输线形成，该传输线包括基本上由在共模操作的传输线的分布电容和电感确定的调谐LC电路。 在2导体传输线的相对导体之间交错的间隙的引入有助于降低有效电感的期望的分布电容，以维持较高频率的谐振特性，而不是用常规调谐线圈实现的，并且随着谐振半波长接近线圈尺寸而松弛尺寸约束。

公开(公告)号：US20130082709A1

公开(公告)日：2013-04-04

申请号：US13584126

申请日：2012-08-13

申请人： Alan R. RATH ,  Wai Ha WONG ,  Weston A. ANDERSON

发明人： Alan R. RATH ,  Wai Ha WONG ,  Weston A. ANDERSON

IPC分类号： G01R33/48 ,  G01R33/341

CPC分类号： G01R33/34076 ,  G01R33/5616

摘要： A magnetic resonance imaging (MRI) apparatus comprises a plurality of cylindrical electromagnetic coils arranged in a coaxial configuration around a sample region. The coils are used to capture resonance signals from a sample at different times according to a geometric echo effect. The measurements can then be combined to produce an MRI signal.

摘要翻译： 磁共振成像（MRI）装置包括以样品区域周围的同轴构造布置的多个圆柱形电磁线圈。 线圈用于根据几何回波效应在不同时间从样品捕获共振信号。 然后可以将测量结合以产生MRI信号。