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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。
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公开(公告)号：US06552544B2
公开(公告)日：2003-04-22
申请号：US09828319
申请日：2001-04-05
申请人： Wai Ha Wong , Alan R. Rath
发明人： Wai Ha Wong , Alan R. Rath
IPC分类号： G01V300
CPC分类号： G01R33/3642 , G01R33/3628 , G01R33/3635 , G01R33/3657
摘要： A detunable coil assembly includes a main coil which resonates at a specified resonance frequency and a switchable detuning coil which, when switched on, becomes inductively coupled to the main coil and serves to detune it from its resonance frequency. The detuning coil and the main coil are electrically insulated from each other. The main coil may be of a multiply tuned kind and it may be detuned from more than one of its specified resonance frequencies at the same time by switching on the detuning coil.
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公开(公告)号：US5057778A
公开(公告)日：1991-10-15
申请号：US501681
申请日：1990-03-29
申请人： Alan R. Rath
发明人： Alan R. Rath
CPC分类号： G01R33/3635
摘要： A double-tuned dual port segmented coil for NMR studies of a volume distributed sample is obtained by coupling corresponding junctions of respective segments of two segmented loop portions with legs comprising L.sub.x C.sub.x L.sub.x series combination. Four segment coil portions so coupled support two isolated input ports across C.sub.x for adjacent such legs.
摘要翻译： 通过将两个分段环部分的各个段的相应连接部分与包含LxCxLx系列组合的腿部相结合来获得体积分布样品的NMR研究的双调谐双端口分段线圈。 如此耦合的四个段线圈部分支持跨过Cx的两个隔离的输入端口用于相邻的这种支腿。
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公开(公告)号：US5166621A
公开(公告)日：1992-11-24
申请号：US603966
申请日：1990-10-26
申请人： Robert S. Codrington , Alan R. Rath
发明人： Robert S. Codrington , Alan R. Rath
CPC分类号： G01R33/3635
摘要： A saddle coil for multiple tuned response is realized by a segmented sequence of first LC elements each tuned to exhibit a low impedance at .omega..sub.1 and a second set of LC elements, each tuned to exhibit a low impedance at .omega..sub.2, at least some of said first set of LC elements having one of said second LC elements in parallel therewith.
摘要翻译： 用于多重调谐响应的鞍形线圈通过分段序列的第一LC元件实现，每个第一LC元件被调谐为在ω1处呈现低阻抗，第二组LC元件被调谐为在ω2处呈现低阻抗，至少部分 所述第一组LC元件具有与其平行的所述第二LC元件中的一个。
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公开(公告)号：US4721914A
公开(公告)日：1988-01-26
申请号：US605950
申请日：1984-05-01
IPC分类号： G01R33/38 , G01R33/3875 , H01F7/20 , G01R33/20
CPC分类号： G01R33/3808 , G01R33/3875 , H01F7/20
摘要： An apparatus for unilaterally producing a substantially homogeneous magnetic field. The apparatus includes two circular electromagnet coils, a small coil and a large coil, which are coaxial with one another and which are separated by a distance equal to one-half the difference in the radius of the two coils. By appropriate selection of electrical currents, which are passed through the coil in opposite directions, a region of homogeneous magnetic field is formed. This region is centered on the common axis of the two coils, at a point on the axis which is at a distance from the small coil equal to one-half the radius of the small coil, and which is on the opposite side of the small coil from the large coil. The apparatus has particular application in the field of diagnostic medical NMR and other NMR applications.
摘要翻译： 一种用于单方面产生基本上均匀的磁场的装置。 该装置包括两个圆形电磁体线圈，一个小线圈和一个大的线圈，它们彼此同轴并且被隔开距离等于两个线圈的半径的差的一半的距离。 通过适当地选择沿相反方向通过线圈的电流，形成均匀磁场的区域。 该区域以两个线圈的共轴为中心，在距离小线圈一定距离处的轴上的点等于小线圈的半径的一半，并且位于小线圈的相反侧 线圈从大线圈。 该装置在诊断医学NMR和其他NMR应用领域具有特别的应用。
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公开(公告)号：US5038105A
公开(公告)日：1991-08-06
申请号：US477687
申请日：1990-02-09
申请人： Robert S. Codrington , Alan R. Rath
发明人： Robert S. Codrington , Alan R. Rath
CPC分类号： G01R33/3635
摘要： A double-tuned circuit is realized from 1/2.lambda..sub.1 transmission lines for connecting a pair of inductors in series at a first frequency and in parallel for a second frequency where said first and second frequencies are in the ratio of a power of two.
摘要翻译： 双1/2调制电路由1/2λ1传输线实现，用于将第一和第二频率串联的一对电感器以第二频率串联连接，其中所述第一和第二频率的比值为二。
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公开(公告)号：US4916418A
公开(公告)日：1990-04-10
申请号：US331935
申请日：1989-03-31
申请人： Alan R. Rath
发明人： Alan R. Rath
CPC分类号： G01R33/3635
摘要： A multiply tuned bird cage results from the combination of low pass and high pass filter elements to yield a band reject network behaving as a low pass network at a low frequency and a high pass network at a high frequency. A band pass bird cage coil is obtained by adding a parallel LC combination to each leg of a bird cage coil to create additional poles in the impedance curve z(f).
摘要翻译： 多路调谐鸟笼由低通滤波器和高通滤波器元件的组合产生，以产生低频率的低通网络和高频网络的频带抑制网络。 通过向鸟笼线圈的每个腿添加平行LC组合以在阻抗曲线z（f）中产生额外的极点来获得带通鸟笼线圈。
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公开(公告)号：US4916398A
公开(公告)日：1990-04-10
申请号：US287789
申请日：1988-12-21
申请人： Alan R. Rath
发明人： Alan R. Rath
CPC分类号： G01R33/3628
摘要： The invention demonstrates remote tuning of an NMR probe over a length of transmission line while retaining very high efficiency relative to the equivalent locally turned coil. Fixed capacitances for partial tuning are employed at the load such that a desired range of efficiency is achievable for a selected range of capacitance values at both load and source for the intervening transmission line.
摘要翻译： 本发明示出了在传输线的长度上远程调谐NMR探针，同时保持相对于等效局部转向线圈的非常高的效率。 用于部分调谐的固定电容用于负载，使得对于针对中间传输线的负载和电源的电容值的选定范围，可以实现期望的效率范围。
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