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21. 发明授权

US06294972B1 Method for shimming a static magnetic field in a local MRI coil 失效
标题翻译：用于对局部MRI线圈中的静态磁场进行匀场的方法
公开(公告)号：US06294972B1
公开(公告)日：2001-09-25
申请号：US09716779
申请日：2000-11-20
申请人： Andrzej Jesmanowicz , James S. Hyde , William F. B. Punchard , Piotr M. Starewicz
发明人： Andrzej Jesmanowicz , James S. Hyde , William F. B. Punchard , Piotr M. Starewicz
IPC分类号： G01V300
CPC分类号： G01R33/3875 , G01R33/3873
摘要： A local head coil for an MRI system includes a passive shim assembly having ferroshims placed to reduce B0 field inhomogeneities caused by susceptibility effects in the subject being imaged. A prescan is performed with the subject in place to measure B0 field inhomogeneities and the passive shim assembly is tailored to the subject by attaching ferroshim inserts based on these measurements.
摘要翻译：用于MRI系统的局部头部线圈包括被放置的电子垫片的被动垫片组件，以减少由被成像的被摄体中的易感性影响引起的B0场不均匀性。执行预扫描以使受试者到位以测量B0场不均匀性，并且基于这些测量，通过附加ferroshim插入物来对受试者定制被动垫片组件。

22. 发明授权

US5372137A NMR local coil for brain imaging 失效
标题翻译： NMR局部线圈用于脑成像
公开(公告)号：US5372137A
公开(公告)日：1994-12-13
申请号：US6219
申请日：1993-01-19
申请人： Eric C. Wong , James S. Hyde
发明人： Eric C. Wong , James S. Hyde
IPC分类号： A61B5/055 , G01R33/34 , G01R33/48
CPC分类号： G01R33/385 , A61B5/0042 , A61B5/0555 , G01R33/34076 , G01R33/34007
摘要： A local RF and gradient coil for acquiring images of the human brain using fast NMR pulse sequences includes an end capped RF bird cage coil surrounded by a 3 axis gradient coil assembly. An RF shield is disposed between the RF coil and the gradient coils and it is divided into separate segments to reduce eddy currents induced by the changing gradient fields.
摘要翻译：使用快速NMR脉冲序列获取人脑图像的局部RF和梯度线圈包括由3轴梯度线圈组件围绕的端盖RF鸟笼线圈。 RF屏蔽设置在RF线圈和梯度线圈之间，并且被分成单独的段以减少由变化的梯度场引起的涡流。

23. 发明授权

US4725779A NMR local coil with improved decoupling 失效
标题翻译： NMR局部线圈具有改进的去耦
公开(公告)号：US4725779A
公开(公告)日：1988-02-16
申请号：US897165
申请日：1986-08-15
申请人： James S. Hyde , Wojciech Froncisz , Andrzej Jesmanowicz
发明人： James S. Hyde , Wojciech Froncisz , Andrzej Jesmanowicz
IPC分类号： G01N33/00 , G01R33/20
CPC分类号： G01R33/343 , G01R33/3657
摘要： A local coil for use in NMR imaging includes a pair of loop-gap resonators which are geometrically arranged to be intrinsically isolated. The local coil also includes passive decoupling means to completely decouple the local coil during excitation. In a first embodiment, the pair of loop-gap resonators are disposed axially and the passive decoupling means comprises a pair of back-to-back diodes across the loop-gap resonators. In a second embodiment, the pair of loop-gap resonators are disposed in a plane and the passive decoupling means comprises two single turn loops inside each loop-gap resonator with back-to-back diodes across an open segment of each single turn loop. During excitation, the diodes fire thereby lowering the Q and shifting the resonant frequency of the local coil. Using a combination of intrinsic isolation and passive decoupling, the local coil is completely decoupled from the excitation field. During periods of reception, the diodes revert to their nonconducting state and the intrinsic isolation continues to function providing some degree of noise immunity for the local coil.
摘要翻译：在NMR成像中使用的局部线圈包括几何布置为内在隔离的一对环形间隙谐振器。本地线圈还包括在激励期间完全去耦局部线圈的无源去耦装置。在第一实施例中，一对环形间隙谐振器被轴向布置，并且无源去耦装置包括跨越环形间隙谐振器的一对背对背二极管。在第二实施例中，一对环形间隙谐振器被设置在一个平面中，并且无源去耦装置在每个环形间隙谐振器内部包括两个单个匝环，其中背对背二极管跨越每个单匝环的开放段。在激励期间，二极管起火，从而降低Q并移动局部线圈的谐振频率。使用本征隔离和无源去耦的组合，局部线圈与激励场完全解耦。在接收期间，二极管恢复到其非导通状态，本征隔离继续工作，为本地线圈提供一定程度的抗噪声能力。

24. 发明授权

US4721913A NMR local coil network 失效
标题翻译： NMR局部线圈网络
公开(公告)号：US4721913A
公开(公告)日：1988-01-26
申请号：US897177
申请日：1986-08-15
申请人： James S. Hyde , Wojciech Froncisz , Andrzej Jesmanowicz , Thomas M. Grist
发明人： James S. Hyde , Wojciech Froncisz , Andrzej Jesmanowicz , Thomas M. Grist
IPC分类号： A61B5/055 , G01R33/32 , G01R33/343 , G01R33/36 , G01R33/20
CPC分类号： G01R33/343 , G01R33/34007 , G01R33/34061 , G01R33/3642 , G01R33/365 , G01R33/3657 , G01R33/3678
摘要： Counter Rotating Current (CRC) pairs of loop-gap resonators are combined with planar pairs of loop-gap resonators to form networks of NMR local coils. A first embodiment is a quadrature probe in which a planar pair is sandwiched between the loop-gap resonators of the CRC pair. In a plurality of other embodiments, CRC pairs, planar pairs, and other types of local coils are arranged adjacent to one another to form networks of NMR local coils with an enlarged net region of sensitivity.
摘要翻译：计数器旋转电流（CRC）对的环形间隙谐振器与平面对的环形间隙谐振器组合以形成NMR局部线圈的网络。第一实施例是正交探针，其中平面对夹在CRC对的环路间隙谐振器之间。在多个其他实施例中，CRC对，平面对和其他类型的局部线圈彼此相邻布置以形成具有增大的净敏感区域的NMR局部线圈的网络。

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