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公开(公告)号：US4724389A
公开(公告)日：1988-02-09
申请号：US731923
申请日：1985-05-08
CPC分类号： G01R33/343
摘要： A local probe for use in nuclear magnetic resonance imaging includes a pair of loop-gap resonators which are connected together and positioned adjacent a region of interest. FID signals produced in the region of interest induce signals in coupling loops mounted near each loop-gap resonator, and these connect to a transmission line leading to the receiver. Three embodiments are disclosed, one best suited for imaging appendages, a second best suited for imaging the head and neck, and a third best suited for the spine.
摘要翻译： 用于核磁共振成像的本地探针包括一对连接在一起并位于感兴趣区域附近的环形间隙谐振器。 在感兴趣区域中产生的FID信号在安装在每个环形间隙谐振器附近的耦合回路中引起信号，并且这些信号连接到通向接收器的传输线。 公开了三个实施例，一个最适合于成像附件，第二个最适合于头部和颈部成像，以及最适合于脊柱的第三实施例。
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公开(公告)号：US4725779A
公开(公告)日：1988-02-16
申请号：US897165
申请日：1986-08-15
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。
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公开(公告)号：US4721913A
公开(公告)日：1988-01-26
申请号：US897177
申请日：1986-08-15
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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公开(公告)号：US4866387A
公开(公告)日：1989-09-12
申请号：US148257
申请日：1988-01-25
IPC分类号： G01R33/343 , G01R33/36
CPC分类号： G01R33/365 , G01R33/343 , G01R33/36 , G01R33/34007 , G01R33/34061 , 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. In a further embodiment of the invention, an excitation coil operated in an excite/receive mode is combined with intrinsically isolated local detectors to form an NMR detection network.
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。 在本发明的另一实施例中，以激发/接收模式操作的激励线圈与本征隔离的局部检测器组合以形成NMR检测网络。
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公开(公告)号：US4446429A
公开(公告)日：1984-05-01
申请号：US310231
申请日：1981-10-09
申请人： Wojciech Froncisz , James S. Hyde
发明人： Wojciech Froncisz , James S. Hyde
IPC分类号： H01P7/00 , G01R33/34 , G01R33/343 , G01R33/345 , H01P7/04 , G01R33/08
CPC分类号： G01R33/345 , G01R33/343 , H01P7/04
摘要： A microwave resonator is formed by a cylindrical conductive loop and one or more gaps which extend along its length. The loop forms an inductive element and the gaps form capacitive elements which determine the resonant frequency. The loop is surrounded by a conductive shield which improves the quality factor (Q) of the resonator and high frequency radio signals are coupled to the resonator by an inductive loop positioned at one of its ends.
摘要翻译： 微波谐振器由圆柱形导电回路和沿其长度延伸的一个或多个间隙形成。 环路形成电感元件，间隙形成确定谐振频率的电容元件。 该环路被导电屏蔽围绕，该导电屏蔽层改善了谐振器的质量因子（Q），高频无线电信号通过位于其一端的感应回路耦合到谐振器。
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公开(公告)号：US4623835A
公开(公告)日：1986-11-18
申请号：US589641
申请日：1984-03-14
CPC分类号： G01B15/02 , G01N27/223
摘要： The thickness of a web is measured by passing the web through the gaps of a loop-gap resonator. Changes in web thickness alter the resonant frequency of the resonator which is detected by a control circuit. Three embodiments of the invention are described, and in one embodiment, the moisture content of the web is also measured.
摘要翻译： 通过将纤维网通过环形间隙共振器的间隙来测量幅材的厚度。 卷材厚度的变化改变了由控制电路检测到的谐振器的谐振频率。 描述了本发明的三个实施方案，并且在一个实施方案中，也测量了幅材的水分含量。
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公开(公告)号：US4593248A
公开(公告)日：1986-06-03
申请号：US593900
申请日：1984-03-27
申请人： James S. Hyde , Wojciech Froncisz , Ching-San Lai
发明人： James S. Hyde , Wojciech Froncisz , Ching-San Lai
IPC分类号： G01R33/465 , G01R33/60 , G01R33/20
CPC分类号： G01R33/465 , G01R33/60
摘要： An ESR spectrometer is employed to measure the oxygen concentration in a sample material. Electron paramagnetic resonance is produced in a free radical mixed with a standard material of known oxygen concentration. The phase of the signal produced by this resonance is compared with the phase of the signal produced by the electron paramagnetic resonance of the free radical mixed with the sample material. The oxygen concentration in the sample material has a single valued functional relationship with respect to this phase difference and is calculated in a microprocessor-based control system. At low oxygen concentrations, the relationship is a linear one.
摘要翻译： 使用ESR光谱仪来测量样品材料中的氧浓度。 在与已知氧浓度的标准材料混合的自由基中产生电子顺磁共振。 将由该共振产生的信号的相位与由与样品材料混合的自由基的电子顺磁共振产生的信号的相位进行比较。 样品材料中的氧浓度相对于该相位差具有单值函数关系，并且在基于微处理器的控制系统中计算。 在低氧浓度下，这种关系是一个线性关系。
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公开(公告)号：US4480239A
公开(公告)日：1984-10-30
申请号：US464473
申请日：1983-02-07
申请人： James S. Hyde , Wojciech Froncisz
发明人： James S. Hyde , Wojciech Froncisz
IPC分类号： G01R33/343 , G01R33/345 , H01P1/208 , H01P7/06 , G01R33/08
CPC分类号： G01R33/343 , G01R33/345 , H01P1/208
摘要： A lumped circuit loop-gap resonator is formed by a plurality of openings formed through a block of material. The openings form inductive loop elements and these are interconnected in a variety of possible networks by capacitive gap elements. String, star, ring and lattice networks are described.
摘要翻译： 集成电路环路间隙谐振器由通过一块材料形成的多个开口形成。 这些开口形成感应环路元件，并且它们通过电容间隙元件在各种可能的网络中互连。 描述了字符串，星形，环形和格子网络。
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9.发明授权Cavity resonator for electron paramagnetic resonance spectroscopy having axially uniform field 有权用于具有轴向均匀场的电子顺磁共振光谱的腔谐振器公开(公告)号：US06828789B2
公开(公告)日：2004-12-07
申请号：US10200885
申请日：2002-07-23
IPC分类号： G01V300
摘要： A uniform-field resonator includes a central cavity section having a cross-section which is set to the cutoff frequency for a particular microwave propagation mode and a pair of end sections which enclose the cavity to form a resonator in which the field is substantially uniform along the entire length of the central cavity—regardless of its length. A number of end section design strategies and resulting structures are described for supporting the uniform-field mode of operation in the central cavity section.
摘要翻译： 均匀场谐振器包括中心空腔部分，其具有被设置为特定微波传播模式的截止频率的截面，以及包围空腔以形成谐振器的一对端部，其中场基本均匀 中心腔的整个长度 - 不管其长度。 描述了许多端部设计策略和结果，以支持中心腔部分中的均匀场操作模式。
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公开(公告)号：US4504788A
公开(公告)日：1985-03-12
申请号：US414642
申请日：1982-09-03
申请人： Wojciech Froncisz , James S. Hyde
发明人： Wojciech Froncisz , James S. Hyde
IPC分类号： G01R33/343 , G01R33/345 , H01P7/06 , G01R33/08 , H03H1/00
CPC分类号： G01R33/345 , G01R33/343 , H01P7/06
摘要： The ends of a loop-gap resonator are extended along a closed path to define an enclosed chamber with a gap extending along its length. A lumped circuit resonator is formed and the magnetic field is confined to the chamber. Openings may be formed in the chamber wall to direct magnetic flux through sample materials outside the chamber, and the cross sectional area of the chamber may be altered to control the energy density distribution of the magnetic field.
摘要翻译： 环形间隙谐振器的端部沿封闭路径延伸以限定具有沿其长度延伸的间隙的封闭腔室。 形成集总电路谐振器，并将磁场限制在室内。 可以在室壁中形成开口以引导通过室外的样品材料的磁通量，并且可以改变室的横截面积以控制磁场的能量密度分布。
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