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41. 发明授权

US4740751A Whole body MRI resonator 失效
标题翻译：全身MRI共振器
公开(公告)号：US4740751A
公开(公告)日：1988-04-26
申请号：US894313
申请日：1986-08-07
申请人： George J. Misic , John L. Patrick
发明人： George J. Misic , John L. Patrick
IPC分类号： A61B5/055 , G01R33/32 , G01R33/34 , G01R33/343 , G01R33/36 , G01R33/20
CPC分类号： G01R33/34069 , G01R33/343 , G01R33/3628 , G01R33/34007 , G01R33/341
摘要： A resonator coil assembly (32) includes a dielectric sleeve (40) on which a first resonator coil portion (42) and a second resonator coil portion (44), each of copper foil, are adhered. The dielectric sleeve is dimensioned to receive a human torso therein and in one embodiment (FIG. 1) is circular in cross section and in another (FIG. 4) is elliptical in cross section. A pair of adjustable tuning capacitances (64, 66) and a pair of adjustable matching capacitances (68, 70) are interconnected between one end of the each coil portion and a metal bore liner (54). An opposite end of the coil portions are capacitively coupled to each other (FIG. 1) or to the bore liner (FIG. 3). A half wave length cable (72) interconnects the junctions between the first and second tuning and matching capacitances. One of these junctions is connected by a cable (74) with a radio frequency generator (30) and a radio receiver (34).
摘要翻译：谐振器线圈组件（32）包括电介质套筒（40），其上粘附有每个铜箔的第一谐振器线圈部分（42）和第二谐振器线圈部分（44）。电介质套筒的尺寸被设计成在其中容纳人体躯干，在一个实施例中（图1）的横截面是圆形的，而另一个（图4）的横截面是椭圆形的。一对可调节调谐电容（64,66）和一对可调整的匹配电容（68,70）在每个线圈部分的一端和金属内衬（54）之间互连。线圈部分的相对端部彼此电容耦合（图1）或孔径衬套（图3）。半波长电缆（72）互连第一和第二调谐和匹配电容之间的结。这些连接点中的一个通过具有射频发生器（30）的电缆（74）和无线电接收器（34）连接。

42. 发明授权

US4684895A Interface system for NMR spectrometer and quadrature probe 失效
标题翻译： NMR光谱仪和正交探头的界面系统
公开(公告)号：US4684895A
公开(公告)日：1987-08-04
申请号：US762306
申请日：1985-08-05
申请人： George J. Misic
发明人： George J. Misic
IPC分类号： A61B5/055 , A61B10/00 , G01R33/341 , G01R33/36 , G01R33/20
CPC分类号： G01R33/3678 , G01R33/3621 , G01R33/3614
摘要： In a magnetic resonance imager or other spectrometer, an interface (D) selectively connects quadrature probe coils (E) with a transmitter (C) and with a receiver (F). The interface includes a first RF switch (10), such as a first PIN diode (12) which has a low radio frequency impedance state for passing transmitted radio frequency signals to the probe coils and a high radio frequency impedance state for blocking the passage of radio frequency signals to the probe coils. A quarter wave length cable (20) or the equivalent is connected between the probe coils to shift the phase of the radio frequency signals 90 degrees. A second radio frequency switch (40) includes a second quarter wave length cable (42) and a second pin diode (44) which selectively pass and block radio frequency signals from passing between the probe coils and the receiver. A third pin diode (52) selectively connects a third quarter wave length cable (54) with ground to provide a band pass filter in the transmit mode and causes the third quarter wave length cable to be connected to ground through a fourth quarter wave length cable (60) in the receive mode to provide a band stop filter. A control (G) selectively biases the PIN diodes between their conductive and non-conductive states to establish the transmit and receive modes.
摘要翻译：在磁共振成像仪或其他光谱仪中，接口（D）选择性地将正交探针线圈（E）与发射器（C）和接收器（F）连接。该接口包括第一RF开关（10），例如第一PIN二极管（12），其具有用于将发射的射频信号传递到探针线圈的低射频阻抗状态，以及高的射频阻抗状态以阻止射频信号到探头线圈。四分之一波长电缆（20）或等效物连接在探针线圈之间，将射频信号的相位90度相移。第二射频开关（40）包括第二四分之一波长电缆（42）和第二pin二极管（44），其选择性地传递和阻止射频信号在探针线圈和接收器之间通过。第三pin二极管（52）选择性地将第三四分之一波长电缆（54）与地连接，以在发射模式下提供带通滤波器，并且使第三四分之一波长电缆通过第四四分之一波长电缆（60）处于接收模式以提供带阻滤波器。控制器（G）选择性地偏置PIN二极管在它们的导通状态和非导通状态之间以建立发射和接收模式。

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