公开(公告)号：US4825162A

公开(公告)日：1989-04-25

申请号：US130046

申请日：1987-12-07

申请人： Bernard Roemer ,  William A. Edelstein

发明人： Bernard Roemer ,  William A. Edelstein

IPC分类号： G01R33/3415 ,  G01R33/20

CPC分类号： G01R33/3415

摘要： A method for simultaneously receiving a different NMR response signal from each of a plurality of closely-spaced surface coils, first provides an array of a plurality of the surface coils, each positioned so as to have substantially no interaction with all adjacent surface coils. A different NMR response signal is received from an associated portion of the sample enclosed within an imaging volume defined by the array. Each different NMR response signal is used to construct a different one of a like plurality of NMR images of the sample, with the plurality of different images then being combined, on a point-by-point basis, to produce a single composite NMR image of a total sample portion from which NMR response signal contribution was received by any of the array of surface coils. Interactions between non-adjacent surface coils are minimized by coupling each onto an associated preamplifier.

摘要翻译： 同时从多个紧密间隔的表面线圈中的每一个接收不同的NMR响应信号的方法首先提供多个表面线圈的阵列，每个表面线圈定位成与所有相邻的表面线圈基本上没有相互作用。 从包含在由阵列定义的成像体积内的样品的相关部分接收不同的NMR响应信号。 每个不同的NMR响应信号用于构建样品的相同多个NMR图像中的不同的一个，然后在逐点的基础上组合多个不同的图像，以产生单个的NMR图像 通过表面线圈阵列中的任何阵列接收到NMR响应信号贡献的总样本部分。 通过将每个相邻的前置放大器相耦合，使非相邻表面线圈之间的相互作用最小化。

公开(公告)号：US5739936A

公开(公告)日：1998-04-14

申请号：US430052

申请日：1995-04-27

申请人： Christopher Paul Yakymyshyn ,  Peter Bernard Roemer ,  Ronald Dean Watkins

发明人： Christopher Paul Yakymyshyn ,  Peter Bernard Roemer ,  Ronald Dean Watkins

IPC分类号： H04B10/00 ,  H04B10/12

CPC分类号： H04B10/032

摘要： An electro optical circuit for transmitting an information bearing signal, such as a signal in the RF, AF or microwave frequency domains, to a predetermined location includes a laser for generating coherent light to be used as a carrier, and an electro optical modulator for receiving the information signal and the coherent light and generating first and second modulated light signals which respectively comprise the coherent light modulated by the information signal and the coherent light modulated by the inversion of the information signal. The first and second modulated light signals are supplied to a detector at the predetermined location through separate optical paths. The detector converts the first modulated light signal into a first DC component, representing the laser-generated coherent light, and into a first information component representing the information signal, and converts the second modulated light signal into a second DC component which also represents the laser-generated coherent light, and into a second information component representing the inversion of the information signal and which is thus in an anti-phase relationship with the first information component. The detector combines the first and second DC current components so that they mutually nullify each another.

摘要翻译： 用于将诸如RF，AF或微波频域中的信号的信息承载信号发送到预定位置的电光电路包括用于产生用作载波的相干光的激光器和用于接收的电光调制器 信号信号和相干光，并且产生第一和第二调制光信号，其分别包括由信息信号调制的相干光和由信息信号的反相调制的相干光。 第一和第二调制光信号通过分开的光路被提供给预定位置处的检测器。 检测器将第一调制光信号转换成表示激光产生的相干光的第一DC分量，并将其转换成表示信息信号的第一信息分量，并将第二调制光信号转换成也表示激光的第二DC分量 并产生代表信息信号的反转的第二信息分量，并因此与第一信息分量成反相关系。 检测器组合了第一和第二直流电流分量，使得它们彼此相互抵消。

公开(公告)号：US5680046A

公开(公告)日：1997-10-21

申请号：US286366

申请日：1994-08-05

申请人： Perry Scott Frederick ,  Walter Albert Zimmermann ,  Peter Bernard Roemer

发明人： Perry Scott Frederick ,  Walter Albert Zimmermann ,  Peter Bernard Roemer

IPC分类号： A61B5/055 ,  G01R33/422 ,  G01Y3/00

CPC分类号： G01R33/422

摘要： A magnetic resonance system includes a cylindrical shield disposed between a quadrature RF coil and surrounding gradient coils. The shield includes a pair of copper sheets separated by an insulating dielectric sheet. A pattern formed by cuts in one copper sheet aligns with the currents induced in the shield by one of the RF quadrature fields, and a pattern formed by cuts in the other copper shield aligns with the other RF quadrature field. The copper sheets are shorted together to prevent voltage breakdowns and short cuts are made in each to prevent gradient induced eddy currents.

摘要翻译： 磁共振系统包括设置在正交RF线圈和周围梯度线圈之间的圆柱形屏蔽。 屏蔽包括由绝缘介电片隔开的一对铜片。 由一个铜片中的切口形成的图案与通过RF正交场中的一个场合在屏蔽中感应的电流对准，并且由另一个铜屏蔽中的切口形成的图案与另一个RF正交场对准。 铜片短路在一起以防止电压击穿，并且在每个铜片上进行快速切割以防止梯度诱发的涡流。