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。

公开(公告)号：US5474069A

公开(公告)日：1995-12-12

申请号：US319178

申请日：1994-10-06

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。

公开(公告)号：US4888554A

公开(公告)日：1989-12-19

申请号：US227288

申请日：1988-08-02

申请人： James S. Hyde ,  Jerzy Gajdzinski

发明人： James S. Hyde ,  Jerzy Gajdzinski

IPC分类号： G01R33/60

CPC分类号： G01R33/60

摘要： An electron paramagnetic resonance (EPR) spectrometer employing a reference arm microwave bridge provides efficient, simultaneous generation of orthogonal I and Q signals. The simultaneous generation is enabled through the use of a field effect transistor (FET) microwave amplifier in the signal arm feeding a balanced quadrature mixer. The I and Q signals are then combined to produce a signal suitable for use as a discriminator in an automatic frequency control (AFC) circuit. An important characteristic of the discriminator signal is that it is independent of the relative phase angle .alpha. between the reference arm and signal arm of the bridge. In a further embodiment, an apparatus is disclosed which computes .alpha. from the I and Q signals, and uses the computed value for .alpha. to extract pure absorption and pure dispersion information from the I and Q signals regardless of the setting of .alpha. in the bridge.

摘要翻译： 使用参考臂微波桥的电子顺磁共振（EPR）光谱仪提供了正交I和Q信号的有效同时产生。 通过在馈送平衡正交混频器的信号臂中使用场效应晶体管（FET）微波放大器来实现同时发生。 然后将I和Q信号组合以产生适合用作自动频率控制（AFC）电路中的鉴频器的信号。 鉴别器信号的一个重要特征是它独立于参考臂与桥臂的信号臂之间的相对相位角α。 在另一个实施例中，公开了一种从I和Q信号计算α的装置，并且使用所计算的α值从I和Q信号中提取纯吸收和纯色散信息，而不管桥中的α的设置如何。

公开(公告)号：US08674694B2

公开(公告)日：2014-03-18

申请号：US12868244

申请日：2010-08-25

申请人： James S. Hyde ,  Jason W. Sidabras ,  Richard R. Mett

发明人： James S. Hyde ,  Jason W. Sidabras ,  Richard R. Mett

IPC分类号： H01J49/00

CPC分类号： G01T1/02 ,  G01N24/10 ,  G01R33/3806 ,  G01R33/60

摘要： An apparatus and method for triaging patients according to radiation exposure operates by measuring electron paramagnetic resonance spectra of fingernails, toenails, and/or teeth. A coil structure allows in vivo measurement of tooth enamel or fingernail keratin with reduced coupling to underlying tissue.

摘要翻译： 根据辐射暴露对患者进行分类的装置和方法通过测量指甲，脚趾甲和/或牙齿的电子顺磁共振谱来进行。 线圈结构允许体内测量牙釉质或指甲角蛋白，减少与下面组织的结合。