公开(公告)号：US20120286779A1

公开(公告)日：2012-11-15

申请号：US13104721

申请日：2011-05-10

申请人： DAVID O. WALSH ,  ELLIOT D. GRUNEWALD

发明人： DAVID O. WALSH ,  ELLIOT D. GRUNEWALD

IPC分类号： G01R33/44

CPC分类号： G01R33/44 ,  G01N24/081 ,  G01R33/4608

摘要： Technologies applicable to SNMR pulse sequence phase cycling are disclosed, including SNMR acquisition apparatus and methods, SNMR processing apparatus and methods, and combinations thereof. SNMR acquisition may include transmitting two or more SNMR pulse sequences and applying a phase shift to a pulse in at least one of the pulse sequences, according to any of a variety of phase cycling techniques. SNMR processing may include combining SNMR from a plurality of pulse sequences comprising pulses of different phases, so that desired signals are preserved and undesired signals are canceled.

摘要翻译： 公开了适用于SNMR脉冲序列相位循环的技术，包括SNMR采集装置和方法，SNMR处理装置和方法及其组合。 根据各种相位循环技术中的任何一种，SNMR获取可以包括传送两个或更多个SNMR脉冲序列并将相移施加到至少一个脉冲序列中的脉冲。 SNMR处理可以包括从包括不同相位的脉冲的多个脉冲序列组合SNMR，使得保留期望的信号并消除不期望的信号。

公开(公告)号：US20110210731A1

公开(公告)日：2011-09-01

申请号：US13090436

申请日：2011-04-20

申请人： DAVID O. WALSH

发明人： DAVID O. WALSH

IPC分类号： G01R33/44

CPC分类号： A61B5/055 ,  A61B5/7203 ,  G01R33/3415 ,  G01R33/36 ,  G01R33/365 ,  G01R33/3657 ,  G01R33/445

摘要： A multicoil NMR detection and imaging apparatus allows multicoil NMR detection and imaging to be performed efficiently at low operating frequencies. The apparatus comprises an AC voltage generator, a transmit switching circuit, a coil switching network, an array of two or more detection coils, a set of receive switching circuits with one switching circuit for each detection coil, and a set of preamplifier circuits with input impedance substantially greater than the impedance of each respective detection coil at the intended operating frequency. The AC generator produces an alternating current waveform that is routed through one of more detection coils during transmit mode while the preamplifier circuits are isolated from the detection coil(s). During receive mode the AC generator is isolated from the detection coils to prevent noise from the transmitter from degrading the quality of received signals.

公开(公告)号：US07986143B2

公开(公告)日：2011-07-26

申请号：US12672503

申请日：2008-11-10

申请人： David O. Walsh

发明人： David O. Walsh

IPC分类号： G01V3/00

CPC分类号： A61B5/055 ,  A61B5/7203 ,  G01R33/3415 ,  G01R33/36 ,  G01R33/365 ,  G01R33/3657 ,  G01R33/445

摘要： A multicoil NMR detection and imaging apparatus allows multicoil NMR detection and imaging to be performed efficiently at low operating frequencies. The apparatus comprises an AC voltage generator, a transmit switching circuit, a coil switching network, an array of two or more detection coils, a set of receive switching circuits with one switching circuit for each detection coil, and a set of preamplifier circuits with input impedance substantially greater than the impedance of each respective detection coil at the intended operating frequency. The AC generator produces an alternating current waveform that is routed through one of more detection coils during transmit mode while the preamplifier circuits are isolated from the detection coil(s). During receive mode the AC generator is isolated from the detection coils to prevent noise from the transmitter from degrading the quality of received signals.

摘要翻译： 多核磁共振检测和成像装置允许在低工作频率下有效地执行多核磁共振检测和成像。 该装置包括交流电压发生器，发射开关电路，线圈开关网络，两个或更多个检测线圈的阵列，一组具有用于每个检测线圈的一个开关电路的接收开关电路，以及一组具有输入的前置放大器电路 阻抗基本上大于每个相应检测线圈在预期工作频率下的阻抗。 交流发电机产生交流电流波形，其在发射模式期间通过一个或多个检测线圈路由，同时前置放大器电路与检测线圈隔离。 在接收模式期间，交流发电机与检测线圈隔离，以防止发射机的噪声降低接收信号的质量。