公开(公告)号：US4794338A

公开(公告)日：1988-12-27

申请号：US125659

申请日：1987-11-25

申请人： Peter B. Roemer ,  Kenneth M. Bradshaw

发明人： Peter B. Roemer ,  Kenneth M. Bradshaw

IPC分类号： G01R33/20 ,  A61B5/05 ,  G01R33/38 ,  G01R33/421 ,  H01F7/20

CPC分类号： G01R33/4215

摘要： Self-shielded gradient coils are used to eliminate interactions between gradient coils and external structure. Interactions between gradient coils for different gradient axes are controlled by means of a balanced interconnection within each separate gradient coil set. One or both of the inner and outer coils within a gradient coil set are split such that for any localized capacitive current flow between coil sets there will be an equal and opposite current flow somewhere else between the coil sets.

公开(公告)号：US4638252A

公开(公告)日：1987-01-20

申请号：US684553

申请日：1984-12-21

申请人： Kenneth M. Bradshaw

发明人： Kenneth M. Bradshaw

IPC分类号： G01R33/28 ,  A61B5/05

CPC分类号： G01R33/34046 ,  G01R33/28 ,  Y10S505/844

摘要： A circuit for detecting the position of a radio frequency (RF) coil assembly in a magnetic resonance (MR) scanner includes, in the preferred embodiment, a normally closed switch connected to ground in parallel with a PIN diode which forms part of a transmit/receive (T/R) switch used to selectively couple the RF coil assembly to an RF power amplifier and an RF receiver preamplifier. The switch is operable by an actuating rod mounted to the RF coil assembly structure, whose position is to be sensed, such that when the assembly is in place the switch contacts are closed, and open when the assembly is not in place. The opening and closing of the switch shunts the PIN diode in and out, respectively, of the T/R switch circuit, thereby changing the voltage drop across other PIN diodes in the circuit. This change is sensed by a comparator circuit, the output of which is indicative of the RF coil assembly position.

摘要翻译： 在优选实施例中，用于检测射频（RF）线圈组件在磁共振（MR）扫描仪中的位置的电路​​包括：一个常闭开关，其与PIN二极管并联连接，该PIN二极管构成发射/ 接收（T / R）开关，用于选择性地将RF线圈组件耦合到RF功率放大器和RF接收机前置放大器。 开关可通过安装到RF线圈组件结构的致动杆来操作，该致动杆的位置将被检测，使得当组件就位时，开关触点闭合，并且当组件不在位时打开。 开关的开闭分别将PIN二极管分别导入到T / R开关电路中，从而改变电路中其他PIN二极管的电压降。 该变化由比较器电路感测到，其输出指示RF线圈组装位置。

公开(公告)号：US20080180101A1

公开(公告)日：2008-07-31

申请号：US11943229

申请日：2007-11-20

申请人： Kenneth M. Bradshaw ,  Michael S. Jones ,  Joshua J. Holwell ,  Scott M. Schillak ,  Matthew T. Waks ,  Mark A. Watson ,  Brandon J. Tramm ,  Labros L. Petropoulos

发明人： Kenneth M. Bradshaw ,  Michael S. Jones ,  Joshua J. Holwell ,  Scott M. Schillak ,  Matthew T. Waks ,  Mark A. Watson ,  Brandon J. Tramm ,  Labros L. Petropoulos

IPC分类号： G01R33/34

CPC分类号： G01R33/34046 ,  G01R33/34007 ,  G01R33/34084 ,  G01R33/3415 ,  G01R33/345 ,  G01R33/3453 ,  G01R33/3642 ,  G01R33/365 ,  G01R33/422 ,  G01R33/5659

摘要： This document discusses, among other things, a system and method for a coil having a plurality of resonant elements capable of radiofrequency transmission, reception, or both transmission and reception. One example includes a receive-only coil disposed within a transmit-only coil. Adjacent resonant elements are decoupled from one another by both capacitive elements and by the geometric configuration of the elements. Cables are coupled to each resonant element and are gathered at a junction in a particular manner.

摘要翻译： 本文件尤其涉及具有能够进行射频发送，接收或发送和接收的多个谐振元件的线圈的系统和方法。 一个示例包括设置在仅发射线圈内的仅接收线圈。 相邻的谐振元件通过电容元件和元件的几何构型彼此分离。 电缆耦合到每个谐振元件并以特定的方式聚集在结点处。

公开(公告)号：US20080174314A1

公开(公告)日：2008-07-24

申请号：US11943238

申请日：2007-11-20

申请人： Joshua J. Holwell ,  Scott M. Schillak ,  Kenneth M. Bradshaw ,  Brandon J. Tramm ,  Labros L. Petropoulos

发明人： Joshua J. Holwell ,  Scott M. Schillak ,  Kenneth M. Bradshaw ,  Brandon J. Tramm ,  Labros L. Petropoulos

IPC分类号： G01R33/34 ,  G01R33/48

CPC分类号： G01R33/3415 ,  G01R33/34046

摘要： This document discusses, among other things, a system and method for a coil having a plurality of resonant elements capable of radiofrequency transmission, reception, or both transmission and reception. One example includes a multi-channel receive-only coil comprised of overlapping planar loops. Adjacent resonant elements are decoupled from one another by both capacitive elements and by the geometric configuration of the elements. Cables are coupled to each resonant element and are gathered at a junction in a particular manner.

摘要翻译： 本文件尤其涉及具有能够进行射频发送，接收或发送和接收的多个谐振元件的线圈的系统和方法。 一个示例包括由重叠的平面回路组成的多通道接收 - 仅线圈。 相邻的谐振元件通过电容元件和元件的几何构型彼此分离。 电缆耦合到每个谐振元件并以特定的方式聚集在结点处。

公开(公告)号：US20080024133A1

公开(公告)日：2008-01-31

申请号：US11563047

申请日：2006-11-24

申请人： John Thomas Vaughan ,  Mark A. Watson ,  Kenneth M. Bradshaw ,  Matthew T. Waks ,  Joshua J. Holwell

发明人： John Thomas Vaughan ,  Mark A. Watson ,  Kenneth M. Bradshaw ,  Matthew T. Waks ,  Joshua J. Holwell

IPC分类号： G01R33/34 ,  A61B5/05

CPC分类号： G01R33/34046 ,  G01R33/3453 ,  G01R33/3678

摘要： An magnetic resonance apparatus in embodiments of the invention may include one or more of the following features: (a) a coil having at least two sections, (b) the at least two sections having a resonant circuit, (c) the at least two sections being reactively coupled or decoupled, (d) the at least two sections being separable, (e) the coil having openings allowing a subject to see or hear and to be accessed through the coil, (f) a cushioned head restraint, and (g) a subject input/output device providing visual data to the subject, the input/output device being selected from the group consisting of mirrors, prisms, video monitors, LCD devices, and optical motion trackers.

摘要翻译： 在本发明的实施例中的磁共振装置可以包括以下特征中的一个或多个：（a）具有至少两个部分的线圈，（b）所述至少两个部分具有谐振电路，（c）所述至少两个部分 （d）所述至少两个部分是可分离的，（e）所述线圈具有允许受试者看到或听到并且通过线圈进入的开口，（f）缓冲的头枕，和 g）被摄体输入/输出装置，向对象提供视觉数据，输入/输出装置从由镜子，棱镜，视频监视器，LCD装置和光学运动跟踪器组成的组中选择。

公开(公告)号：US4680545A

公开(公告)日：1987-07-14

申请号：US688677

申请日：1985-01-04

申请人： Floyd L. Gray ,  Thomas F. Schubert ,  Kenneth M. Bradshaw ,  Joshua O. Kolawole

发明人： Floyd L. Gray ,  Thomas F. Schubert ,  Kenneth M. Bradshaw ,  Joshua O. Kolawole

IPC分类号： G01R33/385 ,  G01R33/20

CPC分类号： G01R33/385 ,  G01R33/3854

摘要： A method is provided for reducing acoustical noise generated when gradient coils which are part of a nuclear magnetic resonance (MR) scanner are energized by current pulses in the course of an MR study. The acoustical noise is due to vibrations of a fiber-glass coil form on which the coils are wound. The vibrations are excited by high frequency components in the squared-edged conventional current pulses. Significant noise reduction is achieved by shaping the leading and trailing current pulse edges to eliminate the objectionable high frequency components. Advantageously, the pulse edges can be shaped using sinusoidal and Bessel function waveforms. Another useful waveform for pulse shaping is a ramp function with rounded transition points.

摘要翻译： 提供了一种用于在MR研究过程中通过电流脉冲激励作为核磁共振（MR）扫描器的一部分的梯度线圈时产生的声音噪声的方法。 声音噪声是由于缠绕线圈的玻璃纤维线圈形式的振动引起的。 振动由平方边的常规电流脉冲中的高频分量激发。 通过对前导和后沿电流脉冲边沿进行整形以消除令人反感的高频分量，可以实现显着的降噪。 有利地，可以使用正弦和贝塞尔函数波形来形成脉冲边缘。 脉冲整形的另一个有用波形是具有圆形转换点的斜坡函数。