公开(公告)号：US5757189A

公开(公告)日：1998-05-26

申请号：US757240

申请日：1996-11-27

申请人： David A. Molyneaux ,  William O. Braum ,  James W. Kristoff

发明人： David A. Molyneaux ,  William O. Braum ,  James W. Kristoff

IPC分类号： G01R33/48 ,  A61B5/055 ,  G01R33/341 ,  G01R33/3415 ,  G01V3/00

CPC分类号： G01R33/341 ,  G01R33/3415

摘要： A multimode radio frequency coil (50.sub.1) receives resonance signals from a region of interest while allowing arbitrary placement of the coil. A peripheral electrical conductor (62) is divided into four symmetric segments by capacitors (76), (78), (80), (82). A pair of crossing conductors (64, 66) are connected between 90.degree. offset diagonally opposite portions of the peripheral loop (62). The crossing conductors include capacitors (68, 70) when not connected and include capacitors (68, 70, 86, 88) when connected at their midpoints. With this configuration, the coil supports orthogonal modes (72, 74) within the plane of the coil and, additionally, a third orthogonal mode (84) perpendicular to the plane of the coil. To image an extended region, a plurality of coils are overlapped to minimize mutual inductance relative to a first mode. An adjustable capacitor (90) across one of the coils adjusts mutual inductance relative to the second mode. A pair of half wavelength conductors (94, 96) are connected diagonally across the coils and are interconnected by an adjustable capacitor (98) for adjusting the third mode.

摘要翻译： 多模射频线圈（501）从感兴趣的区域接收谐振信号，同时允许线圈的任意放置。 周边电导体（62）通过电容器（76），（78），（80），（82）分成四个对称段。 一对交叉导体（64,66）连接在外围环（62）的90°偏移对角线相对部分之间。 交叉导体包括当未连接时的电容器（68,70），并且当它们的中点连接时包括电容器（68,70,86,88）。 利用该配置，线圈支撑线圈平面内的正交模式（72,74），并且还支持垂直于线圈平面的第三正交模式（84）。 为了对延伸区域进行成像，重叠多个线圈以使相对于第一模式的互感最小化。 跨越一个线圈的可调节电容器（90）调节相对于第二模式的互感。 一对半波长导体（94,96）被对角地连接在线圈上，并通过可调电容器（98）互连，用于调节第三模式。

公开(公告)号：US6051974A

公开(公告)日：2000-04-18

申请号：US979053

申请日：1997-11-26

申请人： Theodore J. Reisker ,  David A. Molyneaux ,  John T. Carlon ,  Benjamin R. Stern ,  William O. Braum

发明人： Theodore J. Reisker ,  David A. Molyneaux ,  John T. Carlon ,  Benjamin R. Stern ,  William O. Braum

IPC分类号： A61B5/055 ,  G01R33/28 ,  H01F6/00 ,  H01F7/20 ,  G01V3/00

CPC分类号： G01R33/285

摘要： An endocavity RF coil assembly for an MRI apparatus includes a reusable probe (30). The reusable probe has a hollow outer cover (60) having a closed distal end and (62) an open proximate end (64). The distal end (62) is formed to fit into a cavity of a subject being examined. An active RF coil element (72) is rigidly formed about an internal sleeve (70) which is located within the distal end (62) of the outer cover (60). A tuning and matching circuit is disposed within the outer cover (60) on the proximate end (64) side of the active RF coil element (72). The tuning and matching circuit is arranged on a printed circuit board (74) and attached to the active RF coil element (72). An over-molded form (90) is connected to the proximate end (64) of the outer cover (60). The over-molded form (90) is arranged such that it seals the proximate end (64) of the outer cover (60) closed.

摘要翻译： 用于MRI装置的内腔RF线圈组件包括可重复使用的探针（30）。 可重复使用的探针具有中空的外盖（60），其具有封闭的远端和（62）敞开的近端（64）。 远端（62）形成为适合被检查对象的空腔。 主动RF线圈元件（72）围绕位于外盖（60）的远端（62）内部的内套筒（70）而刚性地形成。 调谐和匹配电路设置在有源RF线圈元件（72）的近端（64）侧上的外盖（60）内。 调谐和匹配电路布置在印刷电路板（74）上，并连接到有源RF线圈元件（72）。 外模（90）连接到外盖（60）的近端（64）。 整体模制形式（90）被布置成使得其封闭外盖（60）的近端（64）。

公开(公告)号：US5578925A

公开(公告)日：1996-11-26

申请号：US512274

申请日：1995-08-18

申请人： David A. Molyneaux ,  William O. Braum

发明人： David A. Molyneaux ,  William O. Braum

IPC分类号： G01R33/34 ,  A61B5/055 ,  G01R33/341 ,  G01R33/3415 ,  G01R33/38 ,  G01V3/00

CPC分类号： G01R33/3678 ,  G01R33/34046 ,  G01R33/3415 ,  G01R33/3806

摘要： A vertical B.sub.0 temporally constant magnetic field is defined between a pair of pole faces (12, 14) that are interconnected by a C-shaped ferrous magnetic flux path (16). A quadrature radio frequency coil array (50) is disposed in a plane orthogonal to the B.sub.0 field. The coil array includes a plurality of coils (50.sub.1, 50.sub.2, . . . ) that are disposed in a partially overlapping relationship. Each of the coils has a peripheral loop (60), preferably defined by four linear legs (60.sub.1, 60.sub.2, 60.sub.3, 60.sub.4) of equal length which define a square. A pair of crossing elements (62.sub.1, 62.sub.2) are connected with mid-points of opposite sides of the square, the opposite mid-points are 180.degree. out-of-phase with each other at the magnetic resonance frequency and 90.degree. out-of-phase with neighboring mid-points of the square. The crossing elements cross but are not connected, in a symmetric relationship. Each of the crossing elements has a radio frequency pick-up (64.sub.1, 64.sub.2) associated therewith. The two radio frequency pick-ups receive 90.degree. offset, quadrature radio frequency signals from resonating nuclei within the B.sub.0 field.

摘要翻译： 垂直B0时间常数磁场被限定在由C形铁磁通路（16）互连的一对极面（12,14）之间。 正交射频线圈阵列（50）设置在与B0场正交的平面中。 线圈阵列包括以部分重叠关系设置的多个线圈（501,502 ...）。 每个线圈具有外围环路（60），优选地由四个线性支线（601,602,603,604）限定平行的相等长度。 一对交叉元件（621,622）与正方形的相对侧的中点连接，相反的中点在磁共振频率处彼此相差180度，在90度以外 与广场的相邻中点相邻。 交叉元素交叉但不是以对称关系连接。 每个交叉元件具有与其相关联的射频拾取器（641,642）。 两个射频拾取器从B0场内的谐振核接收90°偏移，正交射频信号。

公开(公告)号：US5336988A

公开(公告)日：1994-08-09

申请号：US16042

申请日：1993-02-10

申请人： Thomas Chmielewski ,  David A. Molyneaux ,  William O. Braum

发明人： Thomas Chmielewski ,  David A. Molyneaux ,  William O. Braum

IPC分类号： G01R27/28 ,  G01R33/28 ,  G01R33/36 ,  G01R33/00

CPC分类号： G01R27/28 ,  G01R33/28 ,  G01R33/3628

摘要： An RF device (A) under test is connected with ports or jacks (14, 16) of an S-parameter test set (B). An RF input jack (18) is connected with an RF tracking signal output (20) of a spectrum analyzer (C) to receive an RF tracking signal. An output jack (22) is connected with a receiver input (24) of the spectrum analyzer. A mode control (30) internal to the test set is controlled by a programmable control sequence generator (34) of the spectrum analyzer. The mode control controls a switch array (32), preferably PIN diodes, which interconnect the RF input jack (18), the RF output jack (22), the two jacks (14, 16) that are connected to the device under test, and a 50 Ohm termination (54) in four modes to make reflection measurements and two transmission measurements. DC bias jacks (26, 28) are connected with a DC power for injecting a DC component into the RF signals applied to the device under test.

摘要翻译： 被测试的RF设备（A）与S参数测试仪（B）的端口或插座（14,16）连接。 RF输入插孔（18）与频谱分析仪（C）的RF跟踪信号输出（20）连接，以接收RF跟踪信号。 输出插孔（22）与频谱分析仪的接收器输入端（24）连接。 测试仪内部的模式控制（30）由频谱分析仪的可编程控制序列发生器（34）控制。 模式控制控制开关阵列（32），优选PIN二极管，其将RF输入插孔（18），RF输出插孔（22），连接到被测器件的两个插座（14,16） 和50欧姆终端（54），以进行反射测量和两次传输测量。 DC偏压千斤顶（26,28）与用于将DC分量注入施加到被测器件的RF信号的直流电源连接。

公开(公告)号：US5594339A

公开(公告)日：1997-01-14

申请号：US500821

申请日：1995-07-11

申请人： Robert G. Henderson ,  James W. Kristoff ,  David A. Molyneaux

发明人： Robert G. Henderson ,  James W. Kristoff ,  David A. Molyneaux

IPC分类号： A61B5/055 ,  G01R33/34 ,  G01R33/341 ,  H01F5/00 ,  G01V3/00

CPC分类号： G01R33/3415 ,  G01R33/34084 ,  G01R33/34007 ,  G01R33/341

摘要： A resonance exciting coil (C) disposed in an image region in which a main magnetic field and transverse gradients have been produced. A flexible receiving coil (D) includes a flexible plastic sheet (40) on which an electrically continuous flexible foil strip (36) is adhered to receive signals from the resonating nuclei. The coil also includes components (24), mounted on the flexible plastic sheet (40), which may amplify the received signals before they are transmitted along a cable (22). A first soft material layer (44) is mounted on the flexible plastic sheet (40) for providing comfort to the patient. A flexible mechanical structure (50) on which two flexible receiving coils (F, G) adjusts an overlap between the coils (F, G) as the coils are flexed to adjust interaction properties of the coils (FIGS. 4 A, 4B). Pivotal rods (56) of a fixed length which connect two flexible coils (F, G) cause the spacing of the coils to vary in accordance to a flex applied to the coils to adjust the relative interactive properties with flexing (FIGS. 5 A, 5B). Flexible coils (D) in modular components provide identification points on each modular component which connect to similar identification points on other flexible coil modular components (FIGS. 9 A-9C).

摘要翻译： 设置在已经产生主磁场和横向梯度的图像区域中的共振励磁线圈（C）。 柔性接收线圈（D）包括柔性塑料片（40），电连续的柔性箔条（36）粘附在柔性塑料片上以接收来自谐振核的信号。 线圈还包括安装在柔性塑料片（40）上的组件（24），其可以在沿着电缆（22）传输之前放大所接收的信号。 第一柔软材料层（44）安装在柔性塑料片（40）上，以便为患者提供舒适感。 柔性机械结构（50），其中两个柔性接收线圈（F，G）在线圈弯曲时调节线圈（F，G）之间的重叠，以调节线圈的相互作用特性（图4A，4B）。 连接两个柔性线圈（F，G）的固定长度的枢杆（56）使得线圈的间距根据施加到线圈的弯曲而变化，以通过弯曲来调整相对的相对性质（图5A， 5B）。 模块化组件中的柔性线圈（D）在每个模块化组件上提供连接到其他柔性线圈模块组件上的类似识别点的识别点（图9A-9C）。

公开(公告)号：US07696751B2

公开(公告)日：2010-04-13

申请号：US11635417

申请日：2006-12-07

申请人： David A. Molyneaux ,  Jeanette Ciesla ,  Dimitris Tsalikis

发明人： David A. Molyneaux ,  Jeanette Ciesla ,  Dimitris Tsalikis

IPC分类号： G01V3/00

CPC分类号： G01R33/288

摘要： A method and apparatus for ferrous object and/or magnetic field detection are provided. Embodiments can improve magnetic resonance imaging (MRI) safety and increase the safety of MRI facilities. Embodiments can detect a given magnetic field strength around a MRI machine and alert users to the field's presence. In an embodiment, the magnetic field warning system can rely on a single badge that warns its user. In another embodiment, the badge can utilize an RFID system. The RFID system can turn the badge on when it enters the MRI room and off when it leaves the MRI room. In another embodiment, a badge with a rechargeable battery and charger can be utilized with or without an RFID tag. The subject badges or other detection devices can be worn by a person, located on or near a ferrous object, embedded in clothing, or located in other positions convenient to a user.

摘要翻译： 提供了一种用于铁物体和/或磁场检测的方法和装置。 实施例可以改善磁共振成像（MRI）的安全性并增加MRI设备的安全性。 实施例可以检测MRI机器周围的给定磁场强度，并且向用户提醒现场的存在。 在一个实施例中，磁场警告系统可以依靠警告其用户的单个徽章。 在另一个实施例中，徽章可以利用RFID系统。 当RFID系统进入MRI室时，RFID系统可以打开徽章，当离开MRI室时，它将被关闭。 在另一个实施例中，具有可充电电池和充电器的徽章可以在有或没有RFID标签的情况下使用。 主体徽章或其他检测装置可以由位于或接近有色金属物体的人佩戴，嵌入衣服中，或位于便于使用者的其他位置。

公开(公告)号：US4918388A

公开(公告)日：1990-04-17

申请号：US234278

申请日：1988-08-19

申请人： Mehrdad Mehdizadeh ,  David A. Molyneaux ,  G. Neil Holland

发明人： Mehrdad Mehdizadeh ,  David A. Molyneaux ,  G. Neil Holland

IPC分类号： A61B5/055 ,  G01R33/32 ,  G01R33/34 ,  G01R33/341 ,  G01R33/36

CPC分类号： G01R33/3678 ,  G01R33/34046 ,  G01R33/341 ,  G01R33/3628 ,  G01R33/34007

摘要： A thin dielectric sheet (36) has a first or loop coil (30) defined on one surface thereof and a second or Helmholtz coil (32) defined on an obverse surface thereof. The dielectric sheet and associated coils may be laid flat (FIG. 3) or bent to match a selected curved surface of the subject (FIGS. 6-8). The first and second coils are arranged symmetrically about an axis or plane of symmetry (34). The first coil has an associated magnetic field along a y-axis and the second coil has an associated magnetic field along the x-axis. Circuits (40 and (42) tune the first and second magnetic resonance coils to a preselected magnetic resonance frequency. Magnetic resonance signals of the selected frequency received by one of the coils are phase shifted 90.degree. by a phase shifting circuit (50) and combined with the unphase shifted signals from the other coil by a combining circuit (52). The combined signals are amplified (54) and conveyed to electronic image processing circuitry (E) of a magnetic resonance scanner.

摘要翻译： 薄介电片（36）具有限定在其一个表面上的第一或环形线圈（30）和限定在其正面上的第二或亥姆霍兹线圈（32）。 电介质片和相关联的线圈可以平放（图3）或弯曲以匹配被摄体的选定曲面（图6-8）。 第一和第二线圈围绕对称轴（34）对称地布置。 第一线圈具有沿着y轴的相关磁场，而第二线圈具有沿x轴的相关磁场。 电路（40和（42）将第一和第二磁共振线圈调谐到预选的磁共振频率，由一个线圈接收的所选频率的磁共振信号由相移电路（50）相移90°并组合 通过组合电路（52）将来自另一个线圈的相位移动信号放大（54）并传送到磁共振扫描器的电子图像处理电路（E）。

公开(公告)号：US06894496B2

公开(公告)日：2005-05-17

申请号：US10607393

申请日：2003-06-25

申请人： David A. Molyneaux ,  G. Randy Duensing ,  S. Uli Gotshal ,  Thomas E. Schubert ,  Alan Holland ,  Scott B. King

发明人： David A. Molyneaux ,  G. Randy Duensing ,  S. Uli Gotshal ,  Thomas E. Schubert ,  Alan Holland ,  Scott B. King

IPC分类号： G01R33/34 ,  G01R33/3415 ,  G01B3/00 ,  G01R33/20 ,  G01R33/24

CPC分类号： G01R33/34046 ,  G01R33/34053 ,  G01R33/3415 ,  G01R33/365 ,  G01R33/3664

摘要： The subject invention pertains to a method and apparatus for Nuclear Magnetic Resonance (NMR) imaging. The subject method and apparatus are advantageous with respect to the use of RF coils for receiving signals in NMR scanners. The subject invention can utilize multiple coils to, for example, improve the signal to noise, increase the coverage area, and/or reduce the acquisition time. The use of multiple smaller surface or volume coils to receive NMR signals from the sample can increase the signal to noise ratio compared to a larger coil that has the same field of view and coverage area.

摘要翻译： 本发明涉及用于核磁共振（NMR）成像的方法和装置。 本发明的方法和装置在使用RF线圈用于在NMR扫描仪中接收信号方面是有利的。 本发明可以利用多个线圈来例如改善信噪比，增加覆盖区域和/或减少采集时间。 与具有相同视野和覆盖面积的较大线圈相比，使用多个更小的表面或体积线圈从样本接收NMR信号可以增加信噪比。

公开(公告)号：US5510711A

公开(公告)日：1996-04-23

申请号：US286758

申请日：1994-08-05

申请人： David A. Molyneaux ,  Haiying Liu

发明人： David A. Molyneaux ,  Haiying Liu

IPC分类号： G01R33/32 ,  A61B5/055 ,  G01R33/34 ,  G01R33/565 ,  G01R33/48

CPC分类号： G01R33/3678 ,  G01R33/5659

摘要： Magnetic resonance is excited in selected portions of a subject disposed within a temporally uniform magnetic field of a magnetic resonance imaging system. A quadrature coil assembly (30) receives radio frequency magnetic resonance signals from the subject. Commonly, the quadrature coil fails to receive signals in true quadrature over the entire examination region. Resonance signals from a first coil (32) and a second, orthogonal coil (34) are received (40, 42), digitized (44, 46), and Fourier transformed (50, 52) into complex images. Each complex image includes an array or grid of vector data values having a magnitude and a direction or phase angle. If the quadrature coil was truly quadrature over the entire region of interest, the data values of both complex images would be a unit vectors. The vector of one image would be offset by 90.degree. from the vectors of the other. A phase correction board (54) sets the phase angle of the corresponding data values of the first and second complex images to a common vector direction or phase angle. A magnitude correction board (56) adjusts the magnitude of each corresponding data value of the first and second complex images. The phase angle and magnitude corrected complex data images are summed (58) and the real or magnitude image is stored in an image memory (62).

摘要翻译： 在设置在磁共振成像系统的时间均匀磁场内的被摄体的选定部分激发磁共振。 正交线圈组件（30）从主体接收射频磁共振信号。 通常，正交线圈不能在整个检查区域接收真正正交信号。 来自第一线圈（32）和第二正交线圈（34）的共振信号被接收（40,42），数字化（44,46）和傅里叶变换（50,52）成复数图像。 每个复合图像包括具有幅度和方向或相位角的矢量数据值的阵列或网格。 如果正交线圈在感兴趣的整个区域上是真正的正交的，则两个复数图像的数据值将是单位向量。 一个图像的向量将从另一个图像的向量偏移90°。 相位校正板（54）将第一和第二复合图像的相应数据值的相位角设置为公共矢量方向或相位角。 幅度校正板（56）调整第一和第二复合图像的每个相应数据值的大小。 将相位角和幅度校正的复数数据图像求和（58），并将实际或幅度图像存储在图像存储器（62）中。

公开(公告)号：US5138260A

公开(公告)日：1992-08-11

申请号：US616890

申请日：1990-11-21

申请人： David A. Molyneaux ,  William McLemore

发明人： David A. Molyneaux ,  William McLemore

IPC分类号： A61B5/055 ,  G01R33/34 ,  G01R33/3415 ,  G01R33/48 ,  G01R33/54 ,  H01F7/20

CPC分类号： G01R33/3415 ,  G01R33/54

摘要： A whole body RF antenna (22) surrounds an examination region (14). A localized coil array (40) having a plurality of coils (42a, 43b, . . . ) is mounted in the examination region. A switch array (48) selectively connects a selected one of the coils with an output (46). In a pilot or alignment scan, an imaging sequence is conducted using the whole body antenna (22) to generate an image of a portion of the surface coil array and the patient in the examination region. The coil array includes a marker (82) that is readily identifiable in the resultant image displayed on a video monitor (36). The location of slices for more detailed imaging are selected by positioning a cursor (64) on the video display. The position or coordinate system of the selected slices is aligned with the position or coordinate system of the coil array by positioning the cursor over the image of the marker and noting its position. Properties or parameters of each coil of the array are stored in a look up table (74). The parameters of each selected slice and imaging sequence are compared (72) with the properties in the look up table in order to determine an optimal one or more of the coils (42) for use in each imaging sequence. An imaging sequence along each of the slices is conducted utilizing the corresponding selected coils.