公开(公告)号：US5153517A

公开(公告)日：1992-10-06

申请号：US626442

申请日：1990-12-12

申请人： Ralph Oppelt ,  Wilhelm Duerr ,  Horst Siebold

发明人： Ralph Oppelt ,  Wilhelm Duerr ,  Horst Siebold

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

CPC分类号： G01R33/3678 ,  G01R33/341

摘要： A surface resonator for use in a magnetic resonance imaging apparatus having a transversal fundamental magnetic field is composed of two sub-systems, each generating a magnetic field with the magnetic fields being perpendicular relative to each other. Each sub-system contains two current loops, both of which enclose the magnetic field allocated to them in the same plane. A circularly polarizing surface resonator is thus obtained for the transversal fundamental magnetic field.

摘要翻译： 用于具有横向基本磁场的磁共振成像装置的表面谐振器由两个子系统组成，每个子系统产生磁场，磁场相对于彼此垂直。 每个子系统包含两个电流回路，两个电流环都包含在同一平面上分配给它们的磁场。 因此获得了用于横向基本磁场的圆偏振面谐振器。

公开(公告)号：US5144239A

公开(公告)日：1992-09-01

申请号：US565137

申请日：1990-08-10

申请人： Ralph Oppelt ,  Horst Siebold

发明人： Ralph Oppelt ,  Horst Siebold

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

CPC分类号： G01R33/3678 ,  G01R33/34076 ,  G01R33/34007

摘要： A circularly polarizing RF antenna suitable for use in a magnetiic resonance imaging tomography apparatus has four current loops, each formed by two U-shaped conductors with the ends of the lateral legs of the U-shaped conductors disposed opposite to each other in mirror-symmetric fashion, and the ends of the lateral legs being bridged by a resonant capacitor. The current loops are arranged on a carrier which forms a portion of a hollow cylinder, and which is divided in an axial direction between two of the current loops, so that at least one of the current loops is removable without electrical contacts. A divisible RF antenna is thus achieved into which a head or a knee joint can be easily introduced for imaging.

摘要翻译： 适用于磁共振成像断层摄影装置的圆偏振RF天线具有四个电流回路，每个由两个U形导体形成，其U形导体的侧支腿的端部彼此相对设置成镜像对称 时尚，并且侧腿的端部被谐振电容器桥接。 电流回路布置在形成中空圆柱体的一部分并且在两个电流回路之间沿轴向方向分开的载体上，使得至少一个电流回路可移除而没有电接触。 因此可以实现可分割的RF天线，其中可以容易地引入头部或膝关节以用于成像。

公开(公告)号：US5055792A

公开(公告)日：1991-10-08

申请号：US462469

申请日：1990-01-09

申请人： Hanan Keren

发明人： Hanan Keren

IPC分类号： G01R33/341 ,  G01R33/36

CPC分类号： G01R33/341 ,  G01R33/3628

摘要： A miniaturized surface probe for use with magnetic resonance (MR) systems. The probe comprises a conductor loop for use juxtaposed to a patient. A tuning and matching section connects the probe to the receiver. The section tunes the loop to the desired Larmor frequency and matches the loop to the MR system. A N.lambda./2 length of shielded cable is used to couple the loop to the spatially removed tuning and matching section.

摘要翻译： 用于磁共振（MR）系统的小型化表面探针。 探针包括与病人并列使用的导体回路。 调谐和匹配部分将探头连接到接收器。 该部分将循环调谐到所需的拉莫尔频率，并将循环与MR系统相匹配。 Nλ/ 2长度的屏蔽电缆用于将环路耦合到空间移除的调谐和匹配部分。

公开(公告)号：US5049821A

公开(公告)日：1991-09-17

申请号：US479684

申请日：1990-02-15

申请人： George R. Duensing ,  Jeffrey R. Fitzsimmons ,  Don Sanford

发明人： George R. Duensing ,  Jeffrey R. Fitzsimmons ,  Don Sanford

IPC分类号： G01R33/341 ,  G01R33/36

CPC分类号： G01R33/341 ,  G01R33/3628

摘要： An NMR radio frequency (RF) surface coil allows the user to continuously vary the size of the field of view. The surface coil utilizes a modified radio frequency trombone for size adjustment that results in a stable resonant frequency of the coil over a wide range of dimensions such that retuning of the coil is unnecessary with changes in dimensions and variation of the field of view. The coil may be increased in area by as much as 60 percent while maintaining frequency stability to 1 MHz at 63.5 MHz and 2 MHz for full extension of 10 cm. The coil is readily adapted for imaging of the human spine, but can also be utilized for imaging other anatomical features.

摘要翻译： NMR射频（RF）表面线圈允许用户连续地改变视场的大小。 表面线圈利用改进的射频长号进行尺寸调节，其导致线圈在宽的范围内的稳定的谐振频率，使得线圈的重新调谐不需要尺寸变化和视场的变化。 线圈可以增加多达60％，同时将频率稳定性保持在1MHz，在63.5MHz和2MHz，完全扩展10cm。 线圈容易适用于人类脊柱的成像，但是也可用于对其他解剖特征进行成像。

公开(公告)号：US5041791A

公开(公告)日：1991-08-20

申请号：US562550

申请日：1990-08-06

申请人： Joseph J. H. Ackerman ,  Wei Chen

发明人： Joseph J. H. Ackerman ,  Wei Chen

IPC分类号： G01R33/341 ,  G01R33/36

CPC分类号： G01R33/3657 ,  G01R33/341 ,  G01R33/3621

摘要： An RF probe for use in magnetic resonance application includes a transmitter coil for transmitting RF energy to excite a specimen and receiver coil for sensing the RF energy absorbed or emitted by the specimen wherein, in a first embodiment, the receiver coil has a primary coil loop for placement immediately adjacent a specimen and a secondary coil loop, said receiver coil loops being anti-phase and connected in series and wherein the secondary receiver coil loop may be angularly rotated with respect to the transmit coil in order to balance the current induced in both receiver coil elements to achieve a zero net induced current from the transmit coil while the primary receiver coil element is in position for taking measurements. In a second embodiment, the receiver coil element has a pair of parallel connected anti-phase coil elements, and the primary coil element for placement immediately adjacent the specimen has a reduced inductance and, hence, impedance such that it exhibits an increased sensitivity and greater signal-to-noise ratio.

摘要翻译： 用于磁共振应用的RF探针包括用于发射RF能量以激发样本和接收器线圈的发射器线圈，用于感测由样本吸收或发射的RF能量，其中在第一实施例中，接收器线圈具有初级线圈环 为了直接邻近样本和次级线圈环放置，所述接收器线圈环路是反相的并且串联连接，并且其中次级接收器线圈环可以相对于发射线圈成角度地旋转，以平衡在两者中感应的电流 接收器线圈元件，以在主接收器线圈元件处于用于进行测量的位置时实现来自发射线圈的零净感应电流。 在第二实施例中，接收器线圈元件具有一对平行连接的反相线圈元件，并且用于紧邻样本的初级线圈元件具有减小的电感，并因此具有降低的灵敏度和更大的阻抗 信噪比。

公开(公告)号：US5030915A

公开(公告)日：1991-07-09

申请号：US483187

申请日：1990-02-20

申请人： Eddy B. Boskamp ,  Ching T. Lee

发明人： Eddy B. Boskamp ,  Ching T. Lee

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

CPC分类号： G01R33/3678 ,  G01R33/3415

摘要： A magnetic resonance imaging detection coil includes an outer coil divided into two symmetrical coils by a transverse central conductor. A 180.degree. phase shift network is coupled across the junction of the central transverse conductor with the outer conductor for providing the central conductor with a virtual ground potential when a magnetic field normal to the general plane of the coil system is present. The two coils formed by the central conductor and the outer conductor form parallel coils functioning similarly as a butterfly coil. The currents in the central conductor are cumulative, flowing in the same direction. The parallel coil system induces current on the central conductor which is 90.degree. out of phase with the current induced in the outer conductor. The signals corresponding to the parallel coil and series coil arrangement are then phase shift combined to place these signals in phase.

公开(公告)号：US4920318A

公开(公告)日：1990-04-24

申请号：US252819

申请日：1988-10-03

申请人： George J. Misic ,  Gregory C. Hurst ,  G. Neil Holland ,  John L. Patrick, III ,  Paul T. Orlando

发明人： George J. Misic ,  Gregory C. Hurst ,  G. Neil Holland ,  John L. Patrick, III ,  Paul T. Orlando

IPC分类号： G01R33/34 ,  G01R33/341 ,  G01R33/36

CPC分类号： G01R33/3628 ,  G01R33/34046 ,  G01R33/341 ,  G01R33/34007 ,  G01R33/34084 ,  G01R33/3657

摘要： A resonance exciting coil (C) excites magnetic resonance in nuclei 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 one or more loops (20) are adhered to receive signals from the resonating nuclei. Velcro straps (46) strap the flexible sheet and the attached coil into close conformity with the surface of the portion of the patient to be imaged. An impedance matching or coil resonant frequency adjusting network (50) is mounted on the flexible sheet for selectively adjusting at least one of an impedance match and the peak sensitivity resonant frequency of the receiving coil. A preamplifier (52) amplifies the received signals prior to transmission on a cable (24). A selectively variable voltage source (70) applies a selectively adjustable DC bias voltage to the cable for selectively adjusting at least one of the impedance match and the LC resonant frequency of the receiving coil. The received signals are amplified by an amplifier (82) and processed by an image processor (30) to form man-readable images of the examined region of the patient for display on a video display (32) or the like.

摘要翻译： 共振励磁线圈（C）在设置在已经产生主磁场和横向梯度的图像区域中的核中激发磁共振。 柔性接收线圈（D）包括柔性塑料片（40），一个或多个环（20）粘附在柔性塑料片上以接收来自谐振核的信号。 魔术贴带（46）将柔性片材和附接的线圈绑定成与待成像的患者部分的表面紧密一致。 阻抗匹配或线圈共振频率调整网络（50）安装在柔性片上，用于选择性地调节接收线圈的阻抗匹配和峰值灵敏度谐振频率中的至少一个。 前置放大器（52）在电缆（24）上传输之前放大所接收的信号。 选择性可变电压源（70）向电缆施加选择性可调节的直流偏置电压，用于选择性地调节接收线圈的阻抗匹配和LC谐振频率中的至少一个。 所接收的信号由放大器（82）放大并由图像处​​理器（30）处理，以形成用于在视频显示器（32）等上显示的被检查区域的人可读图像。

公开(公告)号：US4887038A

公开(公告)日：1989-12-12

申请号：US257399

申请日：1988-10-13

申请人： Jan Votruba ,  George R. Morris

发明人： Jan Votruba ,  George R. Morris

IPC分类号： G01R33/34 ,  G01R33/341

CPC分类号： G01R33/341 ,  G01R33/34084

摘要： Receiver coil for use with a Nuclear Magnetic Resonance Imaging (NMRI) instrument includes a flexible electrical conductor formed from a multiplicity of conductor strips connected in parallel and carried by a flexible insulator. The insulator is configured to be wrapped around an object to be imaged to form the conductor into a coil whose interior is substantially occupied by the object. Air vents may also be provided to improve the ventilation of air through the receiver coil in its wrapped configuration and to reduce any claustrophobic discomfort of a patient.

摘要翻译： 用于核磁共振成像（NMRI）仪器的接收器线圈包括由并联连接并由柔性绝缘体承载的多个导体条形成的柔性电导体。 绝缘体构造成围绕要成像的物体缠绕以形成导体，其内部基本上被物体占据。 还可以提供通风口以改善通过其包裹构型中的接收器线圈的空气的通风并减少患者的任何幽闭恐惧感。

公开(公告)号：US4882540A

公开(公告)日：1989-11-21

申请号：US213576

申请日：1988-06-28

申请人： Robert Domenick ,  Phillip Foreman ,  David M. Parish ,  Donald W. Pettibone

发明人： Robert Domenick ,  Phillip Foreman ,  David M. Parish ,  Donald W. Pettibone

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

CPC分类号： G01R33/3678 ,  G01R33/34046 ,  G01R33/365

摘要： Quadrature coils for magnetic resonance imaging (MRI apparatus) are in the form of loops constructed of foil bands of conductive material with their respective axes forming an angle with each other to provide the quadrature phase signals. Trapezoidal cutouts are in each loop to allow for entry of the head of a human being or other large specimen. The angle between the coils is adjusted to compensate for the cutouts to provide and maintain the quadrature phase signals. Inductive coupling between the coils is minimized by three rectangular trim foils which are parallel to the main magnetic field and placed adjacent to the coils.

公开(公告)号：US4879516A

公开(公告)日：1989-11-07

申请号：US199202

申请日：1988-05-26

申请人： Mehrdad Mehdizadeh ,  John L. Patrick ,  George J. Misic

发明人： Mehrdad Mehdizadeh ,  John L. Patrick ,  George J. Misic

IPC分类号： G01R33/34 ,  G01R33/341 ,  G01R33/36

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

摘要： A magnetic resonance imager includes a quadrature coil assembly (20) for transmitting radio frequency signals into and receiving magnetic resonance signal from an examination region. The quadrature coils assembly includes a first coil (22) and a second coil (24). A shunt path (32, 64, 74, 84, 94, 98, 100, 112, 114, 122) provides a current path by shunting at least a portion of one of the coils. A variable impedance (34, 66, 76, 86, 96, 110, 120) adjusts the amount of current flow through the shunt path and the current flow through the bypassed coil portion. More specifically, adjusting the impedance changes the magnetization vector generated by the coil assembly in a transmit mode and adjusts their relative isolation in a receive mode. The quadrature coils are mounted such that they are offset by about, but not quite, 90.degree.. The variable impedance is adjusted until the offset is brought precisely to 90.degree.. In this manner, the quadrature coils are adjusted electronically after assembly to insure the precision of their isolation.

摘要翻译： 磁共振成像器包括：正交线圈组件（20），用于将射频信号传送到检测区域并接收来自检查区域的磁共振信号。 正交线圈组件包括第一线圈（22）和第二线圈（24）。 分路（32,64,74,84,94,98,100,112,114,122）通过分流线圈中的一个的至少一部分来提供电流路径。 可变阻抗（34,66,76,86,96,110,120）调节通过分流路径的电流量和通过旁路线圈部分的电流。 更具体地，调整阻抗以发射模式改变由线圈组件产生的磁化矢量并且在接收模式中调整它们的相对隔离度。 正交线圈被安装成使得它们被偏移约90度，但不完全偏移90度。 调整可变阻抗，直到偏移精确到90度。 以这种方式，组装之后电子调整正交线圈以确保其隔离的精度。