公开(公告)号：US06356081B1

公开(公告)日：2002-03-12

申请号：US09449255

申请日：1999-11-24

申请人： George J. Misic

发明人： George J. Misic

IPC分类号： G01V300

CPC分类号： G01R33/3664 ,  G01R33/3415 ,  G01R33/3678

摘要： A coil interface for coupling a phased array magnetic resonance imaging coil to a magnetic resonance imaging system. The coil interface includes a plurality of signal inputs and a plurality of output ports. Each of the output ports is associated with a receiver in the magnetic resonance imaging system. The coil interface also includes an interface circuit. The interface circuit selectively couples at least two of the signal inputs to at least one of the plurality of input ports. Where the coil is a quadrature phased array coil, a preferred embodiment allows the two quadrature signals to be acquired as a single signal, precombined at the RF level within the coil interface, or as two separate RF signals by two of the receivers of the magnetic resonance imaging system hardware.

摘要翻译： 用于将相控阵磁共振成像线圈耦合到磁共振成像系统的线圈接口。 线圈接口包括多个信号输入和多个输出端口。 每个输出端口与磁共振成像系统中的接收器相关联。 线圈接口还包括接口电路。 接口电路将至少两个信号输入选择性地耦合到多个输入端口中的至少一个。 在线圈是正交相控阵线圈的情况下，优选实施例允许将两个正交信号作为在线圈接口内的RF电平预组合的单个信号获取，或者作为两个分离的RF信号由两个磁体的接收器 共振成像系统硬件。

公开(公告)号：US5610520A

公开(公告)日：1997-03-11

申请号：US201862

申请日：1994-02-24

申请人： George J. Misic

发明人： George J. Misic

IPC分类号： G01R33/341 ,  G01V3/00 ,  G01V3/14

CPC分类号： G01R33/3678

摘要： An MRI/MRS magnetic coil system is disclosed wherein the isolation between the coils can be adjusted to decrease or virtually eliminate the coupling between quadrature magnetic resonance imaging coils in order to optimize orthogonality between the coils. The adjustment allows the use of flexible coils which may be conformed to image specific anatomical regions. The RF characteristics of the coils are controlled by variable capacitors. The capacitors are controlled by a remote automatic controller which functions to adjust the RF characteristics of the coils until an optimal orthogonality and signal to noise ratio is achieved between and by the coils.

摘要翻译： 公开了一种MRI / MRS电磁线圈系统，其中可以调节线圈之间的隔离以减少或实际上消除正交磁共振成像线圈之间的耦合，以便优化线圈之间的正交性。 该调整允许使用可以符合图像特定解剖区域的柔性线圈。 线圈的RF特性由可变电容器控制。 电容器由远程自动控制器控制，该控制器用于调节线圈的RF特性，直到在线圈之间和线圈之间实现最佳的正交性和信噪比。

公开(公告)号：US4764726A

公开(公告)日：1988-08-16

申请号：US903983

申请日：1986-09-05

申请人： George J. Misic ,  Paul T. Orlando

发明人： George J. Misic ,  Paul T. Orlando

IPC分类号： G01R33/341 ,  G01R33/36 ,  G01R33/20

CPC分类号： G01R33/3678 ,  G01R33/3621 ,  G01R33/3614

摘要： During a transmit cycle portion, a radio frequency transmitter (C) continuously generates an AC biasing signal and selectively generates a radio frequency signal. The AC biasing signal gates a first switch (10) and a second switch (32) such that the radio frequency signals from the transmitter are conducted to a magnetic resonance probe (E) but are blocked from being conducted to a receiver (F). A first filter (20) prevents the bias signals from being applied to the probe. The second switch includes a pair of crossed diodes (34, 36) which are gated conductive by the AC bias signal. A filter (72) passes the radio frequency signals but not the bias signals to ground to prevent the radio frequency signals from reaching the receiver. A filter (80) allows the bias signals to be applied across a load (88) such that the transmitter sees the load at the bias signal frequency. Another filter (40) prevents the bias signal from reaching the transmitter. An additional switch (50) provides further isolation between the receiver and the transmitter during the transmit cycle portion. During the receive cycle portion, radio frequency signals received by the probe pass through the filters (20,40) directly to the receiver but are blocked by switch (10) from passing to the transmitter.

摘要翻译： 在发射周期部分期间，射频发射机（C）连续产生AC偏置信号，并选择性地产生射频信号。 AC偏置信号将第一开关（10）和第二开关（32）置入门限，使得来自发射器的射频信号被传导到磁共振探头（E），但被阻止不被传导到接收器（F）。 第一滤波器（20）防止偏置信号被施加到探头。 第二开关包括一对交流二极管（34,36），它们被交流偏压信号门控导通。 滤波器（72）将射频信号而不是偏置信号传递到地，以防止射频信号到达接收机。 滤波器（80）允许跨越负载（88）施加偏置信号，使得发射器以偏置信号频率看到负载。 另一个滤波器（40）防止偏置信号到达发射器。 附加开关（50）在发射周期部分期间在接收器和发射器之间提供进一步的隔离。 在接收周期部分期间，由探头接收的射频信号直接通过滤波器（20,40）到接收器，但是由开关（10）阻止传送到发射机。

公开(公告)号：US07508214B2

公开(公告)日：2009-03-24

申请号：US11751115

申请日：2007-05-21

申请人： George J. Misic

发明人： George J. Misic

IPC分类号： G01V3/00

CPC分类号： G01R33/3415 ,  G01R33/288

摘要： Systems and methods for the selection of and application of RF power to a plurality of transmit and/or transmit/receive coil elements to decrease patient SAR and to limit the potential for artifact problems. Without any change to the hardware or software of an MR scanner, the present local coil system provides system logic and coil design flexibility such that only transmit coil elements that are required for a particular portion of an MR scan will be utilized at that time. The local coil system may include any combination of transmit-only, receive-only and transmit/receive coil elements as part of the coil system (array of coil elements). The logic controller of the local coil system gathers input data from the MR scanner, from the attached coil elements and optionally from one or more sensors attached to the coil system itself.

摘要翻译： 用于选择和应用RF功率到多个发射和/或发射/接收线圈元件以降低患者SAR并限制伪影问题潜力的系统和方法。 本发明的本地线圈系统不对MR扫描器的硬件或软件进行任何改变，从而提供了系统逻辑和线圈设计灵活性，使得仅在MR扫描的特定部分所需的传输线圈元件将被利用。 本地线圈系统可以包括作为线圈系统（线圈元件阵列）的一部分的仅发射，仅接收线圈和发射/接收线圈元件的组合。 局部线圈系统的逻辑控制器从MR扫描器收集来自连接的线圈元件的输入数据，并且可选地从连接到线圈系统本身的一个或多个传感器收集输入数据。

公开(公告)号：US06831460B2

公开(公告)日：2004-12-14

申请号：US10068300

申请日：2002-02-05

申请人： Theodore J. Reisker ,  William J. Monski ,  Eric D. Reid ,  George J. Misic

发明人： Theodore J. Reisker ,  William J. Monski ,  Eric D. Reid ,  George J. Misic

IPC分类号： G01V300

CPC分类号： G01R33/34046

摘要： A coil for creating improved homogeneity in magnetic flux density in a radio frequency resonator for magnetic resonance imaging and spectroscopy of the human head. The coil has a plurality of conductive members. Each of the conductive members has a linear portion and a tapered portion. The conductive members are arranged to form a first opening having a first diameter and a second opening having a second diameter, with the second diameter being different from the first diameter. The tapered portions of the conductive members provide the coil with a substantially homogeneous pattern of magnetic flux density in at least one of three orthogonal imaging planes of the coil.

摘要翻译： 一种线圈，用于在用于磁共振成像和人头的光谱的射频谐振器中产生改善的磁通密度均匀性。 线圈具有多个导电构件。 每个导电构件具有直线部分和锥形部分。 导电构件布置成形成具有第一直径的第一开口和具有第二直径的第二开口，第二直径不同于第一直径。 导电构件的锥形部分在线圈的三个正交成像平面中的至少一个中为线圈提供基本均匀的磁通密度图案。

公开(公告)号：US06714013B2

公开(公告)日：2004-03-30

申请号：US10151491

申请日：2002-05-20

申请人： George J. Misic

发明人： George J. Misic

IPC分类号： G01N300

CPC分类号： G01R33/3415

摘要： A magnetic resonance imaging receiver/transmitter coil system for providing images for regions of interest includes a first phased array formed of a plurality of electrically conductive members and defining an array volume and a second phased array formed of a second plurality of electrically conductive members and disposed at least partially within the defined array volume. At least one of the first and second phased arrays is adapted to apply a magnetic field to the defined array volume. At least one of the first and second phased arrays is further adapted to receive said applied magnetic field. The first phased array is extendible to define a further array volume and is provided with a switch for electrically coupling and decoupling an extension to effectively extend the length of the first phased array and thereby define the further array volume. In this manner the length of the first phased array is effectively extended to approximately twice its unextended length.

摘要翻译： 用于为感兴趣区域提供图像的磁共振成像接收器/发射器线圈系统包括由多个导电构件形成并限定阵列体积的第一相控阵列和由第二多个导电构件形成的第二相控阵列， 至少部分地在定义的阵列卷内。 第一和第二相控阵列中的至少一个适于将磁场施加到限定的阵列体积。 所述第一和第二相控阵列中的至少一个进一步适于接收所述施加的磁场。 第一相控阵可扩展以限定另一个阵列体积，并设置有用于电耦合和解耦延伸的开关，以有效地延长第一相控阵列的长度，从而限定另外的阵列体积。 以这种方式，第一相控阵列的长度有效地延伸到其未延伸长度的大约两倍。

公开(公告)号：US06344745B1

公开(公告)日：2002-02-05

申请号：US09449256

申请日：1999-11-24

申请人： Theodore J. Reisker ,  William J. Monski ,  Eric D. Reid ,  George J. Misic

发明人： Theodore J. Reisker ,  William J. Monski ,  Eric D. Reid ,  George J. Misic

IPC分类号： G01V300

CPC分类号： G01R33/34046

摘要： A method for creating improved homogeneity in magnetic flux density in a radio frequency resonator for magnetic resonance imaging and spectroscopy of the human head. A tapered birdcage resonator is also provided. The tapered birdcage resonator includes two electrically conductive rings and a plurality of rods or conductor legs. The first electrically conductive ring forms an inferior end of the coil. The plurality of legs extends from the first electrically conductive ring. Each of the plurality of legs has a linear portion and a tapered portion. The second electrically conductive ring forms a superior end of the coil and is connected to the tapered portion of the plurality of legs.

摘要翻译： 用于在用于磁共振成像和人头的光谱的射频谐振器中产生改善的磁通密度均匀性的方法。 还提供了锥形鸟笼谐振器。 锥形鸟笼谐振器包括两个导电环和多个杆或导体腿。 第一导电环形成线圈的下端。 多个腿从第一导电环延伸。 多个腿部中的每一个具有直线部分和锥形部分。 第二导电环形成线圈的上端并且连接到多个腿的锥形部分。

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：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。

公开(公告)号：US4841248A

公开(公告)日：1989-06-20

申请号：US86277

申请日：1987-08-17

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： G01R33/34046 ,  G01R33/341 ,  G01R33/36 ,  G01R33/3628

摘要： Magnets (12) create a main magnetic field along a z-axis through an image region. A localized coil (D) is disposed in the image region at least to receive magnetic resonance signals from nuclei of the subject which have been induced to resonance. The localized coil includes an inner conductor (30), preferably a plate, which defines a current path extending along the z-axis. The inner conductor is mounted closely adjacent and parallel to a surface of the subject. An outer conductor (32), preferably also a plate, is mounted parallel to but further from the subject than the first conductor. A connecting member (34) interconnects a first end of the inner and outer conductors and is disposed perpendicular to the z-axis. A matching circuit (36) including capacitors (50) which define the resonant frequency of the coil are connected adjacent second ends of the inner and outer conductors. Because the nuclei induced to resonance within the z-axis magnetic field generate magnetic resonance components in the x-y plane, an optimal coupling is achieved to reception of the magnetic resonance signals.

摘要翻译： 磁体（12）通过图像区域沿z轴产生主磁场。 至少在图像区域中设置局部线圈（D）以接收已经被诱导到共振的受试者的核的磁共振信号。 局部线圈包括限定沿z轴延伸的电流路径的内导体（优选为板）。 内部导体紧密地安装在主体表面上并平行。 外导体（32），优选地也是板，与第一导体平行但是远离被检体安装。 连接构件（34）将内导体和外导体的第一端互连并且垂直于z轴布置。 包括限定线圈的谐振频率的电容器（50）的匹配电路（36）被连接在内导体和外导体的第二端附近。 因为在z轴磁场内引起谐振的核在x-y平面中产生磁共振分量，所以实现了接收磁共振信号的最佳耦合。