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1.发明申请Rf trap tuned by selectively inserting electrically conductive tuning elements 审中-公开通过选择性地插入导电调谐元件来调谐Rf陷波器公开(公告)号：US20090021261A1
公开(公告)日：2009-01-22
申请号：US10597018
申请日：2005-01-05
IPC分类号： G01R33/36
CPC分类号： G01R33/3685 , G01R33/34007 , G01R33/3628
摘要： A magnetic resonance imaging scanner (10) includes a main magnet (20) generating a spatially uniform main magnetic field at least over a field of view, a plurality of gradient coils (30) selectively generating magnetic field gradients at least over the field of view, and a radio frequency coil (32, 34) for performing at least one of exciting and detecting magnetic resonance at the selected resonance frequency in an imaging subject disposed in the field of view. A radio frequency trap (60, 60′) connected with the radio frequency coil (32, 34) includes helically grooved dielectric formers (62, 62) around which a coaxial cable (64) is wrapped. A plurality of electrically conductive tuning elements such as screws or rods (84, 90) are selectively inserted into the dielectric formers (62, 62) to tune the radio frequency trap (60, 60) to a selected resonance frequency by adjusting the inductance of the trap.
摘要翻译： 磁共振成像扫描仪（10）包括至少在视场上产生空间上均匀的主磁场的主磁体（20），多个梯度线圈（30）至少在视场上产生磁场梯度 以及射频线圈（32,34），用于在设置在视野中的成像对象中执行激励和检测在所选谐振频率处的磁共振中的至少一个。 与射频线圈（32,34）连接的射频陷波器（60,60'）包括螺旋沟槽电介质形成器（62,62），同轴电缆（64）绕其周围缠绕。 多个导电调谐元件（例如螺钉或杆（84,90））被选择性地插入到电介质成形器（62,62）中，以通过调节电感（60,60）来调谐射频陷波器（60,60）到所选择的谐振频率 陷阱。
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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
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）。
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公开(公告)号：US5336988A
公开(公告)日：1994-08-09
申请号：US16042
申请日：1993-02-10
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。
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公开(公告)号：US06593744B2
公开(公告)日：2003-07-15
申请号：US09989824
申请日：2001-11-20
IPC分类号： G01V300
CPC分类号： G01R33/3621 , G01R33/3685
摘要： A multi-channel RF cable trap (70) blocks stray RF current from flowing on shield conductors (114) of coaxial RF cables (60) of a magnetic resonance apparatus. An inductor (116) is formed by a curved semi-rigid trough (80) constructed of an insulating material coated with an electrically conducting layer. Preferably, the inductor (116) and the cable follow an “S”-shaped path to facilitate good electromagnetic coupling therebetween. The RF cables (60) are laid in the trough (80) and the shield conductors inductively couple with the inductor (116). A capacitor (82) and optional trim capacitor (83) are connected across the the trough of the inductor (116) to form a resonant LC circuit tuned to the resonance frequency. The LC circuit inductively couples with the shield conductors (114) to present a high, signal attenuating impedance at the resonance frequency. The resonant circuit is preferably contained in an RF-shielding box (84) with removable lid.
摘要翻译： 多通道RF电缆阱（70）阻挡杂散RF电流流过磁共振设备的同轴RF电缆（60）的屏蔽导体（114）上。 电感器（116）由涂覆有导电层的绝缘材料构成的弯曲半刚性槽（80）形成。 优选地，电感器（116）和电缆遵循“S”形路径，以便于它们之间良好的电磁耦合。 RF电缆（60）放置在槽（80）中，屏蔽导体与电感器（116）感应耦合。 电容器（82）和可选的调整电容器（83）跨越电感器（116）的沟槽连接，以形成调谐到谐振频率的谐振LC电路。 LC电路与屏蔽导体（114）感应耦合以在谐振频率处呈现高信号衰减阻抗。 谐振电路优选地包含在具有可移除盖的RF屏蔽盒（84）中。
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公开(公告)号：US06320385B1
公开(公告)日：2001-11-20
申请号：US09399292
申请日：1999-09-17
IPC分类号： G01V300
CPC分类号： G01R33/3657
摘要： A multi-channel balun (70, 72) blocks stray RF current from flowing on shield conductors of coaxial RF cables of a magnetic resonance apparatus. The balun comprises a parallel combination of an even number of helical coils of shielded transmission cable (L10, L12; L14, L16, L18, L20) wound in alternate directions such that voltages iduced by their external RF fields cancel. One capacitor (C10; C16, C18) is connected in parallel symmetrically with each pair of helical coils, with trim capacitors (C12; C22) fixed in the coil plug (86, 90) to retune the balun as required. The multi-channel balun (70, 72) accommodates magnetic resonance systems with an odd or even number of channels without requiring shielding. Preferably, the balun (70, 72) is constructed on a single circuit board in a close-packed relationship that is compact and space efficient, yet provides better decoupling from the transmit field.
摘要翻译： 多通道平衡 - 不平衡转换器（70,72）阻止杂散RF电流流过磁共振设备的同轴RF电缆的屏蔽导体。 平衡 - 不平衡变换器包括平行组合的偶数个屏蔽传输电缆的螺旋线圈（L10，L12; L14，L16，L18，L20），其交替方向缠绕，使得由其外部RF场产生的电压消除。 一对电容器（C10; C16，C18）与每对螺旋线圈对称连接，固定在线圈插头（86,90）中的微调电容器（C12; C22）根据需要重新调整平衡 - 不平衡转换器。 多通道平衡 - 不平衡转换器（70,72）可容纳具有奇数或偶数个通道的磁共振系统，而不需要屏蔽。 优选地，平衡不平衡变换器（70,72）以紧凑且空间有效的紧密堆叠关系构建在单个电路板上，但是提供与发射场的更好的解耦。
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公开(公告)号：US06316941B1
公开(公告)日：2001-11-13
申请号：US09513062
申请日：2000-02-24
IPC分类号： G01V300
CPC分类号： G01R33/34046
摘要： A tunable radio frequency birdcage coil (30) is oriented vertically in a bore-type magnetic resonance apparatus. The birdcage coil (30) includes a pair of end rings (60, 62) disposed in parallel planes along a coil axis which is orthogonal to the main magnetic field. A plurality of rungs (64) electrically interconnect the end rings (60, 62) to form a generally cylindrical volume. The end rings (60, 62) and rungs (64) are mounted on a hinged (68) dielectric former (66). Conductive connectors (70) releasably fasten the end rings (60, 62) so that the coil (30) may be opened and closed to receive a portion of a subject to be examined. A conductive loop (80) is inductively coupled and positioned parallel to the end rings (60, 62). The conductive loop (80) is slidably adjustable along the coil axis for matching and tuning end-ring modes of the coil. The coil is oriented to provide a subject disposed therein with an open view for fMRI applications. Means for stimulating the visual senses (100) is mounted adjacent the examination region (14) to facilitate fMRI applications.
摘要翻译： 可调谐射频鸟笼线圈（30）在孔型磁共振装置中垂直取向。 鸟笼线圈（30）包括沿着与主磁场正交的线圈轴设置在平行平面中的一对端环（60,62）。 多个梯级（64）电连接端环（60,62）以形成大致圆柱形的体积。 端环（60,62）和梯级（64）安装在铰接（68）电介质成形器（66）上。 导电连接器（70）可释放地紧固端环（60,62），使得线圈（30）可以被打开和关闭以接收待检查对象的一部分。 导电回路（80）感应耦合并平行于端环（60,62）定位。 导电回路（80）可沿着线圈轴线可滑动地调节，以匹配和调谐线圈的端环模式。 线圈被定向成提供设置在其中的对象用于fMRI应用的开放视图。 用于刺激视觉感觉的装置（100）安装在检查区域（14）附近，以便于fMRI应用。
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7.发明授权Birdcage RF coil employing an end ring resonance mode for quadrature operation in magnetic resonance imaging 失效鸟笼RF线圈采用端环谐振模式进行磁共振成像中的正交运算公开(公告)号：US06522143B1
公开(公告)日：2003-02-18
申请号：US09398650
申请日：1999-09-17
申请人： Hiroyuki Fujita , William O. Braum
发明人： Hiroyuki Fujita , William O. Braum
IPC分类号： G01V300
CPC分类号： G01R33/34046 , G01R33/3628
摘要： A magnetic resonance apparatus includes a main magnetic field source (12) for providing a magnetic field (B0) along a main field axis. A transmitter (34) and transmit coils (30, 32) excite a nuclei of an object to resonate. The resonating nuclei generate magnetic resonance signals detected by a volume coil (50) including a pair of end rings (70, 72) separated along a coil axis (Y). The end rings (70, 72) are electrically interconnected by a plurality of rungs (74) disposed about the rings. A conductive loop (80) is concentrically disposed between and inductively coupled to the end rings. The loop includes an electrical conductor (82) preferably surrounding the rungs (74), and positioned parallel to the end rings (70, 72). A capacitive element (84), in electrical communication with the conductor (82), is selected or adjusted to tune the loop (80) to signals at a selected frequency. Moreover, the loop (80) is slidably positionable along the coil axis (Y) and has an adjustable capacitor (84) to match or tune the loop to signals at the selected frequency.
摘要翻译： 磁共振装置包括用于沿主场轴提供磁场（B0）的主磁场源（12）。 发射器（34）和发射线圈（30,32）激发物体的核以产生谐振。 谐振核产生由包括沿着线圈轴线（Y）分离的一对端环（70,72）的体积线圈（50）检测的磁共振信号。 端环（70,72）通过围绕环设置的多个梯级（74）电互连。 导电回路（80）同心地设置在端环之间并感应耦合到端环。 环路包括优选围绕梯级（74）并且平行于端环（70,72）定位的电导体（82）。 选择或调整与导体（82）电连通的电容元件（84），以将环路（80）调谐到选定频率的信号。 此外，环路（80）可沿着线圈轴线（Y）可滑动地定位，并且具有可调电容器（84），以将环路与所选频率的信号相匹配或调谐。
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公开(公告)号：US5757189A
公开(公告)日：1998-05-26
申请号：US757240
申请日：1996-11-27
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。
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公开(公告)号：US5578925A
公开(公告)日：1996-11-26
申请号：US512274
申请日：1995-08-18
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。
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