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：US20090021261A1

公开(公告)日：2009-01-22

申请号：US10597018

申请日：2005-01-05

申请人： Thomas Chmielewski ,  William O. Braum ,  John T. Carlon

发明人： Thomas Chmielewski ,  William O. Braum ,  John T. Carlon

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。

公开(公告)号：US06593744B2

公开(公告)日：2003-07-15

申请号：US09989824

申请日：2001-11-20

申请人： Michael Burl ,  Thomas Chmielewski ,  William O. Braum

发明人： Michael Burl ,  Thomas Chmielewski ,  William O. Braum

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。

公开(公告)号：US06320385B1

公开(公告)日：2001-11-20

申请号：US09399292

申请日：1999-09-17

申请人： Michael Burl ,  Thomas Chmielewski ,  William O. Braum

发明人： Michael Burl ,  Thomas Chmielewski ,  William O. Braum

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。

公开(公告)号：US20070262777A1

公开(公告)日：2007-11-15

申请号：US11575151

申请日：2005-08-19

申请人： Marcel Warntjes ,  Marinus Van Helvoort ,  Thomas Chmielewski ,  Steven Koenig ,  Thomas Chmielewski

发明人： Marcel Warntjes ,  Marinus Van Helvoort ,  Thomas Chmielewski ,  Steven Koenig ,  Thomas Chmielewski

IPC分类号： G01V3/00

CPC分类号： G01R33/3657 ,  G01R33/34007 ,  G01R33/3628

摘要： A low profile radio frequency coil (32, 44, 441, 442, 443) for use in a magnetic resonance imaging system includes a low profile antenna (34, 102, 202, 302) that is configured to resonate at about a magnetic resonance frequency of the magnetic resonance imaging system. A generally planar inductor (110, 112, 210, 240, 310) is electrically connected or coupled with the low profile antenna. The generally planar inductor provides selected frequency filtering of a radio frequency signal received by or transmitted by the low profile antenna.

摘要翻译： 一种用于磁共振成像系统的低频无线电频率线圈（32,44,44个，44个，44个3）包括 配置为在磁共振成像系统的大约磁共振频率下谐振的低剖面天线（34,102,202,302）。 大体上平面的电感器（110,112,210,240,310）与薄型天线电连接或耦合。 通常平面的电感器提供由低轮廓天线接收或由低轮廓天线发送的射频信号的选择的频率滤波。

公开(公告)号：US08154291B2

公开(公告)日：2012-04-10

申请号：US11843744

申请日：2007-08-23

申请人： Thomas Chmielewski ,  Brian J. Cohen ,  Yiping Guan

发明人： Thomas Chmielewski ,  Brian J. Cohen ,  Yiping Guan

IPC分类号： G01V3/00

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

摘要： The present invention relates to an element configuration within an RF coil for use for MRI. The invention provides for an inherently electromagnetically decoupled solenoid element pair for receiving radio frequency magnetic resonance signals within a vertical field MRI system. The elements of the solenoid element pair described herein are typically positioned in a coplanar, side-by-side position. The decoupling of the solenoid pair can be accomplished through numerous methods including but not limited to an overlapping between the elements of the solenoid pair, use of a capacitor shared between the elements of the solenoid pair, or the use of overlapped inductors between the elements of the solenoid pair.

摘要翻译： 本发明涉及用于MRI的RF线圈内的元件结构。 本发明提供了用于在垂直场MRI系统内接收射频磁共振信号的固有的电磁去耦螺线管元件对。 这里描述的螺线管元件对的元件通常位于共面的并排位置。 螺线管对的解耦可以通过多种方法来实现，包括但不限于螺线管对的元件之间的重叠，螺线管对元件之间共用的电容器的使用，或者使用重叠的电感器 螺线管对。

公开(公告)号：US07288938B2

公开(公告)日：2007-10-30

申请号：US10560216

申请日：2004-05-28

申请人： Thomas Chmielewski ,  John T. Carlon

发明人： Thomas Chmielewski ,  John T. Carlon

IPC分类号： G01V3/00

CPC分类号： G01R33/34046

摘要： A split-top RF coil is provided. The split-top RF coil includes a first housing (80) having a first RF coil portion (41) disposed therein and a second housing (84) having a second RF coil portion (42) disposed therein. A plurality of slides (100) disposed on at least one of the housings and a plurality of slide tracks (101) are disposed the housing opposite the slides for receiving the slides. The first and second housings are mechanically coupled via the slides and slide tracks. The RF coil also includes a plurality of electric connector pins (110) disposed on at least one of the housings and a plurality of pin receivers (111) disposed on the housing opposite the pins for receiving the conductor pins. Electric connections between the first and second coil RF coil portions are made via the pins and receivers.

摘要翻译： 提供分体式射频线圈。 分体RF线圈包括具有设置在其中的第一RF线圈部分（41）的第一壳体（80）和设置在其中的具有第二RF线圈部分（42）的第二壳体（84）。 设置在至少一个壳体上的多个滑动件（100）和多个滑动轨道（101），其与滑块相对设置用于接收滑块。 第一和第二壳体通过滑块和滑动轨道机械耦合。 RF线圈还包括设置在至少一个壳体上的多个电连接器插脚（110）和设置在壳体上的与插脚相对的多个针式接收器（111），用于接收导体引脚。 第一和第二线圈RF线圈部分之间的电连接经由引脚和接收器进行。

公开(公告)号：US07180291B2

公开(公告)日：2007-02-20

申请号：US10536334

申请日：2003-11-25

申请人： Thomas Chmielewski ,  James A. Flock ,  Timothy Eagan

发明人： Thomas Chmielewski ,  James A. Flock ,  Timothy Eagan

IPC分类号： G01V3/00

CPC分类号： G01R33/34046

摘要： A birdcage coil (16) used in conjunction with a magnetic resonance imaging apparatus includes a first conductive loop (81, 581), a second conductive loop (82, 582), and a plurality of first conductor rungs (80, 580) disposed between the first and second conductive loops. A third conductor (83, 83″, 583) is coupled to the second conductive loop at resonance frequencies, such as by second conductor rungs (84, 84″, 584). The birdcage coil also includes switches (590) for switching the birdcage coil at least among: 1) an RF transmit mode to operate as an RF transmit coil; and 2) an RF receive mode to operate as an RF receive coil.

摘要翻译： 与磁共振成像装置结合使用的鸟笼线圈（16）包括第一导电回路（81,581），第二导电回路（82,582）和多个第一导体梯级（80,580） 第一和第二导电回路。 第三导体（83,83“，583）以共振频率，例如通过第二导体梯级（84,84”，584）耦合到第二导电回路。 鸟笼线圈还包括用于至少在以下各项之间切换鸟笼线圈的开关（590）：1）RF发射模式以用作RF发射线圈; 和2）用作RF接收线圈的射频接收模式。

公开(公告)号：US06414488B1

公开(公告)日：2002-07-02

申请号：US09516978

申请日：2000-03-01

申请人： Thomas Chmielewski

发明人： Thomas Chmielewski

IPC分类号： G01V300

CPC分类号： G01R33/3657

摘要： A magnetic resonance imaging apparatus creates images by exciting magnetic resonance in selected nuclei disposed within an image region. Through the image region a main magnetic field (B0) is applied and transverse gradients are produced. At selected times a high power RF pulse is applied to the imaging region causing the selected nuclei to resonate. These magnetic resonance signals are detected by a receive coil (D1, D2) and converted into an image representation viewable on a display (24). Images are obtained by repeating the transmit and receive portions until enough image data is received to produce an image. The receive coil (D1, D2) includes first decoupler circuits (28) arranged about the coil. During the transmit portion of the cycle, the decoupler circuits sense the high power RF pulse and decouple the coil. High speed switching diodes or PIN diodes are excited by the transmit RF pulse to switch inductors (40) into the coil to decouple the receive coil. During a receive portion of a cycle in which the coil is not used, a DC bias is selectively applied to the coil forcing the diodes on, actively decoupling the coil. The DC bias also biases a diode switch (50, 50′) to short the input of a preamplifier element (48, 48′) providing protection.

摘要翻译： 磁共振成像装置通过在设置在图像区域内的所选择的核中激发磁共振来产生图像。 通过图像区域施加主磁场（B0）并产生横向梯度。 在选定的时间，将高功率RF脉冲施加到成像区域，导致所选择的核谐振。 这些磁共振信号由接收线圈（D1，D2）检测并转换成可在显示器（24）上显示的图像表示。 通过重复发送和接收部分直到获得足够的图像数据以产生图像来获得图像。 接收线圈（D1，D2）包括绕线圈布置的第一去耦电路（28）。 在循环的发射部分期间，去耦电路感测高功率RF脉冲并使线圈解耦。 高速开关二极管或PIN二极管被发射RF脉冲激发，以将电感器（40）切换到线圈中以使接收线圈去耦。 在不使用线圈的周期的接收部分期间，选择性地将DC偏压施加到强制二极管的线圈上，主动地使线圈解耦。 DC偏压还偏置二极管开关（50,50'）以缩短提供保护的前置放大器元件（48,48'）的输入。

公开(公告)号：US20090164232A1

公开(公告)日：2009-06-25

申请号：US12174591

申请日：2008-07-16

申请人： Thomas Chmielewski ,  Denise James

发明人： Thomas Chmielewski ,  Denise James

IPC分类号： G06Q40/00

CPC分类号： G06Q40/02 ,  G06Q30/0185 ,  G06Q40/00 ,  G06Q40/025 ,  G06Q50/16 ,  G06Q50/18

摘要： Mortgage fraud detection systems and methods are provided. A fraud detection system can generally comprise a database operator, a database manager, one or more users, and a database. Database components can be implemented as hardware, software, or a combination of both. A fraud detection method can generally comprise providing a database for maintaining a plurality of records. Data records can be continually received by a database in batchwise or single submission protocols. Records can be compared to determine whether they contain common data in one or more predetermined fields. If records contain common data in one or more predetermined fields, records can be examined for inconsistencies in one or more other data fields. Discovered inconsistencies and magnitudes of inconsistencies can be warning signs of fraud. Results of comparisons can be reported to system users to enable such users to investigate additional circumstances. Other embodiments and features are also claimed and described in the application.

摘要翻译： 提供了抵押欺诈检测系统和方法。 欺诈检测系统通常可以包括数据库操作者，数据库管理器，一个或多个用户和数据库。 数据库组件可以实现为硬件，软件或两者的组合。 欺诈检测方法通常可以包括提供用于维护多个记录的数据库。 数据记录可以由数据库以分批或单次提交协议连续接收。 可以比较记录以确定它们是否在一个或多个预定字段中包含公共数据。 如果记录在一个或多个预定字段中包含公共数据，则可以检查记录以在一个或多个其他数据字段中的不一致性。 发现不一致和不一致的程度可能是欺诈的警告标志。 比较结果可以向系统用户报告，以使这些用户能够调查其他情况。 其他实施例和特征也在申请中被要求保护和描述。