公开(公告)号：US06661229B2

公开(公告)日：2003-12-09

申请号：US09845594

申请日：2001-04-30

申请人： Daniel J. Weyers ,  Shizhe Li ,  David E. Dean

发明人： Daniel J. Weyers ,  Shizhe Li ,  David E. Dean

IPC分类号： G01V300

CPC分类号： G01R33/34046 ,  G01R33/34007

摘要： An RF birdcage coil for use in MRI systems is disclosed. A number of slotted or nonconductive channels are provided in the conductive material of the RF coil to minimize the size of the conductive paths available for eddy currents. Furthermore, blocking capacitors are applied between the legs and the end segments of the conductive elements to isolate the end segments from the legs at low frequency harmonics, such as those associated with eddy currents, while acting substantially as a short circuit at high operational frequencies. Preferably, the blocking capacitors are constructed by providing the legs of a plurality of I-beams on a first side of a dielectric material, and the end segments on an opposing side. The blocking capacitor results from overlapping the conductive material forming the leg and end segment on opposite sides of the dielectric material.

公开(公告)号：US07102350B2

公开(公告)日：2006-09-05

申请号：US10710278

申请日：2004-06-30

申请人： Daniel J. Weyers ,  Qin Liu

发明人： Daniel J. Weyers ,  Qin Liu

IPC分类号： G01V3/00

CPC分类号： G01R33/34046 ,  G01R33/422

摘要： An apparatus for MRI having an RF birdcage coil and an RF shield is disclosed. The RF birdcage coil includes a coil axis, an end ring portion disposed about the axis, and a plurality of legs disposed parallel to the axis and in signal communication with the end ring portion. The RF shield is disposed about the coil and is in signal communication therewith. The shield includes a cylindrical conductive sheet having first and second ends, and a plurality of sets of discontinuous slots disposed about the cylindrical sheet and running between the first and second ends, wherein a region of discontinuity within a set of the slots is aligned with the end ring portion.

摘要翻译： 公开了一种具有射频鸟笼线圈和射频屏蔽的MRI装置。 RF鸟笼线圈包括线圈轴线，围绕轴线设置的端环部分和平行于轴线设置并与端环部分信号连通的多个腿部。 RF屏蔽围绕线圈设置并与其进行信号通信。 屏蔽包括具有第一和第二端的圆柱形导电片和围绕圆柱形片设置并在第一和第二端之间延伸的多组不连续槽，其中一组槽内的不连续区域与 端环部分。

公开(公告)号：US06590392B2

公开(公告)日：2003-07-08

申请号：US09681498

申请日：2001-04-17

申请人： Ed B. Boskamp ,  Daniel J. Weyers

发明人： Ed B. Boskamp ,  Daniel J. Weyers

IPC分类号： G01V300

CPC分类号： G01R33/34053 ,  G01R33/34 ,  G01R33/34069 ,  G01R33/34076 ,  G01R33/3415 ,  G01R33/3664

摘要： An MRI apparatus and method for minimizing mutual inductance between a center coil and an end coil configuration that reduces wrap-around artifacts in an MR image is provided. The switchable FOV coil configuration includes first and second RF coils aligned along a first axis. The second RF coil is coupled to the first RF coil to form a pair of end saddle coils. A central RF coil is also included having a length along the first axis and positioned at least partially within the end saddle coils such that activation of the central RF coil alone or in combination with the end saddle coils provides differing FOV's for imaging.

公开(公告)号：US07135864B1

公开(公告)日：2006-11-14

申请号：US11161037

申请日：2005-07-20

申请人： Graeme C. McKinnon ,  Daniel J. Weyers

发明人： Graeme C. McKinnon ,  Daniel J. Weyers

IPC分类号： G01V3/00

CPC分类号： G01R33/34046 ,  G01R33/345

摘要： An RF coil apparatus for generating an elliptical polarization field includes an RF coil assembly having a pair of independent drive channels connected thereto. The drive channels are driven such that an elliptical polarization field is generated in a volume-of-interest within the RF coil assembly. The elliptical polarization field is generated about a subject having a generally elliptical cross-section disposed within the volume-of-interest.

摘要翻译： 用于产生椭圆偏振场的RF线圈装置包括具有与其连接的一对独立驱动通道的RF线圈组件。 驱动通道被驱动，使得在RF线圈组件内的感兴趣体积中产生椭圆极化场。 椭圆偏振场围绕被设置在感兴趣体积内的具有大致椭圆截面的被摄体产生。

公开(公告)号：US06487436B1

公开(公告)日：2002-11-26

申请号：US09681494

申请日：2001-04-17

申请人： Ed B. Boskamp ,  Daniel J. Weyers

发明人： Ed B. Boskamp ,  Daniel J. Weyers

IPC分类号： A61B5055

CPC分类号： G01R33/34046 ,  G01R33/56545

摘要： An MRI apparatus and method for reducing wrap around artifacts during image reconstruction is provided. An RF coil and control configuration includes a center coil and at least one pair of end RF coils configured to encode and excite spins over an adjustable field-of-view (FOV). The adjustable FOV has at least two size designations in response to an FOV size request input. The control connected to the RF coil assembly is capable of switching between the FOV size designations by switching power to activate a center coil alone or the center coil in conjunction with the end coils in unison.

摘要翻译： 提供了一种用于在图像重建期间减少包裹伪像的MRI装置和方法。 RF线圈和控制配置包括中心线圈和至少一对端RF线圈，其被配置成在可调节视场（FOV）上编码和激励自旋。 响应于FOV尺寸请求输入，可调FOV具有至少两个尺寸的名称。 连接到RF线圈组件的控制能够通过开关功率在FOV尺寸指定之间切换，以一致地激活中心线圈或中心线圈，同时结合端部线圈。

公开(公告)号：US07688070B2

公开(公告)日：2010-03-30

申请号：US10707045

申请日：2003-11-18

申请人： Daniel J. Weyers ,  David Keren ,  Kevin Kinsey ,  Ed B. Boskamp

发明人： Daniel J. Weyers ,  David Keren ,  Kevin Kinsey ,  Ed B. Boskamp

IPC分类号： G01V3/00

CPC分类号： G01R33/34046

摘要： An imaging coil (12) includes multiple end rings (52). A center ring (53) extends parallel to and is coupled between the end rings (52). Multiple legs (86) are coupled between the end rings (52) and the center ring (53). The end rings (52) may have a first radius (R1) that is greater than a second radius (R2) of the center ring (53). The imaging coil (12) may include more than 16 legs. The imaging coil (12) may include multiple capacitor groupings (98) coupled along the end rings (52), each capacitor grouping (98) has multiple capacitors (102) with a coverage area width (W) greater than 5.0 cm. The center ring (53) may be coupled to a ground reference (110) and has low impedance such that the center ring (53) is effectively shorted to the ground reference (110).

摘要翻译： 成像线圈（12）包括多个端环（52）。 中心环（53）平行于并连接在端环（52）之间延伸。 多个支腿（86）联接在端环（52）和中心环（53）之间。 端环（52）可以具有大于中心环（53）的第二半径（R2）的第一半径（R1）。 成像线圈（12）可以包括多于16条腿。 成像线圈（12）可以包括沿着端环（52）耦合的多个电容器分组（98），每个电容器分组（98）具有覆盖区域宽度（W）大于5.0cm的多个电容器（102）。 中心环（53）可以耦合到接地基准（110）并且具有低阻抗，使得中心环（53）有效地短路到接地基准（110）。

公开(公告)号：US07081752B2

公开(公告)日：2006-07-25

申请号：US10249390

申请日：2003-04-04

申请人： Timothy W. Skloss ,  Dewain A. Purgill ,  Roman I. Dachniwskyj ,  Daniel J. Schaefer ,  Steven C. Davis ,  Daniel J. Weyers

发明人： Timothy W. Skloss ,  Dewain A. Purgill ,  Roman I. Dachniwskyj ,  Daniel J. Schaefer ,  Steven C. Davis ,  Daniel J. Weyers

IPC分类号： G01V3/00

CPC分类号： G01R33/58

摘要： A system and method including an apparatus for use in electrically loading RF coils of an MRI system is disclosed. The apparatus includes a polymer interdispersed with an electrically conductive additive such that the apparatus provides the necessary electrical loading of the RF coils for testing and calibration of the MRI system but is free of liquid. Furthermore, the apparatus is capable of providing the requisite electrical load in high magnet magnetic fields without introducing image distortion as a result of standing waves within the apparatus.

摘要翻译： 公开了一种包括用于电加载MRI系统的RF线圈的装置的系统和方法。 该装置包括分散有导电添加剂的聚合物，使得该装置提供RF线圈的必要电负载，用于MRI系统的测试和校准，但是不含液体。 此外，该装置能够在高磁场磁场中提供必要的电负载，而不会由于装置内的驻波而引入图像失真。

公开(公告)号：US06608480B1

公开(公告)日：2003-08-19

申请号：US10260603

申请日：2002-09-30

申请人： Daniel J. Weyers

发明人： Daniel J. Weyers

IPC分类号： G01V300

CPC分类号： G01R33/3415

摘要： The present invention provides for a body coil modeled after a birdcage coil and based on a ladder network design. A fixed number of single loop coils (N) are equally spaced around a cylinder. These coils must be driven 360°/N out of phase with respect to each other azimuthally. Each phase must increase 360°/N as azimuthally in order for single loop coil currents to mimic currents commonly seen in the quadrature birdcage coil. A switching circuit is necessary to change the transmit coil configuration and the N channel for phased array reception. This type of coil eliminates the otherwise necessary need to decouple the transmit coil from the receiver coils, but preserves the SNR benefit of having multiple receiver coils. This type of coil will improve SNR over ordinary volume coils and may be necessary imaging large patients where space around the patient is at a minimum.

摘要翻译： 本发明提供一种建立在鸟笼线圈之后并且基于梯形网络设计的身体线圈。 固定数量的单环线圈（N）围绕圆筒等间隔。 这些线圈必须相对于方位角360°/ N异相驱动。 每个相位必须以方位角增加360°/ N，以使单环线圈电流模拟正交鸟笼线圈中常见的电流。 需要切换电路来改变发射线圈配置和用于相控阵列接收的N通道。 这种类型的线圈消除了将发射线圈与接收器线圈分离的另外必要的需要，但是保留具有多个接收器线圈的SNR益处。 这种类型的线圈将改善比普通体积线圈的SNR，并且可能需要对患者周围空间最小的大型患者进行成像。