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22 条记录 (耗时 0.039 秒)

    Head coil arrays for parallel imaging in magnetic resonance imaging
    3.
    发明授权
    Head coil arrays for parallel imaging in magnetic resonance imaging 有权
    用于磁共振成像中的并行成像的头部线圈阵列

    公开(公告)号：US06930480B1

    公开(公告)日：2005-08-16

    申请号：US10187353

    申请日：2002-06-28

    申请人： Hiroyuki Fujita ,  Labros S. Petropoulos ,  Mark Xueming Zou ,  Pei H. Chan ,  Dashen Chu ,  Joseph Murphy-Boesch

    发明人： Hiroyuki Fujita ,  Labros S. Petropoulos ,  Mark Xueming Zou ,  Pei H. Chan ,  Dashen Chu ,  Joseph Murphy-Boesch

    IPC分类号： G01R33/34 ,  G01R33/561 ,  G01V3/00

    CPC分类号： G01R33/34046 ,  G01R33/5611

    摘要： A partially parallel acquisition RF coil array for imaging a human head includes at least a first, a second and a third loop coil adapted to be arranged circumambiently about the lower portion of the head; and at least a forth, a fifth and a sixth coil adapted to be conformably arranged about the summit of the head. A partially parallel acquisition RF coil array for imaging a human head includes at least a first, a second, a third and a fourth loop coil adapted to be arranged circumambiently about the lower portion of the head; and at least a first and a second Figure-8 or saddle coil adapted to be conformably arranged about the summit of the head.

    摘要翻译： 用于对人头进行成像的部分并行采集RF线圈阵列包括至少第一，第二和第三环形线圈，其适于围绕头部的下部周边布置; 以及适于围绕头部的顶点顺应地布置的至少一个第四，第五和第六线圈。 用于对人头进行成像的部分并行采集RF线圈阵列包括至少第一，第二，第三和第四环形线圈，其适于围绕头部的下部周边布置; 以及至少第一和第二图8或鞍形线圈，其适于围绕头部的顶点顺应地布置。

    Magnetic resonance imaging array coil system and method for breast imaging
    6.
    发明授权
    Magnetic resonance imaging array coil system and method for breast imaging 有权
    磁共振成像阵列线圈系统及乳腺成像方法

    公开(公告)号：US07084631B2

    公开(公告)日：2006-08-01

    申请号：US10846783

    申请日：2004-05-14

    申请人： Kun Qu ,  Pei H. Chan ,  Tsinghua Zheng ,  Joseph Murphy-Boesch ,  Labros S. Petropoulos

    发明人： Kun Qu ,  Pei H. Chan ,  Tsinghua Zheng ,  Joseph Murphy-Boesch ,  Labros S. Petropoulos

    IPC分类号： G01V3/00

    CPC分类号： G01R33/3415

    摘要： A magnetic resonance imaging (MRI) array coil system and method for breast imaging are provided. The MRI array coil system includes a top coil portion with two openings configured to receive therethrough objects to be imaged. The MRI array coil system further includes a bottom coil portion having two openings configured to access from sides of the bottom coil portion the objects to be imaged. The top coil portion and bottom coil portion each have a plurality of coil elements configured to provide parallel imaging.

    摘要翻译： 提供了磁共振成像（MRI）阵列线圈系统和乳房成像方法。 MRI阵列线圈系统包括具有两个开口的顶部线圈部分，其被配置为接收要成像的对象。 MRI阵列线圈系统还包括底部线圈部分，其具有被配置为从底部线圈部分的侧面进入待成像对象的两个开口。 顶部线圈部分和底部线圈部分各自具有被配置为提供平行成像的多个线圈元件。

    Asymmetric ring dome radio frequency coil
    7.
    发明授权
    Asymmetric ring dome radio frequency coil 有权
    非对称环形无线电频率线圈

    公开(公告)号：US06788058B1

    公开(公告)日：2004-09-07

    申请号：US10094378

    申请日：2002-03-08

    申请人： Labros S. Petropoulos ,  Joseph Murphy-Boesch ,  Keith Richmond

    发明人： Labros S. Petropoulos ,  Joseph Murphy-Boesch ,  Keith Richmond

    IPC分类号： G01V300

    CPC分类号： G01R33/34046

    摘要： A MRI coil having an axis and a first end and an opposite second end with respect to said axis includes a first ring element at the first end, a second ring element, a third ring element, a fourth ring element at the second end where the first ring element encompasses a smaller area than each of the second, third, and fourth ring elements. The coil also includes a plurality of axial elements connected between the first, second, third and fourth ring elements. The third and fourth ring elements are axially closer than the first and second ring elements.

    摘要翻译： 具有轴线和第一端以及相对于所述轴线相对的第二端的MRI线圈包括在第一端处的第一环形元件，第二环形元件，第三环形元件，第二端部处的第四环形元件， 第一环形元件包括比第二，第三和第四环形元件中的每一个更小的面积。 线圈还包括连接在第一，第二，第三和第四环形元件之间的多个轴向元件。 第三和第四环形元件比第一和第二环形元件轴向更靠近。

    Super shielding of finite length structures in open magnetic and electric systems
    8.
    发明授权
    Super shielding of finite length structures in open magnetic and electric systems 失效
    开放式磁力和电气系统中有限长度结构的超级屏蔽

    公开(公告)号：US06236203B1

    公开(公告)日：2001-05-22

    申请号：US09162005

    申请日：1998-09-28

    申请人： Shmaryu M. Shvartsman ,  Robert W. Brown ,  Hiroyuki Fujita ,  Michael A. Morich ,  Labros S. Petropoulos

    发明人： Shmaryu M. Shvartsman ,  Robert W. Brown ,  Hiroyuki Fujita ,  Michael A. Morich ,  Labros S. Petropoulos

    IPC分类号： G01R3320

    CPC分类号： G01R33/4215

    摘要： Methods of designing an active shield for substantially zeroing an electro-magnetic field on one side of a predetermined boundary in open magnetic resonance imaging systems and in open electric systems are provided. The methods include defining a finite length geometry for a primary structure which, in the case of zeroing a magnetic field, carries a first current distribution on its surface. A finite length geometry is also defined for a secondary structure which, in the case of zeroing a magnetic field, carries a second current distribution on its surface. In the case of zeroing an electric field, the current distributions are replaced with charge distributions. A total magnetic or electric field resulting from a combination of the first and second current or charge distributions respectively is constrained such that normal components (in the magnetic field case) or tangential components (in the electric field case) thereof substantially vanish at the surface of one of the primary and secondary structures. The first current or charge distribution is constrained to the surface of the primary structure, and the second current or charge distribution is constrained to the surface of the secondary structure. The first and second current or charge distributions are then calculated concurrently allowing both the first and second current or charge distributions to vary while observing the constraints such that a predetermined magnetic or electric field is achieved in a first region and a magnetic or electric field on one side of a predetermined boundary is substantially zeroed.

    摘要翻译： 提供了在开放式磁共振成像系统和开放式电气系统中设计用于使预定边界的一侧上的电磁场基本归零的有源屏蔽的方法。 这些方法包括为初级结构定义有限长几何形状，在使磁场归零的情况下，其在其表面上承载第一电流分布。 还对二次结构定义了有限长几何形状，在二次结构的归零的情况下，在其表面上承载第二电流分布。 在电场归零的情况下，电流分布被电荷分布替代。 分别由第一和第二电流或电荷分布的组合产生的总磁场或电场被约束，使得正常分量（在磁场情况下）或切向分量（在电场情况下）基本上消失在 主要和次要结构之一。 第一电流或电荷分布被约束到初级结构的表面，并且第二电流或电荷分布被约束到二级结构的表面。 然后同时计算第一和第二电流或电荷分布，同时允许第一和第二电流或电荷分布同时观察约束，使得在第一区域中实现预定的磁场或电场，并且在一个区域上实现磁场或电场 预定边界的一侧基本为零。

    Technique for designing distributed radio frequency coils and distributed radio frequency coils designed thereby
    9.
    发明授权
    Technique for designing distributed radio frequency coils and distributed radio frequency coils designed thereby 失效
    用于设计分布式射频线圈和由此设计的分布式射频线圈的技术

    公开(公告)号：US5689189A

    公开(公告)日：1997-11-18

    申请号：US638203

    申请日：1996-04-26

    申请人： Michael A. Morich ,  Labros S. Petropoulos ,  Hiroyuki Fujita ,  Shmaryu Shvartsman ,  Robert W. Brown

    发明人： Michael A. Morich ,  Labros S. Petropoulos ,  Hiroyuki Fujita ,  Shmaryu Shvartsman ,  Robert W. Brown

    IPC分类号： A61B5/055 ,  G01R33/34 ,  G01V3/00

    CPC分类号： G01R33/341

    摘要： A localized coil (30) is disposed in the temporally constant magnetic field of a magnetic resonance imaging system. The localized coil is designed in five steps: a static problem formulation step, a static current solution step, a discretization step, a current loop connection step, and a high frequency solution step. One radio frequency coil designed by this process to be carried on a circularly cylindrical former includes two coil sections (60, 62) disposed on opposite sides of the dielectric former. Each of the two coil sections includes a pair of inner loops (64.sub.1, 64.sub.2) disposed symmetrically relative to a z=0 plane of symmetry and a second pair of loops (68.sub.1, 68.sub.2) also disposed symmetrically about the plane of symmetry. To raise self-resonance frequency, the inner and outer loops are connected in parallel. The resonance frequency is fine-tuned with reactive elements (66.sub.1, 66.sub.2). To ensure balanced current flow between the two coil portions, the two portions are connected (78) in parallel.

    摘要翻译： 局部线圈（30）设置在磁共振成像系统的时间上恒定的磁场中。 局部线圈设计有五个步骤：静态问题制定步骤，静态电流解决步骤，离散化步骤，电流环路连接步骤和高频解决步骤。 通过该工艺设计的一个射频线圈被承载在圆柱形成形器上，包括设置在电介体的相对侧上的两个线圈部分（60,62）。 两个线圈段中的每一个包括一对相对于z = 0对称平面对称设置的内环（641,642），以及也围绕对称平面对称设置的第二对环（681,682）。 为了提高自谐振频率，内环和外环并联。 谐振频率与无功元件（661,662）进行微调。 为了确保两个线圈部分之间的平衡电流流动，两个部分平行连接（78）。

    Double-duty gradient coil assembly having two primary gradient coil sets and a common screening coil set
    10.
    发明授权
    Double-duty gradient coil assembly having two primary gradient coil sets and a common screening coil set 失效
    具有两个主梯度线圈组和普通筛选线圈组的双重梯度线圈组件

    公开(公告)号：US6049207A

    公开(公告)日：2000-04-11

    申请号：US200659

    申请日：1998-11-25

    申请人： Labros S. Petropoulos

    发明人： Labros S. Petropoulos

    IPC分类号： A61B5/055 ,  G01R33/421 ,  G01V3/00

    CPC分类号： G01R33/4215 ,  G01R33/421

    摘要： A method of designing a shielded gradient coil assembly (22) for magnetic resonance imaging systems is provided. The gradient coil structure comprises two sets of primary gradient coils (60, 62) and a single set of a shielded (screening) coils (64). This configuration is suitable for MR applications utilizing a double duty gradient configuration including a high-efficiency primary coil set that enhances the performance of ultra fast MR sequencing while minimizing the dB/dt and eddy current effects, and including a low-efficiency primary coil set having a high-quality gradient field that is suitable for conventional imaging applications with inherently low dB/dt and eddy current levels. In addition, a minimum inductance/energy algorithm assists in the design of the two primary and the one secondary gradient sets.

    摘要翻译： 提供了一种设计用于磁共振成像系统的屏蔽梯度线圈组件（22）的方法。 梯度线圈结构包括两组初级梯度线圈（60,62）和一组屏蔽（屏蔽）线圈（64）。 该配置适用于利用双重占空比梯度配置的MR应用，包括高效率初级线圈组，其提高超快速MR测序的性能，同时最小化dB / dt和涡流效应，并且包括低效率初级线圈组 具有高质量的梯度场，适用于具有固有的低dB / dt和涡流电平的传统成像应用。 此外，最小电感/能量算法有助于两个主要和一个二次梯度集的设计。