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    Super shielding of finite length structures in open magnetic and electric systems
    1.
    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
    2.
    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）。

    Head coil arrays for parallel imaging in magnetic resonance imaging
    5.
    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。

    Crossed-ladder RF coils for vertical field MRI systems
    6.
    发明授权
    Crossed-ladder RF coils for vertical field MRI systems 失效
    用于垂直场MRI系统的交叉梯形RF线圈

    公开(公告)号：US06441615B1

    公开(公告)日：2002-08-27

    申请号：US09473072

    申请日：1999-12-28

    申请人： Hiroyuki Fujita ,  Gordon D. DeMeester ,  Michael A. Morich

    发明人： Hiroyuki Fujita ,  Gordon D. DeMeester ,  Michael A. Morich

    IPC分类号： G01V300

    CPC分类号： G01R33/3415 ,  G01R33/34 ,  G01R33/34061

    摘要： A crossed-ladder RF coil assembly (48) is employed for quadrature excitation and/or reception in an open or vertical field magnetic resonance apparatus. The RF coil assembly (48, 70, 90) includes a pair of coil assemblies (50, 52; 70, 72; 100, 102) which are disposed in a parallel relationship. Coil arrays (50, 52; 100, 102) include at least two ladder RF coils (501, 502, 503; 521, 522, 523; 1001 . . . , 1008; 1021, . . . , 1028) which are disposed in an overlapping relationship and are rotated by 90° relative to one another. Each ladder RF coil of one coil array is rotated by 90° relative to adjoining ladder coils and each corresponding ladder RF coil of the other coil array. The crossed-ladder RF coil assembly provides better B1 field uniformity and elongated anatomical coverage for spine and neck imaging. In addition, the RF coil assembly reduces noise from the body at higher fields in vertical field magnetic resonance systems.

    摘要翻译： 交叉梯形RF线圈组件（48）用于开放或垂直场磁共振装置中的正交激励和/或接收。 RF线圈组件（48,70,90）包括以平行关系设置的一对线圈组件（50,52; 70,72; 100,102）。 线圈阵列（50,52; 100,102）包括至少两个梯形RF线圈（501,502,503; 521,522,523; 1001 ... 1008; 1021，...，1028） 重叠关系并相对于彼此旋转90°。 一个线圈阵列的每个梯形RF线圈相对于邻接的梯形线圈和另一个线圈阵列的每个对应的梯形RF线圈旋转90°。 交叉梯形RF线圈组件为脊柱和颈部成像提供更好的B1场均匀性和细长的解剖学覆盖。 此外，RF线圈组件在垂直场磁共振系统中在较高场中减少来自身体的噪声。

    Flexible open quadrature highpass ladder structure RF surface coil in magnetic resonance imaging
    7.
    发明授权
    Flexible open quadrature highpass ladder structure RF surface coil in magnetic resonance imaging 失效
    磁共振成像中的柔性开放正交高通梯结构RF表面线圈

    公开(公告)号：US06169401A

    公开(公告)日：2001-01-02

    申请号：US09200168

    申请日：1998-11-25

    申请人： Hiroyuki Fujita ,  Michael Burl ,  Michael A. Morich

    发明人： Hiroyuki Fujita ,  Michael Burl ,  Michael A. Morich

    IPC分类号： G01V300

    CPC分类号： G01R33/3678

    摘要： A magnetic imaging apparatus generates a main magnetic field longitudinally through an image region and excites magnetic resonance in selected nuclei in a patient or subject disposed in the image area. The resonating nuclei generate radio frequency magnetic resonance signals which are received by a quadrature highpass ladder surface coil (D). The highpass ladder coil includes a central leg 34 having a capacitive element Cv disposed symmetrically about a midpoint 44. A like number of additional legs 30, 32, 36, 38 are disposed parallel to and symmetrically on opposite side of the central leg. Side elements 40, 42 include capacitive elements CA which interconnect adjacent ends of each of the legs. The capacitive elements are disposed symmetrically about the midpoint 44 and are selected such that the coil supports at least two intrinsic resonant modes including an odd mode 50 and an even mode 52. The even mode is sensitive to fields in the plane of the coil and the odd mode is sensitive to fields in a plane orthogonal to the coil.

    摘要翻译： 磁性成像装置通过图像区域纵向地产生主磁场，并且在设置在图像区域中的患者或对象中的选定细胞核中激发磁共振。 谐振核产生由正交高通梯面线圈（D）接收的射频磁共振信号。 高通梯形线圈包括具有围绕中点44对称设置的电容元件Cv的中心支腿34.相似数量的附加支脚30,32,36,38平行于对称地设置在中心支线的相对侧上。 侧面元件40,42包括互连每个腿的相邻端部的电容元件CA。 电容元件围绕中点44对称地设置，并且被选择为使得线圈支持包括奇数模式50和偶模式52的至少两个本征谐振模式。偶模对线圈的平面中的场敏感，并且 奇数模式对垂直于线圈的平面中的场敏感。

    Wireless communication apparatus having wireless communication functions conforming to incompatible communication standards
    9.
    发明授权
    Wireless communication apparatus having wireless communication functions conforming to incompatible communication standards 失效
    具有符合不兼容通信标准的无线通信功能的无线通信装置

    公开(公告)号：US08005504B2

    公开(公告)日：2011-08-23

    申请号：US11560170

    申请日：2006-11-15

    申请人： Eiichi Sano ,  Hiroyuki Fujita

    发明人： Eiichi Sano ,  Hiroyuki Fujita

    IPC分类号： H04M1/00

    CPC分类号： H04W52/42 ,  H04B7/0602 ,  H04B7/0805 ,  H04B7/0825 ,  H04M2250/02 ,  H04M2250/06

    摘要： A wireless communication apparatus is provided. The wireless communication apparatus includes wireless communication functions conforming to incompatible first and second communication standards. The wireless communication apparatus includes a first transceiver that performs a wireless communication operation conforming to the first communication standard and includes a first transmission/reception port, a second transceiver that performs a wireless communication operation conforming to the second communication standard and includes a second transmission/reception port, a shared antenna shared by the first and the second transceivers, an antenna connecting unit that connects the shared antenna and the first and the second transmission/reception ports, and a control unit that controls the communication operations in the first and the second transceivers.

    摘要翻译： 提供一种无线通信装置。 无线通信装置包括符合不兼容的第一和第二通信标准的无线通信功能。 无线通信装置包括执行符合第一通信标准的无线通信操作的第一收发器，并且包括第一发送/接收端口，执行符合第二通信标准的无线通信操作的第二收发器，并且包括第二发送/ 接收端口，由第一和第二收发器共享的共享天线，连接共享天线与第一和第二发送/接收端口的天线连接单元，以及控制单元，其控制第一和第二收发器中的通信操作 收发器