公开(公告)号：US09599685B2

公开(公告)日：2017-03-21

申请号：US13877702

申请日：2011-10-06

申请人： Hideta Habara ,  Yoshitaka Bito ,  Hisaaki Ochi ,  Yoshihisa Soutome ,  Masayoshi Dohata ,  Tetsuhiko Takahashi ,  Hiroyuki Takeuchi

发明人： Hideta Habara ,  Yoshitaka Bito ,  Hisaaki Ochi ,  Yoshihisa Soutome ,  Masayoshi Dohata ,  Tetsuhiko Takahashi ,  Hiroyuki Takeuchi

IPC分类号： G01R33/34 ,  G01R33/345 ,  H01Q9/06 ,  H01Q21/20 ,  G01R33/28 ,  G01R33/36 ,  G01R33/422

CPC分类号： G01R33/34092 ,  G01R33/288 ,  G01R33/34046 ,  G01R33/3456 ,  G01R33/3657 ,  G01R33/422 ,  H01Q9/065 ,  H01Q21/20

摘要： There is provided a technique for suppressing increase of SAR without sacrificing sensitivity in RF coils used in MRI apparatuses. The present invention provides an antenna device comprising a sheet-shaped conductor and a ribbon-shaped conductor disposed on the subject side with respect to the sheet-shaped conductor with a predetermined distance from the sheet-shaped conductor. The ribbon-shaped conductor has a meandering shape, and is adjusted so as to resonate at transmission and reception frequencies, and it is constituted so that distance to the sheet-shaped conductor becomes smaller at both end part thereof along the static magnetic field direction compared with the distance to the sheet-shaped conductor at the center thereof. Moreover, the ribbon-shaped conductor is constituted so as to have a smaller width, as the distance to the sheet-shaped conductor becomes smaller.

公开(公告)号：US09182468B2

公开(公告)日：2015-11-10

申请号：US13577241

申请日：2011-01-26

申请人： Yukio Kaneko ,  Hideta Habara ,  Yoshihisa Soutome ,  Yosuke Otake ,  Hisaaki Ochi ,  Yoshitaka Bito

发明人： Yukio Kaneko ,  Hideta Habara ,  Yoshihisa Soutome ,  Yosuke Otake ,  Hisaaki Ochi ,  Yoshitaka Bito

IPC分类号： G01R33/565 ,  G01R33/34 ,  G01R33/3415 ,  G01R33/36

CPC分类号： G01R33/5659 ,  G01R33/34076 ,  G01R33/3415 ,  G01R33/3657 ,  G01R33/3664 ,  G01R33/3678

摘要： There is provided a technique for improving quality of images obtained with an MRI apparatus by using the geometric structures of the conventional RF transmission coil and RF reception coil and without increasing burden on patients or MRI technicians. A conductor loop of an RF reception coil disposed between a subject and an RF transmission coil is used also as a loop for magnetic field adjustment in order to shield or enhance a rotating magnetic field B1 generated by the RF transmission coil. Further, the conductor loop operated as a conductor loop for magnetic field adjustment among the conductor loops constituting the RF reception coil is driven so that inhomogeneity of the rotating magnetic field B1 is reduced.

摘要翻译： 提供了一种通过使用常规RF传输线圈和RF接收线圈的几何结构来提高使用MRI装置获得的图像质量并且不增加患者或MRI技术人员负担的技术。 设置在被检体和RF传输线圈之间的RF接收线圈的导体环也用作用于磁场调整的环路，以便屏蔽或增强由RF传输线圈产生的旋转磁场B1。 此外，作为构成RF接收线圈的导体环路之间用于磁场调整的导体回路的导体回路被驱动，使得旋转磁场B1的不均匀性降低。

公开(公告)号：US20130221968A1

公开(公告)日：2013-08-29

申请号：US13877702

申请日：2011-10-06

申请人： Hideta Habara ,  Yoshitaka Bito ,  Hisaaki Ochi ,  Yoshihisa Soutome ,  Masayoshi Dohata ,  Tetsuhiko Takahashi ,  Hiroyuki Takeuchi

发明人： Hideta Habara ,  Yoshitaka Bito ,  Hisaaki Ochi ,  Yoshihisa Soutome ,  Masayoshi Dohata ,  Tetsuhiko Takahashi ,  Hiroyuki Takeuchi

IPC分类号： G01R33/34

CPC分类号： G01R33/34092 ,  G01R33/288 ,  G01R33/34046 ,  G01R33/3456 ,  G01R33/3657 ,  G01R33/422 ,  H01Q9/065 ,  H01Q21/20

摘要： There is provided a technique for suppressing increase of SAR without sacrificing sensitivity in RF coils used in MRI apparatuses. The present invention provides an antenna device comprising a sheet-shaped conductor and a ribbon-shaped conductor disposed on the subject side with respect to the sheet-shaped conductor with a predetermined distance from the sheet-shaped conductor. The ribbon-shaped conductor has a meandering shape, and is adjusted so as to resonate at transmission and reception frequencies, and it is constituted so that distance to the sheet-shaped conductor becomes smaller at both end part thereof along the static magnetic field direction compared with the distance to the sheet-shaped conductor at the center thereof. Moreover, the ribbon-shaped conductor is constituted so as to have a smaller width, as the distance to the sheet-shaped conductor becomes smaller.

摘要翻译： 提供了抑制SAR增加的技术，而不牺牲MRI装置中使用的RF线圈的灵敏度。 本发明提供了一种天线装置，其包括片状导体和布置在与片状导体相距预定距离的片状导体的被检体侧的带状导体。 带状导体具有曲折形状，并且被调整为在发送和接收频率下谐振，并且其构造成使得沿着静磁场方向在其两端部处的与片状导体的距离变小 与其中心的片状导体的距离。 此外，随着与片状导体的距离变小，带状导体构成为具有较小的宽度。

公开(公告)号：US20110121834A1

公开(公告)日：2011-05-26

申请号：US13054474

申请日：2009-07-22

申请人： Yoshihisa Soutome ,  Hideta Habara ,  Yoshitaka Bito

发明人： Yoshihisa Soutome ,  Hideta Habara ,  Yoshitaka Bito

IPC分类号： G01R33/44

CPC分类号： G01R33/365 ,  G01R33/3415 ,  G01R33/3657

摘要： There is provided a high-frequency coil of an MRI device, which can easily and highly reproducibly reduce electromagnetic coupling between adjacent surface coils among a plurality of surface coils disposed with intervals. An electromagnetic decoupling coil that can generate a magnetic flux for canceling a magnetic flux generated by one of the adjacent surface coils and interlinking with the other surface coil is disposed between the adjacent surface coils. The electromagnetic decoupling coil is provided with a capacitor, and is tuned by means of the capacitor so that the electromagnetic coupling should be minimized in such a range that the resonance frequency thereof should be lower than the resonance frequency of the surface coils.

摘要翻译： 提供了一种MRI装置的高频线圈，其可以容易且高度可重复地减少间隔设置的多个表面线圈中的相邻表面线圈之间的电磁耦合。 可以在相邻的表面线圈之间设置电磁去耦线圈，该电磁去耦线圈可以产生用于消除由相邻的表面线圈之一产生的磁通并与另一个表面线圈相互连接的磁通量。 电磁去耦线圈设置有电容器，并通过电容器进行调谐，使得电磁耦合应在其共振频率应低于表面线圈的谐振频率的范围内最小化。

公开(公告)号：US09541614B2

公开(公告)日：2017-01-10

申请号：US14001221

申请日：2012-04-06

申请人： Yoshihisa Soutome ,  Yoshitaka Bito ,  Hideta Habara

发明人： Yoshihisa Soutome ,  Yoshitaka Bito ,  Hideta Habara

IPC分类号： G01R33/34 ,  A61B5/055

CPC分类号： G01R33/34 ,  A61B5/055 ,  G01R33/34076

摘要： The present invention is directed to an elliptical birdcage coil which reduces time and effort upon manufacturing and production cost, with less variations in performance. There is provided a high frequency coil unit made up of the elliptical birdcage coil having plural capacitors arranged at least on either of the ring conductors and the rung conductors, the capacitance of the plural capacitors being uniform with respect to each conductor type on which the capacitors are placed. In this elliptical birdcage coil, a value of inductance and arrangement of the ring conductors and the rung conductors are determined in such a manner that the capacitance of the capacitors becomes identical with respect to each conductor type on which the capacitors are arranged.

摘要翻译： 本发明涉及椭圆形鸟笼线圈，其减少制造时的时间和精力以及生产成本，性能变化较小。 提供了一种高频线圈单元，其由椭圆形的鸟笼线圈构成，具有至少布置在任一个环形导体和梯形导体上的多个电容器，多个电容器的电容相对于其上的电容器 摆放在。 在该椭圆形的鸟笼线圈中，以这样一种方式确定环形导体和梯形导体的电感和布置值，使得电容器的电容相对于其上布置有电容器的每种导体类型相同。

公开(公告)号：US20140103931A1

公开(公告)日：2014-04-17

申请号：US14001221

申请日：2012-04-06

申请人： Yoshihisa Soutome ,  Yoshitaka Bito ,  Hideta Habara

发明人： Yoshihisa Soutome ,  Yoshitaka Bito ,  Hideta Habara

IPC分类号： G01R33/34

CPC分类号： G01R33/34 ,  A61B5/055 ,  G01R33/34076

摘要： The present invention is directed to an elliptical birdcage coil which reduces time and effort upon manufacturing and production cost, with less variations in performance. There is provided a high frequency coil unit made up of the elliptical birdcage coil having plural capacitors arranged at least on either of the ring conductors and the rung conductors, the capacitance of the plural capacitors being uniform with respect to each conductor type on which the capacitors are placed. In this elliptical birdcage coil, a value of inductance and arrangement of the ring conductors and the rung conductors are determined in such a manner that the capacitance of the capacitors becomes identical with respect to each conductor type on which the capacitors are arranged.

摘要翻译： 本发明涉及椭圆形鸟笼线圈，其减少制造时的时间和精力以及生产成本，性能变化较小。 提供了一种高频线圈单元，其由椭圆形的鸟笼线圈构成，具有至少布置在任一个环形导体和梯形导体上的多个电容器，多个电容器的电容相对于其上的电容器 摆放在。 在该椭圆形的鸟笼线圈中，以这样一种方式确定环形导体和梯形导体的电感和布置值，使得电容器的电容相对于其上布置有电容器的每种导体类型相同。

公开(公告)号：US07884609B2

公开(公告)日：2011-02-08

申请号：US12071899

申请日：2008-02-27

申请人： Yoshihisa Soutome ,  Hideta Habara ,  Yoshitaka Bito

发明人： Yoshihisa Soutome ,  Hideta Habara ,  Yoshitaka Bito

IPC分类号： G01V3/00

CPC分类号： G01R33/34046 ,  G01R33/34007 ,  G01R33/34076 ,  G01R33/3415 ,  G01R33/3628 ,  G01R33/365 ,  G01R33/3657 ,  G01R33/3678

摘要： To provide an RF coil of an MRI apparatus and improve the irradiation efficiency and the reception sensitivity of a circular polarized magnetic field with a simple structure.An RF coil has a set of input/output terminals and two loops. The two loops are disposed and capacitors in the loops are adjusted so that the linearly polarized magnetic fields generated and detected by the loops are perpendicular to each other, and the combined magnetic field of the linearly polarized magnetic fields is a circular polarized magnetic field.

摘要翻译： 提供MRI装置的RF线圈，并以简单的结构提高圆偏振磁场的照射效率和接收灵敏度。 RF线圈具有一组输入/输出端子和两个回路。 设置两个环路，并调整环路中的电容器，使得由环路产生和检测的线性极化磁场彼此垂直，并且线性极化磁场的组合磁场是圆极化磁场。

公开(公告)号：US09726744B2

公开(公告)日：2017-08-08

申请号：US14241515

申请日：2012-07-27

申请人： Yukio Kaneko ,  Yoshihisa Soutome ,  Yoshitaka Bito ,  Hiroyuki Takeuchi ,  Tetsuhiko Takahashi ,  Hideta Habara ,  Yosuke Otake

发明人： Yukio Kaneko ,  Yoshihisa Soutome ,  Yoshitaka Bito ,  Hiroyuki Takeuchi ,  Tetsuhiko Takahashi ,  Hideta Habara ,  Yosuke Otake

IPC分类号： G01R33/565 ,  G01R33/24 ,  A61B5/055 ,  G01R33/483 ,  G01R33/561

CPC分类号： G01R33/5659 ,  A61B5/055 ,  G01R33/246 ,  G01R33/4835 ,  G01R33/5612

摘要： Systems and methods for magnetic resonance imaging, including adjusting spatial distribution of a rotating magnetic field. By minimizing imaging time, the B1 nonuniformity reducing effect of RF shimming is maximized for an imaging section of an arbitrary axis direction and an arbitrary position. B1 distributions are measured for only several sections of one predetermined direction, and a radio frequency magnetic field condition that maximizes the B1 non-uniformity reducing effect for an imaging section of an arbitrary direction and an arbitrary position is calculated from the B1 distribution data.

公开(公告)号：US09638771B2

公开(公告)日：2017-05-02

申请号：US13811979

申请日：2011-07-25

申请人： Yoshihisa Soutome ,  Yoshitaka Bito ,  Hiroyuki Takeuchi ,  Tetsuhiko Takahashi ,  Hisaaki Ochi ,  Hideta Habara

发明人： Yoshihisa Soutome ,  Yoshitaka Bito ,  Hiroyuki Takeuchi ,  Tetsuhiko Takahashi ,  Hisaaki Ochi ,  Hideta Habara

IPC分类号： G01R33/34 ,  A61B5/055 ,  G01R33/345 ,  G01R33/36 ,  G01R33/422

CPC分类号： G01R33/34 ,  A61B5/055 ,  G01R33/34046 ,  G01R33/34084 ,  G01R33/3453 ,  G01R33/365 ,  G01R33/3657 ,  G01R33/3678 ,  G01R33/422

摘要： A technique is provided to reserve large examination space in the tunnel type MRI apparatus, without increasing production cost nor reducing significantly irradiation efficiency and homogeneity in an irradiation distribution within an imaging region. The present invention provides an RF coil unit in which four partial cylindrical coils are placed with a gap therebetween in the circumferential direction inside a cylindrical RF shield, in such a manner that two pairs of the partial cylindrical coils are opposed to each other, and magnetic fields produced by the individual partial cylindrical coils are combined, thereby producing a circularly polarized wave field or an elliptically polarized wave field. The partial cylindrical coil is provided with a partial cylindrical conductor, multiple first conductors substantially parallel with the central axis of the RF shield, multiple capacitors connecting both ends of the first conductors with the partial cylindrical conductor, and a second conductor adjacent to at least one of the ends of the first conductor. The partial cylindrical coils are respectively provided with high frequency signals having a desired amplitude ratio and phase difference, while a reference frequency thereof being identical.

公开(公告)号：US08648597B2

公开(公告)日：2014-02-11

申请号：US12702666

申请日：2010-02-09

申请人： Hideta Habara ,  Yoshitaka Bito ,  Hisaaki Ochi ,  Yoshihisa Soutome ,  Masayoshi Dohata ,  Tetsuhiko Takahashi ,  Hiroyuki Takeuchi

发明人： Hideta Habara ,  Yoshitaka Bito ,  Hisaaki Ochi ,  Yoshihisa Soutome ,  Masayoshi Dohata ,  Tetsuhiko Takahashi ,  Hiroyuki Takeuchi

IPC分类号： G01R33/34

CPC分类号： G01R33/3456

摘要： An RF coil is provided with a hollow-shaped outer conductive element and strip-shaped conductive elements disposed along the outer conductive element in the axial direction. The strip-shaped conductive elements are disposed with uneven intervals to secure an internal space at a position where the strip-shaped conductive elements are not disposed. In order to obtain uniform sensitivity at the center section of the RF coil, the strip-shaped conductive elements and the outer conductive element are electrically connected via capacitors of which capacitances are adjusted so that a magnetic field component perpendicular to the center axis should be generated at a desired resonance frequency, and the strip-shaped conductive elements are axisymmetrically disposed with respect to the center axis of the outer conductive element. As a result, a comfortable examination space in a tunnel type MRI apparatus is achieved without increasing the manufacturing cost of the MRI apparatus.

摘要翻译： RF线圈设置有中空形的外导电元件和沿轴向方向沿着外导电元件设置的条形导电元件。 带状导电元件以不均匀的间隔设置，以将内部空间固定在未设置条形导电元件的位置。 为了在RF线圈的中心部分获得均匀的灵敏度，条状导电元件和外部导电元件通过电容被调节的电容器电连接，使得应当产生垂直于中心轴的磁场分量 并且所述带状导电元件相对于外导电元件的中心轴线对称设置。 结果，在不增加MRI装置的制造成本的情况下实现隧道式MRI装置中的舒适的检查空间。