公开(公告)号：US20140292334A1

公开(公告)日：2014-10-02

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

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

摘要： With minimizing extension of imaging time, the B1 non-uniformity 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. For example, after B1 distributions of only several sections of the AX direction are measured, the optimal radio frequency magnetic field condition for an imaging section of an arbitrary position for the AX direction is obtained by interpolation with optimal radio frequency magnetic field conditions calculated from B1 distributions of two sections near the imaging section, and the optimal radio frequency magnetic field condition for an imaging section of an arbitrary position for the SAG or COR direction is obtained by using only B1 values of a crossing region with the imaging section extracted from the B1 distributions.

摘要翻译： 随着成像时间的延长最小化，对于任意轴方向和任意位置的成像部分，RF匀场的B1均匀性减小效果最大化。 B1分布仅测量一个预定方向的几个部分，并且从B1分布数据计算使任意方向和任意位置的成像部分的B1不均匀性减小效果最大化的射频磁场条件。 例如，在AX方向的仅仅几个部分的B1分布被测量之后，通过利用从B1计算出的最佳射频磁场条件进行插值来获得用于AX方向的任意位置的成像部分的最佳射频磁场条件 通过仅使用从B1提取的成像部分的交叉区域的B1值获得用于SAG或COR方向的任意位置的成像部分的最佳射频磁场条件， 分布。

公开(公告)号：US08742759B2

公开(公告)日：2014-06-03

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： G01V3/00

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：US20130069652A1

公开(公告)日：2013-03-21

申请号：US13522928

申请日：2011-01-25

申请人： Yosuke Otake ,  Yoshihisa Soutome ,  Yukio Kaneko ,  Yoshitaka Bito ,  Hisaaki Ochi ,  Koji Hirata

发明人： Yosuke Otake ,  Yoshihisa Soutome ,  Yukio Kaneko ,  Yoshitaka Bito ,  Hisaaki Ochi ,  Koji Hirata

IPC分类号： G01R33/34

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

摘要： There is a provided a technology of receiving a magnetic resonance signal highly sensitively and with a uniform sensitivity distribution in an RF coil of an MRI device which is an RF coil including a switch circuit of switching a circuit configuration. The RF coil of the MRI device of the present invention includes a switch circuit of switching a circuit configuration. Also, the switch circuit switches the circuit configuration by being driven by a control signal received by wireless. For that purpose, the switch circuit includes an antenna of receiving the control signal and a conversion circuit of converting an alternating current voltage received into a direct current voltage.

摘要翻译： 提供了一种技术，其高灵敏度地接收磁共振信号，并且在作为包括切换电路配置的开关电路的RF线圈的MRI装置的RF线圈中具有均匀的灵敏度分布。 本发明的MRI装置的RF线圈包括切换电路结构的开关电路。 此外，开关电路通过由无线接收的控制信号驱动来切换电路配置。 为此，开关电路包括接收控制信号的天线和将所接收的交流电压转换成直流电压的转换电路。

公开(公告)号：US20120299594A1

公开(公告)日：2012-11-29

申请号：US13577885

申请日：2011-01-21

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： G01R33/28

CPC分类号： G01R33/34046

摘要： There is provided a technique for securing a comfortable examination space in a tunnel type MRI apparatus without increasing the manufacturing cost of the MRI apparatus and sacrificing performance thereof. In an RF coil provided with a hollow-shaped outer conductive element and a strip-shaped conductive element disposed along the outer conductive element in the axial direction, meander lines constituting the strip-shaped conductive element are disposed at uneven distances from the outer conductive element to secure an internal space. In order to obtain uniform sensitivity at the center of the RF coil, the strip-shaped conductive element is constituted with N of connected meander lines, and length of the strip-shaped conductive element is adjusted so that, in the strip-shaped conductive element resonating at resonance frequency of the antenna, nodes are formed in a number of (M+1)×N−1, wherein M is 0 or a natural number of 1 or larger.

摘要翻译： 提供了一种用于在隧道式MRI装置中确保舒适检查空间而不增加MRI装置的制造成本并牺牲其性能的技术。 在具有中空状的外部导电元件的RF线圈和沿着外部导电元件沿轴向设置的条状导电元件，构成条形导电元件的曲折线设置在与外部导电元件不均匀的距离处 以确保内部空间。 为了在RF线圈的中心获得均匀的灵敏度，带状导电元件由N个连接的曲折线构成，并且条形导电元件的长度被调节，使得在带状导电元件 在天线的谐振频率下共振，以（M + 1）×N-1的数量形成节点，其中M为0或自然数为1或更大。

公开(公告)号：US08115486B2

公开(公告)日：2012-02-14

申请号：US12260612

申请日：2008-10-29

申请人： Hideta Habara ,  Yoshitaka Bito

发明人： Hideta Habara ,  Yoshitaka Bito

IPC分类号： G01V3/00 ,  A61B5/055 ,  G06K9/00

CPC分类号： G01R33/3607 ,  G01R33/288 ,  G01R33/4833 ,  G01R33/4836

摘要： An MRI apparatus comprises a waveform controlling means for calculating a radio frequency pulse and applying the pulse to an irradiating means, and the waveform controlling means reads out a radio frequency pulse waveform vector from a first memory means which memorizes multiple radio frequency pulse waveform vectors, calculates a simulated irradiation pattern, and calculates a radio frequency pulse waveform which gives the minimum value of weighted sum of squares of differences of absolute values and squares of differences of phases for an ideal irradiation pattern and the simulated irradiation pattern. An RF pulse waveform showing superior ideal irradiation pattern reproducibility and providing reduced power of the RF waveform is formed, and safety of MRI subject is improved by performing imaging using such an RF pulse.

摘要翻译： MRI装置包括波形控制装置，用于计算射频脉冲并将脉冲施加到照射装置，波形控制装置从存储多个射频脉冲波形向量的第一存储装置读出射频脉冲波形向量， 计算模拟照射图案，并计算给出理想照射图案和模拟照射图案的相位差绝对值和平方差的加权平方和的最小值的射频脉搏波形。 形成显示优异的理想照射图案再现性并且提供RF波形的功率降低的RF脉冲波形，并且通过使用这样的RF脉冲进行成像来提高MRI对象的安全性。

公开(公告)号：US20110133735A1

公开(公告)日：2011-06-09

申请号：US12993905

申请日：2009-05-22

申请人： Suguru Yokosawa ,  Yo Taniguchi ,  Yoshitaka Bito ,  Hiroyuki Itagaki

发明人： Suguru Yokosawa ,  Yo Taniguchi ,  Yoshitaka Bito ,  Hiroyuki Itagaki

IPC分类号： G01R33/44

CPC分类号： A61B5/055 ,  A61B5/7285 ,  A61B5/7289 ,  A61B5/7292 ,  G01R33/288 ,  G01R33/543 ,  G01R33/5614 ,  G01R33/56325 ,  G01R33/5635

摘要： A magnetic resonance imaging apparatus is provided, which is capable of reducing SAR while maintaining S/N ratio and image contrast in a GrE-type pulse sequence, regardless of whether a synchronous imaging is performed or not.The present invention controls a flip angle as to each measurement set 409 that is obtained by division according to the size of phase encoding and a body motion cycle of a subject in the GrE-type pulse sequence. In a set 501 which measures echoes with phase encoding having a minimum absolute value, the flip angle is maximized as to the RF pulse having a minimum phase encoding amount and at least one RF pulse irradiated immediately before. As for the other RF pulses, the flip angle varies within a range less than the maximum, irrespective of the non-imaging mode, the imaging mode, or the size of phase encoding.

摘要翻译： 提供一种磁共振成像装置，其能够在保持GrE型脉冲序列中的S / N比和图像对比度的同时减小SAR，而不管是否执行同步成像。 本发明通过根据GrE型脉冲序列中的对象的相位编码的大小和体动周期进行分割而获得的每个测量组409来控制翻转角。 在测量具有最小绝对值的相位编码回波的组501中，对于具有最小相位编码量的RF脉冲和紧接着照射的至少一个RF脉冲，翻转角度最大化。 对于其他RF脉冲，翻转角度在小于最大值的范围内变化，而与非成像模式，成像模式或相位编码的大小无关。

公开(公告)号：US07733092B2

公开(公告)日：2010-06-08

申请号：US12018287

申请日：2008-01-23

申请人： Yosuke Otake ,  Yoshihisa Soutome ,  Koji Hirata ,  Yoshitaka Bito

发明人： Yosuke Otake ,  Yoshihisa Soutome ,  Koji Hirata ,  Yoshitaka Bito

IPC分类号： G01V3/00

CPC分类号： G01R33/341 ,  G01R33/34046 ,  G01R33/34053 ,  G01R33/34069 ,  G01R33/34076 ,  G01R33/3635

摘要： Provided is an RF coil which can highly efficiently and uniformly irradiate a RF magnetic field having two or more magnetic resonance frequencies close to each other, and receive magnetic resonance signals of two or more magnetic resonance frequencies close to each other with high sensitivity and uniform sensitivity profile in an MRI apparatus. Two or more frequencies to which the coil is tuned are adjusted so as to be between resonance frequencies of series resonant circuits constituting the RF coil.

摘要翻译： 提供一种可以高效地均匀地照射具有两个或更多个磁共振频率彼此接近的RF磁场的RF线圈，并以高灵敏度和均匀的灵敏度接收彼此接近的两个或更多个磁共振频率的磁共振信号 在MRI设备中。 线圈调谐到的两个或更多个频率被调整为在构成RF线圈的串联谐振电路的谐振频率之间。

公开(公告)号：US20100131506A1

公开(公告)日：2010-05-27

申请号：US12089284

申请日：2006-03-07

申请人： Takahiko Shintani ,  Yoshitaka Bito

发明人： Takahiko Shintani ,  Yoshitaka Bito

IPC分类号： G06F17/30

CPC分类号： G06K9/6218 ,  G06F2216/03 ,  G06Q30/02

摘要： An association rule is extracted by processing a database partitioned into record units in which the same attribute is missing, from a database including missing values. The association rule is extracted from the database including the missing by means for partitioning a database so that a database including a missing analysis object becomes record blocks in which the same attribute is missing, and means for estimating an upper threshold of a support value in the entire database from local support counts in partitioned databases and thereby limiting records for which the support count is counted.

摘要翻译： 通过从包含缺失值的数据库中处理分割到其中缺少相同属性的记录单元的数据库来提取关联规则。 从数据库中提取关联规则，包括通过分割数据库的方法丢失，使得包括丢失的分析对象的数据库成为其中缺少相同属性的记录块，以及用于估计在相同属性中的支持值的上限阈值的装置 来自本地支持的整个数据库在分区数据库中计数，从而限制计数支持计数的记录。

公开(公告)号：US07639012B2

公开(公告)日：2009-12-29

申请号：US12071795

申请日：2008-02-26

申请人： Hideta Habara ,  Yoshitaka Bito ,  Yoshihisa Soutome ,  Hisaaki Ochi

发明人： Hideta Habara ,  Yoshitaka Bito ,  Yoshihisa Soutome ,  Hisaaki Ochi

IPC分类号： G01V3/00

CPC分类号： G01R33/34076 ,  G01R33/34007 ,  G01R33/3635

摘要： There is provided an RF coil capable of resonating or tuning two frequencies, having uniform spatial sensitivity and having a small spatially occupied volume, especially an RF coil suitable for a high magnetic field MRI apparatus. A coil apparatus is made up of a plurality of linear conductors 200, 201 arranged around a central axis and two ring conductors 202, 203 connected to the respective ends of the plurality of linear conductors 200, 201 and capacitors are inserted in the linear conductors 200, 201 and ring conductors 202, 203. The plurality of linear conductors are made up of conductors 200 located near the central axis and conductors 201 located far from the central axis and the ring conductors 202, 203 have star-like polygonal shape so that the linear conductors are arranged alternately. This structure can realize two tuning modes; a resonance mode similar to a birdcage type resonance mode and a resonance mode which becomes zero (node) in the vicinity of the linear conductor group 200 located near the central axis.

摘要翻译： 提供了能够谐振或调谐两个频率的RF线圈，其具有均匀的空间灵敏度并且具有小的空间占用体积，特别是适用于高磁场MRI装置的RF线圈。 线圈装置由围绕中心轴线布置的多个线性导体200,201和连接到多个线性导体200,201的各个端部的两个环形导体202,203组成，并且电容器插入线性导体200 ，201和环形导体202,203。多个线性导体由位于中心轴附近的导体200和位于远离中心轴线的导体201组成，并且环形导体202,203具有星形多边形形状，使得 线性导体交替排列。 该结构可实现两种调谐方式; 类似于鸟笼型共振模式的谐振模式和在位于中心轴附近的线性导体组200附近变为零（节点）的谐振模式。

公开(公告)号：US07589530B2

公开(公告)日：2009-09-15

申请号：US11936885

申请日：2007-11-08

申请人： Hideta Habara ,  Yoshitaka Bito ,  Yoshihisa Soutome ,  Hisaaki Ochi

发明人： Hideta Habara ,  Yoshitaka Bito ,  Yoshihisa Soutome ,  Hisaaki Ochi

IPC分类号： G01V3/00

CPC分类号： G01R33/34046 ,  G01R33/3635

摘要： An RF coil which is resonant and tuned with two different frequencies, has uniform space sensitivity and occupies less space is provided. The coil is, particularly suited to the high magnetic field MRI apparatus. The coil device is equipped with the multiple number of first coils 200 having the first conducting sections 201 and 202 and the second conducting sections 203 and 204, and the second coils 205 and 206 electrically connected with the end of the multiple number of first coils. In the first conducting sections, two conducting parts 201 and 202 are electrically connected via the first condenser 207, while in the second conducting sections, two conducting parts 203 and 204 are electrically connected via the second condenser 208. And the feeding circuit and/or receiving circuit are connected in parallel with the first condenser at one or two positions. By adjusting the capacity of the first and the second condenser, the RF coil having a uniform sensitivity range at two different frequencies can be configured.

摘要翻译： 谐振和调谐两种不同频率的RF线圈具有均匀的空间灵敏度，占用较少的空间。 该线圈特别适用于高磁场MRI装置。 线圈装置配备有多个具有第一导电部分201和202以及第二导电部分203和204的第一线圈200，并且第二线圈205和206与多个第一线圈的端部电连接。 在第一导电部分中，两个导电部分201和202经由第一电容器207电连接，而在第二导电部分中，两个导电部分203和204经由第二电容器208电连接。并且馈电电路和/或 接收电路在一个或两个位置与第一电容器并联连接。 通过调整第一和第二电容器的容量，可以配置具有两个不同频率的均匀灵敏度范围的RF线圈。