公开(公告)号：US4804919A

公开(公告)日：1989-02-14

申请号：US113602

申请日：1987-10-28

申请人： Hiroyuki Takeuchi ,  Hidenori Kishino

发明人： Hiroyuki Takeuchi ,  Hidenori Kishino

IPC分类号： A61B5/055 ,  G01R33/48 ,  G01R33/54 ,  G01R33/565 ,  G01R33/20

CPC分类号： G01R33/482 ,  G01R33/56563

摘要： Before beginning a prior art imaging sequence, at first parts producing artifact are excited by applying a high frequency magnetic field thereto in a frequency band, which includes the parts emitting artifact and doesn't include a desired slice plane. Next, the phase of the excited spin is extremely rotated by applying at least one of gradient magnetic fields G.sub.x, G.sub.y, G.sub.z. When the prior art imaging sequence is effected thereafter, the produced artifact is imaged as a high spatial frequency component of an object body to be examined. Since a usual object body to be examined contains many low spatial frequency components and the power of high spatial frequency components is extremely small, it becomes possible to reduce the artifact in such an extent that it cannot be practically recognized.

摘要翻译： 在开始现有技术的成像序列之前，通过在包括发射伪影的部分并且不包括期望的切片平面的频带中施加高频磁场来激励产生伪影的第一部分。 接下来，通过施加梯度磁场Gx，Gy，Gz中的至少一个来使激发的自旋的相位极度旋转。 当之后实现现有技术的成像序列时，所产生的假象被成像为要检查的物体的高空间频率分量。 由于要检查的通常的物体包含许多低空间频率分量，并且高空间频率分量的功率非常小，所以可以在不能实际识别的程度上减少伪影。

公开(公告)号：US09684044B2

公开(公告)日：2017-06-20

申请号：US14349424

申请日：2012-10-17

申请人： Hideta Habara ,  Yoshihisa Soutome ,  Hiroyuki Takeuchi ,  Hisaaki Ochi

发明人： Hideta Habara ,  Yoshihisa Soutome ,  Hiroyuki Takeuchi ,  Hisaaki Ochi

IPC分类号： G01R33/34 ,  G01R33/3415 ,  G01R33/345 ,  G01R33/36

CPC分类号： G01R33/34092 ,  G01R33/3415 ,  G01R33/3453 ,  G01R33/36 ,  G01R33/365

摘要： In order to provide a technique which can suppress coupling to homogenize the spatial distribution of an RF magnetic field and can improve penetration of the RF magnetic field into the subject, pad-like electric field conductors having a predetermined area are provided outside both ends of a rung conductor as a part of a configuration which forms a loop-like circuit and is driven as an antenna. An antenna device includes a sheet-like conductor, a rung conductor which is arranged at a predetermined distance from the sheet-like conductor, two electric field conductors which are arranged in both end portions of the rung conductor at a predetermined distance from the sheet-like conductor, and connection terminals which are transmission and reception terminals provided in the rung conductor and the sheet-like conductor. The rung conductor and the sheet-like conductor configure a loop circuit which resonates at a preset frequency.

公开(公告)号：US09453897B2

公开(公告)日：2016-09-27

申请号：US13817680

申请日：2011-08-18

申请人： Shouichi Miyawaki ,  Hiroyuki Takeuchi

发明人： Shouichi Miyawaki ,  Hiroyuki Takeuchi

IPC分类号： G01R33/58 ,  G01R33/389 ,  G01R33/565 ,  A61B5/055

CPC分类号： G01R33/58 ,  A61B5/055 ,  G01R33/389 ,  G01R33/56509 ,  G01R33/56518

摘要： Regardless of the measurement conditions, the degradation of the image quality due to a vibrational error magnetic field, which is generated by the vibration of the mechanical structure of an MRI apparatus, is reduced. In order to do so, error magnetic field image data indicating an error magnetic field distribution is acquired on the basis of an echo signal measured using a pulse sequence having a test gradient magnetic field, a parameter value of a damped vibration function showing a vibrational error magnetic field is calculated using the error magnetic field image data, and a correction magnetic field is calculated on the basis of the calculated parameter value of the damped vibration function showing the vibrational error magnetic field.

摘要翻译： 不管测量条件如何，减少了由MRI装置的机械结构的振动产生的由振动误差磁场引起的图像质量的劣化。 为了这样做，基于使用具有测试梯度磁场的脉冲序列测量的回波信号，获得表示误差磁场分布的误差磁场图像数据，显示振动误差的阻尼振动函数的参数值 使用误差磁场图像数据计算磁场，并且基于计算出的表示振动误差磁场的阻尼振动函数的参数值来计算校正磁场。

公开(公告)号：US20130335088A1

公开(公告)日：2013-12-19

申请号：US13979542

申请日：2012-01-13

申请人： Masanao Terada ,  Mitsushi Abe ,  Yukinobu Imamura ,  Hiroyuki Takeuchi ,  Akira Kurome

发明人： Masanao Terada ,  Mitsushi Abe ,  Yukinobu Imamura ,  Hiroyuki Takeuchi ,  Akira Kurome

IPC分类号： G01R33/385

CPC分类号： G01R33/385 ,  G01R33/4215

摘要： A gradient coil device includes a major axis gradient coil, having an ellipse in a cross section generating a gradient magnetic field inclined in a major axis direction of the ellipse at a magnetic field space; and a minor axis gradient coil, having an ellipse in a cross section generating a gradient magnetic field inclined in a minor axis direction of the ellipse at the magnetic field space. A length of the minor axis field coil in the center axis direction is shorter than a length of the major axis gradient coil in the center axis direction. A maximum value of a residual magnetic field generated by the minor axis gradient coil at a space outside the magnetic field space is equal to or smaller than a maximum value of a residual magnetic field generated by the major axis gradient coil at a space outside the magnetic field space.

摘要翻译： 梯度线圈装置包括长轴梯度线圈，在截面上具有椭圆形状，在磁场空间产生沿椭圆的长轴方向倾斜的梯度磁场; 以及短轴倾斜线圈，在截面中具有椭圆形状，在磁场空间产生在椭圆的短轴方向上倾斜的倾斜磁场。 短轴励磁线圈的中心轴方向的长度比中心轴方向的长轴梯度线圈的长度短。 在磁场空间外的空间处由短轴梯度线圈产生的剩余磁场的最大值等于或小于在磁性空间外的空间处由长轴梯度线圈产生的残余磁场的最大值 场地空间。

公开(公告)号：US08602908B2

公开(公告)日：2013-12-10

申请号：US12762646

申请日：2010-04-19

申请人： Hiroyuki Takeuchi

发明人： Hiroyuki Takeuchi

IPC分类号： A63B53/10

CPC分类号： A63B53/10 ,  A63B60/14 ,  A63B2209/023

摘要： A shaft of the present invention has a tip reinforcing layer. A prepreg s9 for the tip reinforcing layer has a portion having a larger circumferential direction width Ws toward a tip side. The prepreg s9 for the tip reinforcing layer has a thickness Pt of 0.06 mm or greater and 0.12 mm or less. An edge Ds of the tip reinforcing layer extends in an axial direction of the shaft while circulating in a circumferential direction of the shaft. An average value Ha of the five heights h11 to h15 is equal to or less than 0.03 mm.

摘要翻译： 本发明的轴具有尖端加强层。 用于尖端加强层的预浸料坯s9具有朝向尖端侧具有较大圆周方向宽度Ws的部分。 尖端加强层的预浸料坯s9的厚度Pt为0.06mm以上且0.12mm以下。 尖端加强层的边缘Ds沿着轴的轴向延伸，同时在轴的圆周方向上循环。 五个高度h11至h15的平均值Ha等于或小于0.03mm。

公开(公告)号：US08587310B2

公开(公告)日：2013-11-19

申请号：US13054155

申请日：2009-07-22

申请人： Yo Taniguchi ,  Yoshitaka Bito ,  Shoichi Miyawaki ,  Hiroyuki Takeuchi ,  Suguru Yokosawa

发明人： Yo Taniguchi ,  Yoshitaka Bito ,  Shoichi Miyawaki ,  Hiroyuki Takeuchi ,  Suguru Yokosawa

IPC分类号： G01V3/00

CPC分类号： G01R33/56518 ,  A61B5/055 ,  A61B5/7257 ,  G01R33/5616 ,  G01R33/56341 ,  G01R33/56563

摘要： In the diffusion-weighted imaging, amounts of distortion and amounts of phase offset of k-space data due to a temporally changing magnetic field error induced by eddy currents and vibrations associated with application of a diffusion-weighted gradient magnetic field pulse are corrected with good precision to improve image quality. Characteristic data for correcting distortion of k-space data are calculated for every position in the slice direction as peak shifts of projections observed between the cases of applying and not applying an MPG pulse. As the characteristic data, amounts of distortion in the read-out direction and the phase encoding direction and phase offset amounts in a slice plane are calculated.

摘要翻译： 在扩散加权成像中，由于由涡流引起的瞬时变化的磁场误差和与施加扩散加权梯度磁场脉冲相关的振动引起的k空间数据的失真量和相位偏移量被校正为良好 精度提高图像质量。 针对切片方向上的每个位置计算用于校正k空间数据的失真的特征数据，作为施加和不施加MPG脉冲的情况之间观察到的投影的峰值偏移。 作为特征数据，计算读取方向上的失真量和切片平面中的相位编码方向和相位偏移量。

公开(公告)号：US08203342B2

公开(公告)日：2012-06-19

申请号：US12519832

申请日：2007-12-13

申请人： Hisaaki Ochi ,  Yoshihisa Soutome ,  Yoshitaka Bito ,  Takeshi Yatsuo ,  Hiroyuki Takeuchi

发明人： Hisaaki Ochi ,  Yoshihisa Soutome ,  Yoshitaka Bito ,  Takeshi Yatsuo ,  Hiroyuki Takeuchi

IPC分类号： G01V3/00

CPC分类号： G01R33/385 ,  G01R33/34076 ,  G01R33/4215 ,  G01R33/422 ,  G01R33/5659

摘要： A coil unit comprises a gradient coil which is disposed along a static magnetic field generating source, and a radio frequency coil which is disposed along the gradient coil in a test region at a position closer to the center of the test region compared with the gradient coil, and a conductor part which is disposed between the gradient coil and the radio frequency coil, and covers periphery of the radio frequency coil. The radio frequency coil comprises a first loop coil and a second loop coil locating in planes substantially perpendicular to direction of the static magnetic field, a plurality of linear conductors connecting the first loop coil and the second loop coil and substantially parallel to the direction of the static magnetic field, and a plurality of first capacitors disposed in the first loop coil and the second loop coil.

摘要翻译： 线圈单元包括沿着静磁场发生源设置的梯度线圈，以及与梯度线圈相比更靠近测试区域的中心的位置处的测试区域中的沿梯度线圈布置的射频线圈 以及布置在所述倾斜线圈和所述射频线圈之间并且覆盖所述射频线圈的周围的导体部。 射频线圈包括第一环形线圈和位于基本上垂直于静态磁场方向的平面中的第二环形线圈;多个线性导体，其连接第一环形线圈和第二环形线圈，并且基本上平行于 静磁场和设置在第一环形线圈和第二环形线圈中的多个第一电容器。

公开(公告)号：US07898255B2

公开(公告)日：2011-03-01

申请号：US11813011

申请日：2006-02-06

申请人： Hisaaki Ochi ,  Yo Taniguchi ,  Hiroyuki Takeuchi

发明人： Hisaaki Ochi ,  Yo Taniguchi ,  Hiroyuki Takeuchi

IPC分类号： G01V3/00

CPC分类号： G01R33/3415 ,  A61B5/055 ,  G01R33/34084 ,  G01R33/365 ,  G01R33/3657 ,  G01R33/5611

摘要： An MRI apparatus capable of selecting an optional direction as a phase encoding direction and achieving a preferable S/N, when an imaging time shortening technique is applied. A receiver coil, used as a receiver coil of a vertical magnetic field MRI apparatus, is a combination of a first coil (solenoid coil) forming a current loop around the outer circumference of a test object, second coils forming even-numbered current loops, and third coils forming odd-numbered current loops, in the direction intersecting the plane of the current loop of the first coil. The second coil and the third coil are arranged in such a manner that, as for the current loops in the array direction thereof, a position where a sensitivity of one coil is minimized approximately coincides with a position where the sensitivity of the other coil is maximized, whereby electromagnetic coupling is suppressed.

摘要翻译： 当应用成像时间缩短技术时，能够选择可选方向作为相位编码方向并获得优选的S / N的MRI装置。 用作垂直磁场MRI设备的接收器线圈的接收器线圈是形成围绕测试对象的外圆周的电流回路的第一线圈（螺线管线圈），形成偶数电流回路的第二线圈， 以及在与第一线圈的电流回路的平面相交的方向上形成奇数电流回路的第三线圈。 第二线圈和第三线圈以这样的方式布置，即对于其排列方向上的电流环，一个线圈的灵敏度最小化的位置近似与其他线圈的灵敏度最大化的位置一致 从而抑制电磁耦合。

公开(公告)号：US20090201020A1

公开(公告)日：2009-08-13

申请号：US12423431

申请日：2009-04-14

申请人： Satoshi Hirata ,  Hisaaki Ochi ,  Yo Taniguchi ,  Tetsuhiko Takahashi ,  Hiroyuki Takeuchi

发明人： Satoshi Hirata ,  Hisaaki Ochi ,  Yo Taniguchi ,  Tetsuhiko Takahashi ,  Hiroyuki Takeuchi

IPC分类号： G01R33/48

CPC分类号： A61B5/411 ,  A61B5/0037 ,  A61B5/055 ,  A61B5/415 ,  A61B5/416 ,  A61B5/418 ,  A61B5/7257 ,  G01R33/389 ,  G01R33/485

摘要： The present invention provides a magnetic resonance imaging system capable of performing spectrum measurement even when a magnetic resonant frequency changes during MRS measurement. A time-varying rate of a water magnetic resonant frequency is measured in advance before the MRS measurement. The amount of change in water magnetic resonant frequency during the MRS measurement is predicted from the measured time-varying rate. With the predicted value as the reference, a transmission frequency of an RF magnetic field irradiated in a signal suppression pulse sequence, a transmission frequency of an RF magnetic field for excitation and inversion and a received frequency at the detection of a magnetic resonance signal in a sequence of the MRS measurement are respectively set. A high-precision spectrum measurement is hence enabled.

摘要翻译： 本发明提供一种磁共振成像系统，即使MRS测量期间磁共振频率发生变化，也能进行光谱测量。 在MRS测量之前，预先测量水磁共振频率的时变速率。 MRS测量期间水磁共振频率的变化量根据测量的时变速率预测。 以预测值为参考，在信号抑制脉冲序列中照射的RF磁场的传输频率，用于激励和反转的RF磁场的传输频率和在检测磁共振信号中的接收频率 分别设置MRS测量的顺序。 因此，能够进行高精度的频谱测量。

公开(公告)号：US07518362B2

公开(公告)日：2009-04-14

申请号：US10562643

申请日：2004-06-02

申请人： Satoshi Hirata ,  Hisaaki Ochi ,  Yo Taniguchi ,  Tetsuhiko Takahashi ,  Hiroyuki Takeuchi

发明人： Satoshi Hirata ,  Hisaaki Ochi ,  Yo Taniguchi ,  Tetsuhiko Takahashi ,  Hiroyuki Takeuchi

IPC分类号： G01V3/00

CPC分类号： A61B5/411 ,  A61B5/0037 ,  A61B5/055 ,  A61B5/415 ,  A61B5/416 ,  A61B5/418 ,  A61B5/7257 ,  G01R33/389 ,  G01R33/485

摘要： The present invention provides a magnetic resonance imaging system capable of performing spectrum measurement even when a magnetic resonant frequency changes during MRS measurement. A time-varying rate of a water magnetic resonant frequency is measured in advance before the MRS measurement. The amount of change in water magnetic resonant frequency during the MRS measurement is predicted from the measured time-varying rate. With the predicted value as the reference, a transmission frequency of an RF magnetic field irradiated in a signal suppression pulse sequence, a transmission frequency of an RF magnetic field for excitation and inversion and a received frequency at the detection of a magnetic resonance signal in a sequence of the MRS measurement are respectively set. A high-precision spectrum measurement is hence enabled.

摘要翻译： 本发明提供一种磁共振成像系统，即使MRS测量期间磁共振频率发生变化，也能进行光谱测量。 在MRS测量之前，预先测量水磁共振频率的时变速率。 MRS测量期间水磁共振频率的变化量根据测量的时变速率预测。 以预测值为参考，在信号抑制脉冲序列中照射的RF磁场的传输频率，用于激励和反转的RF磁场的传输频率和在检测磁共振信号中的接收频率 分别设置MRS测量的顺序。 因此，能够进行高精度的频谱测量。