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    • 2. 发明授权
    • Method of calculating coil pattern, and gradient magnetic field coil
    • 线圈图案计算方法和梯度磁场线圈
    • US08581586B2
    • 2013-11-12
    • US12933255
    • 2009-03-27
    • Mitsushi AbeHirotaka Takeshima
    • Mitsushi AbeHirotaka Takeshima
    • G01V3/00
    • G01R33/385
    • A coil pattern calculation method includes calculating a current potential at each contact between finite surface elements forming each of the coil surfaces based on an initial value of an input current potential distribution, and, for each of the coil surfaces, repeatedly calculating the current potential alternately and, under each magnetic field condition, determining a current potential distribution that generates a magnetic field falling within the range of allowable error for each target magnetic field so that a surface current represented by the current potential will become close to a target magnetic field distribution set for each of the finite surface elements; and determining a coil pattern from the contour lines of the determined current potential distribution.
    • 线圈图案计算方法包括基于输入电流分布的初始值来计算形成每个线圈表面的有限表面元件之间的每个接触处的电流电位,并且对于每个线圈表面,交替重复地计算电流电势 并且在每个磁场条件下,确定产生每个目标磁场的容许误差范围内的磁场的电流分布,使得由电流电位表示的表面电流将变得接近目标磁场分布集 对于每个有限表面元素; 以及从所确定的电流分布的轮廓线确定线圈图案。
    • 3. 发明申请
    • METHOD OF CALCULATING COIL PATTERN, AND GRADIENT MAGNETIC FIELD COIL.
    • 计算线圈图案和梯度磁场线圈的方法。
    • US20110018540A1
    • 2011-01-27
    • US12933255
    • 2009-03-27
    • Mitsushi AbeHirotaka Takeshima
    • Mitsushi AbeHirotaka Takeshima
    • G01R33/44
    • G01R33/385
    • The present invention eliminate the limitation of coil pattern design, facilitates the fabrication, and improves the accuracy of magnetic field. A coil pattern calculation method is characterized by comprising the steps of: calculating a current potential at each contact between finite surface elements forming each of the coil surfaces based on an initial value of an input current potential distribution, and, for each of the coil surfaces, repeatedly calculating the current potential alternately and, under each magnetic field condition, determining a current potential distribution that generates a magnetic field falling within the range of allowable error for each target magnetic field so that a surface current represented by the current potential will become close to a target magnetic field distribution set for each of the finite surface elements; and determining a coil pattern from the contour lines of the determined current potential distribution.
    • 本发明消除了线圈图案设计的限制,便于制造,并且提高了磁场的精度。 线圈图案计算方法的特征在于包括以下步骤:基于输入电流分布的初始值来计算形成每个线圈表面的有限表面元件之间的每个接触处的电流电势,并且对于每个线圈表面 ,交替地重复计算电流,并且在每个磁场条件下,确定产生每个目标磁场的容许误差范围内的磁场的电流分布,使得由当前电位表示的表面电流变得接近 到每个有限表面元件的目标磁场分布集合; 以及从所确定的电流分布的轮廓线确定线圈图案。
    • 4. 发明授权
    • Magnetic resonance imaging system
    • 磁共振成像系统
    • US06876198B2
    • 2005-04-05
    • US10380115
    • 2001-09-11
    • Shigeru WatanabeTetsuhiko TakahashiHirotaka TakeshimaHiromichi Shimizu
    • Shigeru WatanabeTetsuhiko TakahashiHirotaka TakeshimaHiromichi Shimizu
    • A61B5/055G01R33/28G01R33/54G01R33/561G01V3/00
    • G01R33/285A61B5/055G01R33/54G01R33/5611
    • A magnetic resonance imaging apparatus is provided with a sequencer for executing a rapid imaging sequence of up to 100 ms at a full scan, a parallel measurement system for executing a partial encoding measurement in which the number of phase encoding operations performed for the measurement is reduced, an image processing system for reconstructing images from the information obtained though parallel measurements and composing reconstructed images of a plurality of areas to make one image, a display system for displaying the obtained images at a rate of 50 frame/second or more, and an image renewal system for taking in coordinate information of the cross-section to be imaged from position and pointing devices at intervals of about 0.1 second, and renewing the cross-section to be imaged in real time. Thus, imaging on the cross-sections indicated by a device can be performed in real time with high spatial and high time resolution.
    • 磁共振成像装置设置有用于在全扫描时执行高达100ms的快速成像序列的定序器,用于执行部分编码测量的并行测量系统,其中对测量执行的相位编码操作的数量减少 ,图像处理系统,用于根据通过并行测量获得的信息重构图像,并且构成多个区域的重建图像以形成一个图像;显示系统,用于以50帧/秒以上的速率显示所获得的图像;以及 图像更新系统,用于以约0.1秒的间隔获取要从位置和指点设备成像的横截面的坐标信息,并实时更新要成像的横截面。 因此,可以以高空间和高时间分辨率实时地执行由装置指示的横截面上的成像。
    • 5. 发明授权
    • Magnetic resonance imaging apparatus
    • 磁共振成像装置
    • US06498488B2
    • 2002-12-24
    • US09992356
    • 2001-11-13
    • Hirotaka TakeshimaYoshihide Wadayama
    • Hirotaka TakeshimaYoshihide Wadayama
    • G01V300
    • G01R33/383G01R33/56518
    • A magnetic resonance imaging apparatus is provided with a pair of static magnetic field uniformity controlling members 30A and 30B which are disposed adjacent to respective pair of magnetic plates 25A and 25B and of which cross sections configured so as to further enhance static magnetic field uniformity in static magnetic field region 21 and a pair of flat plate shaped eddy current suppressing members 29A and 29B which are disposed adjacent to respective pair of gradient magnetic field coils 28A and 28B and shield influences of gradient magnetic field generated by the gradient magnetic field coils 28A and 28B on the static magnetic field uniformity controlling members 30A and 30B of pole pieces. The eddy current suppressing members 29A and 29B are easily manufactured from a flat plate member simply by cutting the same while following the shape of the gradient magnetic field coils 28A and 28B. Further, with the provision of the eddy current suppressing members 29A and 29B influences due to eddy current and residual magnetism induced by the gradient magnetic field coils 28A and 28B on the static magnetic field uniformity controlling members 30A and 30B are suppressed and uniformity in the uniform static magnetic field region is enhanced.
    • 磁共振成像装置设置有一对静磁场均匀性控制部件30A和30B,这些静止磁场均匀性控制部件30A和30B设置在相应的一对磁性板25A和25B附近,并且其横截面被配置为进一步增强静态磁场均匀性 磁场区域21和与各对梯度磁场线圈28A,28B相邻配置的一对平板状的涡流抑制部件29A,29B以及由倾斜磁场线圈28A,28B产生的倾斜磁场的屏蔽影响 在极片的静磁场均匀性控制构件30A和30B上。 涡流抑制部件29A,29B容易由平板部件简单地通过沿着倾斜磁场线圈28A,28B的形状切割而制作。 此外,由于涡电流抑制部件29A和29B由涡流引起的影响,由静磁场均匀性控制部件30A和30B上的梯度磁场线圈28A和28B引起的剩余磁体被抑制,均匀的均匀性 静磁场区域增强。
    • 6. 发明授权
    • Split type magnetic field generating apparatus for MRI
    • 用于MRI的分割型磁场产生装置
    • US5939962A
    • 1999-08-17
    • US906001
    • 1997-08-04
    • Yasuyuki TaharaHajime TanabeHirotaka Takeshima
    • Yasuyuki TaharaHajime TanabeHirotaka Takeshima
    • G01R33/38G01R33/381H01F5/08
    • G01R33/381G01R33/3806
    • Annular portions are arranged on mutually confronting surfaces at circumferential edge portions of low-temperature containers, the annular portions forming annular containing portions whose cross section is rectangular. Not only a side coil among a group of coils forming a collective coil body is disposed inside the containing portion, but also a gradient magnetic field unit, a radio-frequency transmission coil, and a reception coil are disposed inside a recessed portion so as to be integrated with one another into a single body, the recessed portion being formed so as to be surrounded by the corresponding annular portion. The side coil supplies more than half a designed magnetomotive force. Since a distance J of the mutually confronting low-temperature containers, i.e., the distance between the mutually confronting surfaces of the side coils can be reduced by a distance corresponding to the projection of the projected portions, not only the designed magnetomotive force can be reduced, but also the apparatus can be downsized and inexpensive.
    • 环状部分布置在低温容器的圆周边缘部分的相互面对的表面上,环形部分形成截面为矩形的环形容纳部分。 形成集体线圈体的一组线圈中的侧线圈不仅设置在容纳部内,而且还设置有倾斜磁场单元,射频发送线圈和接收线圈, 彼此一体地形成为一体,该凹部被形成为被相应的环形部分包围。 侧线圈提供超过一半设计的磁动力。 由于相互面对的低温容器的距离J,即侧面线圈的相互面对的面之间的距离可以减小与突出部分的突起相对应的距离,不仅可以减小设计的磁动势 ,而且该装置也可以小型化和便宜化。
    • 7. 发明申请
    • Electromagnet Device and Magnetic Resonance Imaging Device
    • 电磁铁装置及磁共振成像装置
    • US20110037469A1
    • 2011-02-17
    • US12516077
    • 2007-09-19
    • Mitsushi AbeHiroyuki WatanabeHirotaka Takeshima
    • Mitsushi AbeHiroyuki WatanabeHirotaka Takeshima
    • G01R33/34
    • G01R33/3806G01R33/3815H01F7/202
    • An electromagnet device which generates magnetic field in the direction perpendicular to the inserting direction of an inspection subject is reduced in size and weight by removing unnecessary arrangement as much as possible. A magnetic resonance imaging device is also provided. The electromagnet device comprises a first coil (31) through which a first circular current (J1) circulates forward, a second coil (32) through which a second circular current (J2) circulates reversely, and a coil group (30) through which a plurality of circular currents (J3-J6) circulate alternately forward and reversely. The first coil (30), the second coil (32) and the coil group (30) are arranged in this order to increase the angle of elevation θ (θ1
    • 通过尽可能地去除不必要的布置,在与检查对象的插入方向垂直的方向上产生磁场的电磁装置的尺寸和重量减小。 还提供了一种磁共振成像装置。 电磁体装置包括第一线圈(31),第一圆形电流(J1)向前循环;第二线圈(32),第二圆形电流(J2)通过该线圈反向循环;线圈组(30) 多个圆形电流(J3-J6)交替地向前和向后循环。 第一线圈(30),第二线圈(32)和线圈组(30)以此顺序排列以增加仰角; (&Thetas; 1 <&thetas; 2 <&thetas; 3)和不包括第二线圈(32)和线圈组(30)的空白区域(S)存在于仰角和角度之间的角度区域中; 2和 &thetas; 3。