公开(公告)号：EP0828264A4

公开(公告)日：1999-05-19

申请号：EP97907429

申请日：1997-03-21

申请人： HITACHI MEDICAL CORP

发明人： HONMEI TAKAO ,  TAKESHIMA HIROTAKA ,  KAWANO HAJIME ,  TAKUMA YUTAKA ,  KOTABE MUNENORI ,  MAKI NAOKI ,  HARA NOBUHIRO ,  KAKUGAWA SHIGERU ,  HINO NORIAKI

IPC分类号： H01F13/00 ,  G01R33/3815 ,  H01F6/00

CPC分类号： H01F6/00 ,  G01R33/3815

摘要： A small-sized highly precise superconducting magnet device such that the magnetic flux changes little with the time and quenching hardly occurs. A magnetization adjusting method for uniformly magnetizing such a magnet device is also disclosed. The superconducting magnet device has a coolant container, a permanent current retaining medium which is provided in the container and generates a magnetic flux in a uniform magnetic field region (FOV), a static magnetic field generating means composed of a plurality of cylindrical bodies made up of superconducting composite plates, a cylindrical body supporting base which supports the cylindrical bodies, and temperature adjusting elements (not shown in Fig. 67) buried in the cylindrical bodies. The static magnetic field generating means is magnetized by induction magnetization and the magnetization value is adjusted by controlling the temperatures of the cylindrical bodies by means of the temperature adjusting elements.

摘要翻译： 一种小型高精度超导磁体装置，使得磁通量随时间变化很小，几乎不发生淬火。 还公开了一种用于均匀磁化这种磁体装置的磁化调整方法。 超导磁体装置具有冷却剂容器，设置在容器内并产生均匀磁场区域（FOV）的磁通量的永磁电流保持介质，由多个圆筒体构成的静磁场产生装置 的超导复合板，支撑圆柱体的圆柱体支撑基座和埋在圆柱体中的温度调节元件（图67中未示出）。 静磁场产生装置通过感应磁化磁化，并且通过温度调节元件控制圆柱体的温度来调节磁化值。

公开(公告)号：EP1340456A4

公开(公告)日：2005-11-09

申请号：EP01271111

申请日：2001-12-04

申请人： HITACHI LTD ,  HITACHI MEDICAL CORP

发明人： KAKUGAWA SHIGERU ,  AZUMA KATSUNORI ,  WAKUDA TSUYOSHI ,  WADAYAMA YOSHIHIDE ,  TAKESHIMA HIROTAKA ,  SAKAKIBARA KENJI ,  YATSUO TAKESHI ,  HONMEI TAKAO

IPC分类号： G01R33/38 ,  G01R33/3815 ,  G01R33/421 ,  A61B5/055

CPC分类号： G01R33/421 ,  G01R33/3806 ,  G01R33/3815

摘要： A magnet device provided with a shield current carrying means in which two sets of magneto static field generating sources for generating magnetic fields directed toward a first direction are disposed facing each other across a finite region and at least one set of the magnetostatic field generating sources are disposed on at least two almost concentric circles, wherein, on a first plane including a first axis, a second axis and a first point, the first point being a point of intersection between the first axis parallel to the first direction and passing the almost center of the shied current carrying means and the second axis crossing at right angles the first axis and spaced an almost equal distance from the two sets of the generating sources, positive and negative current carrying directions of one set out of two sets of magnetostatic field generating sources or those in respective sets are arranged alternately, when an angle formed by a half line at the n-th point position from the first point to extend toward the geometric center of a section of the shield current carrying means and the first axis is theta n, and the current carrying directions of the shield current carrying means are set in the order of increasing theta n.

公开(公告)号：EP1036541A4

公开(公告)日：2005-11-02

申请号：EP98956014

申请日：1998-12-01

申请人： HITACHI MEDICAL CORP ,  HITACHI LTD

发明人： KAKUGAWA SHIGERU ,  KITAMURA SHOUJI ,  HARA NOBUHIRO ,  KOMURA AKIYOSHI ,  HINO NORIAKI ,  KAWANO HAJIME ,  HONMEI TAKAO ,  TAKESHIMA HIROTAKA ,  YATSUO TAKESHI ,  TAZAKI HIROSHI

IPC分类号： G01R33/38 ,  G01R33/381 ,  G01R33/3815 ,  A61B5/055

CPC分类号： G01R33/3806 ,  G01R33/381 ,  G01R33/3815

摘要： A magnet apparatus having two static magnetic field-generating sources constituted by current-carrying means (13 to 16) arranged concentrically to generate a uniform magnetic field directed in the first direction, each static magnetic field generating source having at least four current-carrying means. Assume that a predetermined line (18) lies in a first plane including a first axis extending in parallel with the first direction and passing through near the centers of the current-carrying means, a second axis intersecting the first axis perpendicularly and existing nearly at an equal distance from the second static magnetic field-generating source. When the geometrical center of the cross section of each current-carrying means is projected onto the predetermined straight line (18) on the first plane, the forward and reverse current-carrying directions of the corresponding current-carrying means are alternatingly arranged for each of the static magnetic field-generating sources.

摘要翻译： 一种磁体装置，包括两组静磁场产生源，每组静电磁场产生源由同时设置的载流装置构成，以便产生沿第一方向引导的均匀的磁场，该磁场设有至少四个载流装置， 假设与第一方向平行的第一轴线的交叉点，并且基本上穿过载流装置的中心，并且第二轴线与第一轴线正交地交叉并且与两组静态的基本上相等的距离 磁场产生源作为第一点，并进一步假设包含在由第一轴，第二轴和第一点限定的第一平面上并通过第一点的第一直线，载流装置以这样的方式 当在第一平面上的载流装置的横截面的几何中心被投影在第二平面上时 在第一直线上，每个静磁场产生源的各个相应的突起处的电流承载装置的当前承载方向在第一直线上在正负方向上交替排列，从而具有开放空间感和可达到 在MRI装置中改进了被检查物体。

公开(公告)号：EP0817211A4

公开(公告)日：2000-10-04

申请号：EP97900120

申请日：1997-01-10

申请人： HITACHI MEDICAL CORP

发明人： TAKESHIMA HIROTAKA ,  KAWANO HAJIME ,  KAKUGAWA SHIGERU

IPC分类号： A61B5/055 ,  G01R33/38 ,  G01R33/3815 ,  G01R33/3873 ,  G01R33/421 ,  H01F6/00 ,  H01F7/20

CPC分类号： G01R33/421 ,  G01R33/3806 ,  G01R33/3815 ,  G01R33/3873 ,  H01F6/00

摘要： A superconducting magnet device for magnetic resonance imaging, which has an opening wide enough to prevent the examinee from feeling confined and to enable the operator to have easy access to the examinee, wherein magnetic leakage is reduced. The superconducting magnet device is provided with two sets of superconducting coils opposed across a uniform magnetic field are. The return circuit of external magnetic fluxes generated by the superconducting coils is constituted by arranging discoid ferromagnetic bodies and cylindrical ferromagnetic bodies around the superconducting coils and a plurality of columnar ferromagnetic bodies between the facing cylindrical ferromagnetic bodies. Therefore, the magnet device can have an opening wide enough to prevent the examinee from feeling confined and to enable the operator to have easy access to the examinee. This device causes less magnetic leakage while the manufacturing cost is low.

公开(公告)号：EP0807940A4

公开(公告)日：2000-01-19

申请号：EP96939331

申请日：1996-11-29

申请人： HITACHI MEDICAL CORP

发明人： TAKESHIMA HIROTAKA ,  KAWANO HAJIME ,  KAKUGAWA SHIGERU ,  HINO NORIAKI

IPC分类号： A61B5/055 ,  G01R33/38 ,  G01R33/3815 ,  G01R33/3875 ,  G01R33/421 ,  H01F6/00 ,  H01F7/20 ,  H01F7/22

CPC分类号： G01R33/3875 ,  G01R33/3806 ,  G01R33/3815 ,  G01R33/421

摘要： A superconducting magnet device for an MRI apparatus which has a wide opening where the subject lies so as to eliminate the feeling of being in an enclosed space. The magnetic field leakage, the weight of the device is light and a uniform strong magnetic field is created over a wide area. The static magnetic field generating source of the superconducting magnet device is constituted of two opposed sets of superconducting coil groups positioned on both sides of a uniform magnetic field generating area. Each coil group is composed of a main coil which makes an electric current to flow in a fixed direction, a compensation coil which makes another electic current to flow in the direction opposite to that of the electric current generated by the main coil, and a correction coil which corrects the uniformity of the magnetic field. The diameters of the main and compensation coils are nearly equal to each other and the diameters of the correction coil is smaller than that of the main coil. The quantity of the electric current generated by the correction coil is smaller than that of the electric current generated by the main coil. The distance between the two main coils is shorter than that between the two compensation coils.