公开(公告)号：EP0828264B1

公开(公告)日：2003-06-18

申请号：EP97907429.1

申请日：1997-03-21

申请人： Hitachi Medical Corporation

发明人： HONMEI, Takao, Hitachi Medical ,  TAKESHIMA, Hirotaka, Hitachi Medical ,  KAWANO, Hajime, Hitachi Medical ,  TAKUMA, Yutaka, Hitachi Medical ,  KOTABE, Munenori, Hitachi Medical ,  MAKI, Naoki ,  HARA, Nobuhiro ,  KAKUGAWA, Shigeru ,  HINO, Noriaki

IPC分类号： 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.

公开(公告)号：EP1036541A1

公开(公告)日：2000-09-20

申请号：EP98956014.9

申请日：1998-12-01

申请人： Hitachi Medical Corporation ,  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： A61B5/055 ,  G01R33/381

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

摘要： A magnet device which includes two sets of static magnetic field generation sources, each being constituted by current carrying means disposed concentrically in order to generate a uniform magnetic field directing in a first direction being provided with at least four current carrying means, and in which when assuming a crossing point of a first axis which is in parallel with the first direction and passes substantially the center of the current carrying means and a second axis which crosses the first axis orthogonally and locates at substantially the equal distance from the two sets of the static magnetic field generation sources as a first point and further assuming a first straight line contained on a first plane defined by the first axis, the second axis and the first point and passing through the first point, the current carrying means are disposed in such a manner that, when geometrical centers of cross sections of the current carrying means on the first plane are projected on the first straight line, the current carrying direction of the current carrying means at the respective corresponding projections of each of the static magnetic field generation sources aligns alternatively in positive and negative direction on the first straight line, thereby, an open space feeling and accessibility to an object to be inspected are improved in an MRI device.

公开(公告)号：EP0828264A1

公开(公告)日：1998-03-11

申请号：EP97907429.1

申请日：1997-03-21

申请人： HITACHI MEDICAL CORPORATION

发明人： HONMEI, Takao, Hitachi Medical ,  TAKESHIMA, Hirotaka, Hitachi Medical ,  KAWANO, Hajime, Hitachi Medical ,  TAKUMA, Yutaka, Hitachi Medical ,  KOTABE, Munenori, Hitachi Medical ,  MAKI, Naoki ,  HARA, Nobuhiro ,  KAKUGAWA, Shigeru ,  HINO, Noriaki

IPC分类号： H01F7/22

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.