| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic circuit having a shape optimal for the reduction of a leakage magnetic field and excellent in workability, the convenience of installation, etc., in MRI equipment using an open-type superconductive magnet. SOLUTION: A static magnetic field generation magnet 2 consists of a cryotron part 21 incorporating a superconductive coil divided into at least two; the upper plate 25, the lower plate 26, the left support 27 and the right support 28 of a magnetic shield part constituting the magnetic circuit with respect to a magnetic flux generated by the superconducting coil. These plates and supports consist of respectively a plurality of blocks and are combined so as to be in a shape optimal for prevention of the leakage magnetic fields. The plate 26 is carried in and installed first, the support 27 and the support 28 are carried in next to be combined with the plate 26, the part 21 is carried in and combined next and the plate 25 is carried in to finally constitute the open-type superconductive magnet. |
