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    • 1. 发明授权
    • Magnetic field generator for MRI
    • 磁场发生器用于MRI
    • US5621324A
    • 1997-04-15
    • US146191
    • 1994-01-18
    • Kimiharu OtaMasaaki AokiHiroyuki TakeuchiYasuhiro MarukawaHirotaka TakeshimaChikako Nakamura
    • Kimiharu OtaMasaaki AokiHiroyuki TakeuchiYasuhiro MarukawaHirotaka TakeshimaChikako Nakamura
    • A61B5/055G01R33/383H01F7/02G01V3/00
    • H01F7/0278A61B5/055G01R33/383
    • A magnet field generating apparatus for MRI, comprising:a plurality of permanent magnet assemblies disposed continuously around the angular inner circumference of a hexagonal tubular yoke to provide a uniform magnetic field at the center portion of the hollow space inside said permanent magnet assemblies; the permanent magnet assemblies forming a main magnetic field by a pair of oppositely disposed permanent magnet assemblies which are trapezoidal or square in cross-section; other pairs of permanent magnet assemblies having a triangular or square cross-section; each of the pairs of oppositely disposed permanent magnet assemblies has a side surface in contact with a part of the inner peripheral surface of the yoke and forms a plurality of permanent magnet blocks which are magnetized perpendicularly to the side surface in contact with the yoke so that the permanent magnet assemblies are magnetized perpendicularly to the side surface thereof in contact with the yoke; magnetic pole pieces disposed on each surface of the pair of oppositely disposed permanent magnet assemblies; and permanent magnet piece projections having the same magnetizing direction as the plurality of permanent magnet assemblies are respectively disposed on each surface of the paired oppositely disposed permanent magnet assemblies on which no magnetic pole piece is disposed.
    • PCT No.PCT / JP93 / 00320 Sec。 371日期1994年1月18日 102(e)日期1994年1月18日PCT 1993年3月17日PCT公布。 公开号WO93 / 18707 日期:1993年9月30日磁共振成像磁场产生装置,包括:多个永磁体组件,其围绕六边形管状磁轭的角内圆周连续设置,以在所述永磁体内部的中空空间的中心部分提供均匀的磁场 磁铁组件 所述永磁体组件通过一对相对设置的永磁体组件形成主磁场,所述永磁体组件是梯形或正方形的横截面; 其他成对的具有三角形或正方形横截面的永磁体组件; 每对相对设置的永磁体组件具有与磁轭的内周表面的一部分接触的侧表面,并且形成多个垂直于与磁轭接触的侧表面磁化的永磁体块,使得 永磁体组件被垂直于其与轭的接触的侧表面磁化; 设置在一对相对设置的永磁体组件的每个表面上的磁极片; 并且具有与多个永磁体组件相同的磁化方向的永磁体片突起分别设置在不设置磁极片的成对相对设置的永久磁铁组件的每个表面上。