Magnetic field generating apparatus
    4.
    发明授权
    Magnetic field generating apparatus 失效
    磁场发生装置

    公开(公告)号:US5438264A

    公开(公告)日:1995-08-01

    申请号:US82977

    申请日:1993-06-29

    CPC分类号: H01F7/0278 G01R33/383

    摘要: A magnetic field generating apparatus has a hollow permanent magnet formed of a plurality of permanent magnet elements arranged to have a polygonal section. Magnetization directions of the end portions of the hollow permanent magnet in its longitudinal direction are made different from those of the central portion thereof so that the magnetic field generated in a predetermined region in the hollow space of the permanent magnet is increased as compared with a case where the magnetizations of the hollow permanent magnet are all directed in the same direction.

    摘要翻译: 磁场产生装置具有由多个被设置为具有多边形截面的永磁体构成的中空永磁体。 中空永久磁铁的长度方向的端部的磁化方向与其中心部分的磁化方向不同,使得在永磁体的中空空间中的预定区域中产生的磁场与壳体 其中中空永磁体的磁化全部以相同方向指向。

    Magnetic field generator for MRI
    6.
    发明授权
    Magnetic field generator for MRI 失效
    磁场发生器用于MRI

    公开(公告)号:US5621324A

    公开(公告)日:1997-04-15

    申请号:US146191

    申请日:1994-01-18

    摘要: 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.

    摘要翻译: 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。

    Method for correcting phase errors in a nuclear magnetic resonance
signal and device for realizing same
    7.
    发明授权
    Method for correcting phase errors in a nuclear magnetic resonance signal and device for realizing same 失效
    用于校正核磁共振信号中的相位误差的方法和用于实现其的装置

    公开(公告)号:US5184073A

    公开(公告)日:1993-02-02

    申请号:US682472

    申请日:1991-04-09

    CPC分类号: G01R33/56563

    摘要: A method for correcting phase errors in a nuclear magnetic resonance signal is disclosed, by which central frequencies of NMR signals are measured directly before and directly after or in addition in a course of a normal measurement for obtaining an NMR signal for imaging and an amount of phase error is obtained for each of the NMR signals for imaging by using a difference between the central frequencies and a measurement time for each of the NMR signals for imaging.

    摘要翻译: 公开了一种用于校正核磁共振信号中的相位误差的方法,通过该方法,在正常测量过程中直接在直接测量之前或之后直接测量NMR信号的中心频率,以获得用于成像的NMR信号和 通过使用用于成像的每个NMR信号的中心频率和测量时间之间的差异来获得用于成像的每个NMR信号的相位误差。