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    PASSIVE SHIMMING ASSEMBLY FOR MAGNETIC FIELDS
    2.
    发明授权
    PASSIVE SHIMMING ASSEMBLY FOR MAGNETIC FIELDS 有权
    安排磁场的无源匀场

    公开(公告)号：EP1224484B1

    公开(公告)日：2007-04-11

    申请号：EP00966326.1

    申请日：2000-10-12

    申请人： Siemens Magnet Technology Limited

    发明人： KRUIP, Marcel Jan Marie

    IPC分类号： G01R33/3873

    CPC分类号： G01R33/3873

    摘要： The present invention is a saturated ferromagnetic structure for controlling the homogeneity of the primary magnet field of a magnet in a Magnetic Resonance Imaging system. The structure has a plurality of coaxial laminations disposed thereon about a central axis of the structure, such that the structure is magnetically saturated and generates a magnetic field parallel to the central axis. In use the structure functions to improve the homogeneity of the primary magnetic field. The structure further allows for a MRI system with a less confined patient space than is currently available with known MRI systems.

    MRI SYSTEM WITH IMPROVED ACCESS
    8.
    发明授权
    MRI SYSTEM WITH IMPROVED ACCESS 有权
    系统具有改进ACCESS磁共振成像

    公开(公告)号：EP1226448B1

    公开(公告)日：2006-08-16

    申请号：EP00966328.7

    申请日：2000-10-12

    申请人： Siemens Magnet Technology Limited

    发明人： KRUIP, Marcel, Jan, Marie

    IPC分类号： G01R33/38

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

    摘要： The present invention provides a magnet assembly (30a, 30b) comprising a pair of drive coils (31a, 31b; 32a, 32b; 33a, 33b) symmetrically disposed with respect to a reference plane. The reference plane is located approximately equidistant between the drive coils. Each of the drive coils has a current flowing through it which is in the opposite sense to the current flowing through the other drive coil, such that a primary magnetic field is generated in a plane which is parallel to and substantially coincident with the reference plane. The assembly may comprise further compensating coils (44a, 45a, 46a) which are configured to generate a magnetic field to improve homogeneity of the primary magnetic field. The drive coils and the compensating coils are generally in the shape of a racetrack and are preferably superconducting coils.