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    Magnetic resonance imaging magnet system
    1.
    发明公开
    Magnetic resonance imaging magnet system 有权
    用于磁共振成像磁体系统

    公开(公告)号：EP0982599A3

    公开(公告)日：2002-04-10

    申请号：EP99306174.6

    申请日：1999-08-03

    申请人： Marconi Medical Systems, Inc.

    发明人： Demeester, Gordon D. ,  McGinley, John V.M. ,  Young, Ian Robert

    IPC分类号： G01R33/3873 ,  G01R33/383

    CPC分类号： G01R33/383 ,  G01R33/3873

    摘要： A magnetic resonance imaging scanner includes a pair of opposing pole pieces (20, 20') disposed symmetrically about an imaging volume (24) facing one another. The pair of opposing pole pieces (20, 20') includes a first ferrous pole piece (20) which has a front side (22) facing the imaging volume (24) and a back side (28) . Also included is a second ferrous pole piece (20') which also has a front side (22) facing the imaging volume (24) and a back side (28) . A magnetic flux return path (30) extends, remotely from the imaging volume (24) , between a point adjacent the back side (28) of the first pole piece (20) and a point adjacent the back side (28') of the second pole piece (20') . A source of magnetic flux generates a magnetic flux through the imaging volume (24) , the pair of opposing pole pieces (20, 20') , and the magnetic flux return path (30) . An array of annular rings (40) and (40') are integrated with the pair of opposing pole pieces (20, 20') for homogenizing the magnetic flux through the imaging volume (24) . The annular rings (40, 40') are made in segments from a material having magnetic properties different from those of the pair of opposing pole pieces (20, 20') .