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    • 17. 发明授权
    • Open configuration MRI magnetic flux path
    • 开放配置MRI磁通路径
    • US5864236A
    • 1999-01-26
    • US675925
    • 1996-07-05
    • Andrew Li
    • Andrew Li
    • G01R33/3815A61B5/055G01R33/38G01R33/3875G01V3/00
    • G01R33/3806
    • An improved MRI magnet structure is created by utilizing a lower pole mounting support with one or more vertically extending yokes. The one or more vertically extending yokes mount an upper pole mounting structure including an upper pole mounting ring and at least one spoke connecting the ring to at least one of the vertically extending structural supports. The average effective spacing of the upper pole mounting structure is greater than the air gap between the upper and lower pole thereby resulting in improved uniformity of the B.sub.o field at the patient imaging volume. In a preferred embodiment, a pie-shaped cryostat encompasses a plurality of radially distributed superconducting electromagnets for generating a more uniform field in the patient imaging volume. The patient imaging field uniformity in some embodiments can be improved by the use of shim coils and/or shim rings associated with either the upper or lower poles to further modify the field within the patient imaging volume.
    • 通过利用具有一个或多个垂直延伸的轭的下极安装支撑件来创建改进的MRI磁体结构。 一个或多个垂直延伸的轭架安装上极安装结构,其包括上极安装环和至少一个将环连接到垂直延伸的结构支撑件中的至少一个上的辐条。 上极安装结构的平均有效间距大于上极和下极之间的气隙,从而导致改善患者成像体积上的Bo场的均匀性。 在优选实施例中,饼形低温恒温器包含多个径向分布的超导电磁体,用于在患者成像体积中产生更均匀的场。 通过使用与上极或下极相关联的垫片线圈和/或垫圈可以改善一些实施例中的患者成像场均匀性,以进一步修改患者成像体积内的场。