公开(公告)号：US06333630B1

公开(公告)日：2001-12-25

申请号：US09568124

申请日：2000-05-10

申请人： Ronald F. Holsinger ,  Kang-suk Lee ,  Chi-woong Mun ,  Chang-wook Moon ,  Jung-hoe Kim ,  Sang-bok Nam

发明人： Ronald F. Holsinger ,  Kang-suk Lee ,  Chi-woong Mun ,  Chang-wook Moon ,  Jung-hoe Kim ,  Sang-bok Nam

IPC分类号： G01V300

CPC分类号： G01R33/3806 ,  G01R33/383

摘要： A magnetic field generating apparatus for a magnetic resonance imaging (MRI) system adopting a C-shaped open magnet support structure includes a pair of polygonal permanent magnets disposed parallel to each other in the horizontal plane, with a predetermined imaging area therebetween; a pair of polygonal magnetic pole plates, stacked to face each other on the inner sides of the pair of permanent magnets, respectively; a pair of yokes to which the permanent magnets are fixed; at least one column for connecting the two yokes at one ends thereof with the imaging area being interposed between the yokes, wherein the at least one column together with the pair of yokes forms a closed path of the magnetic field; shims disposed at the vertexes of the polygonal magnetic pole plates, the shims having a polygonal shape, wherein the shims of one of the polygonal magnetic pole plates face those of the other polygonal magnetic pole plate; peripheral permanent magnets disposed along the edges of the polygonal magnetic pole plates, wherein the peripheral permanent magnets of one of the polygonal magnetic pole plates face those of the other polygonal magnetic pole plate; and booster shims arranged in the spaces between adjacent peripheral permanent magnets disposed at the vertexes of the polygonal magnetic pole plates.

摘要翻译： 采用C形开放磁体支撑结构的磁共振成像（MRI）系统的磁场产生装置包括在水平面上彼此平行设置的一对多边形永久磁铁，其间具有预定的成像区域; 一对多边形磁极板，分别在所述一对永磁体的内侧面彼此相对地堆叠; 固定有永磁体的一对轭铁; 至少一个列，用于在其一端连接两个轭，其中所述成像区被插入在所述轭之间，其中所述至少一个列与所述一对轭形成所述磁场的闭合路径; 垫片设置在多边形磁极板的顶点处，垫片具有多边形形状，其中多边形磁极板之一的垫片面对另一个多边形磁极板的垫片; 沿着所述多边形磁极板的边缘设置的外围永磁体，其中所述多边形磁极板之一的外围永久磁铁与所述另一个多边形磁极板的周边永磁体相对; 以及设置在设置在多边形磁极板的顶点处的相邻外围永磁体之间的空间中的增压垫片。