Keywords MRI;magnet system;permanent magnet;passive shimming;active shimming;shim coils;FEA;magnetic induction intensity;magnetic field homogeneity;

• 磁共振成像;磁体系统;永磁体;无源匀场;有源匀场;匀场线圈;有限元分析;磁感应强度;磁场均匀度;