公开(公告)号：US4771243A

公开(公告)日：1988-09-13

申请号：US891849

申请日：1986-08-01

申请人： Ewoud Vreugdenhil ,  Franciscus F. Van Der Vlugt

发明人： Ewoud Vreugdenhil ,  Franciscus F. Van Der Vlugt

IPC分类号： G01R33/3875 ,  A61B5/055 ,  A61B10/00 ,  G01R33/20 ,  G01R33/38 ,  G01R33/387 ,  G01R33/3873 ,  H01F7/20

CPC分类号： G01R33/3873

摘要： In a magnetic resonance imaging apparatus having a comparatively large measurement region, such as used for medical diagnosis, high-order contributions to the magnetic field are compensated for by the addition of pairs of rings made of a soft-magnetic material, so that the homogeneity of the magnetic field is locally increased to a high degree. This makes possible to use a substantially shorter coil while the field homogeneity in the measurement zone is still improved.

摘要翻译： 在用于医疗诊断的比较大的测量区域的磁共振成像设备中，通过添加由软磁性材料制成的环对来补偿对磁场的高阶贡献，使得均匀性 的磁场局部增加到很高程度。 这使得可以使用基本上较短的线圈，同时测量区域中的场均匀性仍得到改善。