A METHOD, ESPECIALLY FOR PATIENT-ADAPTIVE B0 HOMOGENIZATION OF MR SYSTEMS USING DIFFERENT TYPES OF SHIM COILS

摘要

The present invention relates to a method of MRI and an MRI system (101). The MRI system includes a shim system (GSC1, GSC2, GSC3, GSC4, LSC1, LSC2). The shim system (GSC1, GSC2, GSC3, GSC4, LSC1, LSC2) includes at least one global shim coil (GSC1, GSC2, GSC3, GSC4) in a region (BRG, GSC1, GSC2, GSC3, GSC4, 112x, 112y, 112z) which surrounds the bore (103) of the MRI system (101). The shim system (GSC1, GSC2, GSC3, GSC4, LSC1, LSC2) includes at least one local shim coil (LSC1, LSC2) in the local coil (106) of the MRI system (101). Also, the MRI system includes a shim control device (117) which determines a shim current (IGSC, ILSC, m*IGSC, n*ILSC) for the global shim coil (GSC1, GSC2, GSC3, GSC4) and the shim coil (LSC1, LSC2).