| 摘要 |
Apparatus for shimming the magnetic field generated by a magnet arrangement of a magnetic resonance imaging (MRI) system, the apparatus comprising a plurality of shim devices; some at least exhibiting differing ferromagnetic characteristics, a channel incorporated in the magnet arrangement to receive a predetermined distribution of said shim devices to provide a required distribution of magnetic field; means for automatically presenting said shim devices at an entrance to said channel, and powered means for inserting said shim devices into said receiving channel in the sequence as presented. |
