| 摘要 |
The invention provides tools and methods for shimming magnets such as MRI and NMR magnets, while at field. The invention provides safe methods for shimming at field. The invention particularly provides a tool ( 40 ) for withdrawing and inserting a shim tray ( 7 ) into slots ( 34 ) in a magnet ( 30 ), in the presence of a magnetic field. The tool comprises a channel ( 11, 12 ) for guiding a shim tray, alignment means ( 64, 74, 76, 6 ) for aligning the channel with a selected slot, a drive means ( 9 ) arranged to propel a shim tray along the channel; and a connector ( 96 ) arranged to detachably link the drive means to a shim tray.
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