Coils carrying a relatively small current that are used to provide auxiliary magnetic fields in order to compensate for inhomogeneities in the main magnetic field of a MR system.

See also Shimming.

(SMART) Movement of the chest and abdominal wall also causes blurring and ghosting in the images due to variation of signal during data collection. Using SMART averaging is one way of reducing these artifacts but is not always possible or effective enough.

Correction of inhomogeneity of the magnetic field produced by the main magnet of a MRI system due to imperfections in the magnet or to the presence of external ferromagnetic objects. May involve changing the configuration of the magnet or the using of shim coils (active shimming) or adding or removing steel from the magnets poles (passive shimming) to fine-tune the magnetic field.

See also the related poll result: 'Most outages of your scanning system are caused by failure of'

(SMASH) A very fast gradient echo sequence.

See Ultrafast Gradient Echo Sequence.

(F-SHORT) A gradient echo sequence.

See Coherent Gradient Echo and Refocused Gradient Echo Sequence.