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Magn Reson Med. 1991 Jul;20(1):113-22.

Rapid, fully automatic, arbitrary-volume in vivo shimming.

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  • 1Department of Electrical Engineering, 120 Durand, Stanford University, California 94305.


MR spectroscopy and many MR imaging methods benefit from a well-shimmed magnet. We have developed a pulse sequence which enables fast and accurate measurement of three-dimensional field maps in vivo, and a data analysis package that allows calculation of shim currents to optimally shim arbitrary selected volumes. A data link to the shim power supply allows automatic update of currents. No intervention by the operator is required. Typical in vivo shimming time is less than 5 min. Performance analysis, phantom, and in vivo results are presented.

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