Active ferromagnetic shimming of the permanent magnet for magnetic resonance imaging scanner

doi:10.1088/1674-1056/19/7/078702

Abstract This paper presents an approach of active ferromagnetic shimming for C-type permanent magnetic resonance imaging (MRI) magnet. It is designed to reduce inhomogeneity of magnetostatic field of C-type permanent magnet to meet the stringent requirement for MRI applications. An optimal configuration (locations and thicknesses) of active ferromagnetic pieces is generated through calculation according to the initial field map and the demanded final homogeneity specifications. This approach uses a minimisation technique which makes the sum of squared magnetic moment minimum to restrict the amount of the active ferromagnetic material used and the maximal thickness of pieces stacked at each hole location in the shimming boards. Simulation and experimental results verify that the method is valid and efficient.

Keywords: magnetic resonance imaging active ferromagnetic shimming permanent magnet NdFeB pieces

Revised: 21 November 2009
Accepted manuscript online:

PACS:	75.30.Cr	(Saturation moments and magnetic susceptibilities)
	75.50.Ww	(Permanent magnets)
	87.61.-c	(Magnetic resonance imaging)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60871001).

Cite this article:

Tang Xin (唐昕), Hong Li-Ming (洪礼明), Zu Dong-Lin (俎栋林) Active ferromagnetic shimming of the permanent magnet for magnetic resonance imaging scanner 2010 Chin. Phys. B 19 078702

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Active ferromagnetic shimming of the permanent magnet for magnetic resonance imaging scanner

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