The ferromagnetic pole pieces of permanent magnet assembly for MRI(magnetic resonance imaging) is optimally designed taking account of the pulse excited gradient coil field. In the design, the transient design sensitivity analysis is combined with 3D finite element method to give a search direction. The effects of the eddy currents, induced on the ferromagnetic pole pieces, on the main magnetic field strength and homogeneity in diameter of spherical volume(DSV) are also investigated.
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