The mainmagneticfield of Magnetic Resonace Imaging( MRI)device is simulated by using the finite element method.
采取了二维有限元法模拟核磁共振成像（MRI）装置的主磁场。
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Numerical implementations show that this method provides a mainmagneticfield with homogeneity and strength at the imaging region, which is defined outside of the magnet structure.
And besides, under a large power angle condition, the magneticfield distortion will enlarge air-gap part of the mainmagnetic path and influence the value of the air-gap voltage ES.