Title :
Three-dimensional optimal shape design of magnetic pole in permanent magnet assembly for MRI taking account of eddy currents due to gradient coil field
Author :
Yao, Yingying ; Koh, Chang Seop ; Xie, Dexin
Author_Institution :
Coll. of Electr. Eng., Zhejiang Univ., China
fDate :
3/1/2004 12:00:00 AM
Abstract :
The ferromagnetic pole pieces of permanent magnet assembly for 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 the three-dimensional 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 interested region are also investigated.
Keywords :
eddy currents; ferromagnetic materials; finite element analysis; magnetic resonance imaging; optimisation; permanent magnets; sensitivity analysis; splines (mathematics); Bezier spline; eddy currents; ferromagnetic pole pieces; finite element method; gradient coil field; magnet assembly; magnetic resonance imaging; magnetic-field homogeneity; magnetic-field strength; optimal shape design; permanent magnet; sensitivity analysis; shape optimization; transient design sensitivity; Assembly; Coils; Eddy currents; Magnetic confinement; Magnetic flux; Magnetic resonance imaging; Magnetostatics; Permanent magnets; Shape; Superconducting magnets;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2004.824576
