Title :
New Development of Monohedral Magnet for MRI Using the Combination of Genetic Algorithm and FEM-NESM
Author :
Zhang, Yanli ; Xie, Dexin ; Bai, Baodong ; Yoon, Hee Sung ; Koh, Chang Seop
Author_Institution :
Sch. of Electr. Eng., Shenyang Univ. of Technol., Shenyang
fDate :
6/1/2008 12:00:00 AM
Abstract :
A novel monohedral permanent magnet (PM) configuration is suggested and geometrically optimized to have higher magnetic efficiency as well as higher degree of access to imaging region of a magnetic resonance imaging (MRI) system. The configuration has a pair of main PMs magnetized in the opposite directions, respectively. The geometry of the main PMs is optimized by using genetic algorithm combined with a novel flexible magnetic field analysis method which combines finite-element method and new-type equivalent source method. Through an optimal design, the suggested PM configuration is proven to provide a sufficiently homogeneous and strong magnetic field for MRI application.
Keywords :
finite element analysis; genetic algorithms; magnetic resonance imaging; permanent magnets; FEM-NESM; finite element method; flexible magnetic field analysis; genetic algorithm; magnetic efficiency; magnetic resonance imaging; monohedral permanent magnet; new-type equivalent source method; Finite element method (FEM); magnetic resonance imaging (MRI); monohedral permanent magnet (PM); new-type equivalent source method (NESM);
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2007.916270
