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- Title
Optimization and Design of Multi-ring Pole Pieces for Small-sized Permanent Magnetic Resonance Imaging Magnet.
- Authors
Yi-Yuan Cheng; Tao Hai; Yang-Bing Zheng; Bao-Lei Li; Ling Xia
- Abstract
In magnetic resonance imaging (MRI) system, the main magnet creates a static magnetic field, which largely determines the final imaging quality. Pole pieces of pure-iron are commonly used to improve the field homogeneity in the imaging region. In this work, we attempt to design a novel configuration of multi-ring pole pieces for a small animal MRI system. Based on the model of a small H-type permanent magnet, the magnetic field is calculated using the finite element method, which considers the nonlinearity of the ferromagnetic materials. The pole piece was designed with the particle swarm optimization (PSO) algorithm. The results show that, the optimal multi-ring pole pieces can effectively reduce the uniformity about 10-20 ppm (10-6), with a better performance compared with the flat and traditional one-ring pole piece configuration.
- Subjects
MAGNETIC resonance imaging; MAGNETIC fields; PERMANENT magnets; FINITE element method; MAGNETIC moments
- Publication
Applied Computational Electromagnetics Society Journal, 2018, Vol 33, Issue 9, p1026
- ISSN
1054-4887
- Publication type
Article