Optimization and Design of Multi-ring Pole Pieces for Small-sized Permanent Magnetic Resonance Imaging Magnet

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...

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Bibliographic Details
Published in:Applied Computational Electromagnetics Society journal 2018-09, Vol.33 (9), p.1026
Main Authors: Yi-Yuan, Cheng, Tao Hai, Yang-Bing, Zheng, Bao-Lei, Li, Xia, Ling
Format: Article
Language:English
Subjects:
Algorithms
Configuration management
Design
Design optimization
Electrical engineering
Ferromagnetic materials
Finite element analysis
Finite element method
Homogeneity
Magnetic fields
Magnetic resonance imaging
Optimization
Particle swarm optimization
Permanent magnets
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Summary: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 onering pole piece configuration.
ISSN:1054-4887
1943-5711