A method to reduce eddy currents within iron pole plates of a 0.3 T NdFeB MRI magnet

Author

Lai, Yongchuan ; Jiang, Xiaohua ; Shen, Guanghui

Author_Institution

Dept. of Electr. Eng., Tsinghua Univ., Beijing, China

Volume

12

Issue

1

fYear

2002

fDate

3/1/2002 12:00:00 AM

Firstpage

737

Lastpage

739

Abstract

A novel method to reduce eddy currents within the iron pole plates of a 0.3 T NdFeB MRI magnet is presented. Using an ANSYS code the effect of the eddy currents on build-up of the gradient fields is firstly investigated. Based on the simulated analysis, a couple of eddy current suppressing layers are designed to be disposed on the surfaces of the pole plates. The layers, made of ordinary low carbon steel, are slit radiately. It is demonstrated by both calculated and measured results that with the eddy current suppressing layers the gradient fields build up more rapidly.

Keywords

biomedical MRI; boron alloys; eddy currents; iron alloys; neodymium alloys; permanent magnets; 0.3 T; ANSYS code; NdFeB; NdFeB MRI magnet; eddy current suppressing layers; eddy currents reduction; gradient fields; ordinary low carbon steel; pole plates; simulated analysis; Coils; Delay; Eddy currents; Iron; Magnetic analysis; Magnetic resonance imaging; Magnetic shielding; Solids; Steel; Superconducting magnets;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2002.1018507

Filename

1018507