Development of an open 0.3 T NdFeB MRI magnet

Xiaohua Jiang; Guanghui Shen; Yongchuan Lai; Jinfeng Tian

doi:10.1109/TASC.2004.831015

Development of an open 0.3 T NdFeB MRI magnet

Xiaohua Jiang, Guanghui Shen, Yongchuan Lai, Jinfeng Tian

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

An open 0.3 T NdFeB whole-body MRI magnet was developed which has a wide-access configuration. In order to obtain a high uniformity of magnetic field, a two-dimensional (2D) axisymmetric hybrid Boundary Element Method (BEM) - Integral Equation Method (IEM) was firstly employed for the magnet design, emphasizing on the optimization of the shape of the iron pole plates. An asymmetric two-column iron yoke was then designed by use of the three-dimensional (3D) ANSYS code. Both designed and measured data of the magnet are presented. To reduce the effect of induced eddy currents in the pole plates by pulsed gradient fields, a couple of specially-designed steel sheets were fixed on the pole plates. Experimental data showed that the delay of the built-up of gradient fields was improved remarkably. By passive shimming, a field homogeneity of 26 ppm on a 30 cm DSV (diameter spherical volume) was finally obtained.

Original language	English (US)
Pages (from-to)	1621-1623
Number of pages	3
Journal	IEEE Transactions on Applied Superconductivity
Volume	14
Issue number	2
DOIs	https://doi.org/10.1109/TASC.2004.831015
State	Published - Jun 2004
Externally published	Yes

Keywords

Eddy currents
Field homogeneity
Gradient fields
MRI magnets
NdFeB
Open configuration

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AU - Shen, Guanghui

AU - Lai, Yongchuan

AU - Tian, Jinfeng

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Development of an open 0.3 T NdFeB MRI magnet

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