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Abstract #0904

Design of Asymmetric Permanent Magnet Arrays for the development of a Portable MR Head Imager

ZeJie Shao1 and Zhihua Ren1,2
1School of Biomedical Engineering & State Key Laboratory of Advanced Medical Materials and Devices, ShanghaiTech university, Shanghai, China, 2Shanghai Clinical Research and Trial Center, Shanghai, China

Synopsis

Keywords: Low-Field MRI, Low-Field MRI, Permanent magnet array

Motivation: To propose a new permanent magnet array with high field homogeneity and compatible with existing MRI technologies.

Goal(s): Our goal was to design an asymmetric permanent magnet array to significantly improve the field homogeneity and make it easier to manufacture.

Approach: The proposed permanent magnet array incorporates an asymmetric arrangement of magnet elements, combining elliptical and circular arrays. Additionally, shim magnets and multi-coil are employed to improve the homogeneity.

Results: The proposed array produces a field with an average strength of 55 mT and an inhomogeneity of 16984 ppm within 20 cm DSV. After shimming, the inhomogeneity was reduced to 3665 ppm.

Impact: The proposed asymmetric permanent magnet array significantly improves homogeneity, making it a promising option for portable MRI brain imaging system.

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Keywords