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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