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Abstract #0475

3D Printing Integrated Design and Shimming of Sparce Halbach Permanent Magnet Array for Head-Only Portable MRI

Minxuan Xu1, Wei Ming Choo2, Ting-Ou Ming Liang2, Anieyrudh R2, Yongxin Guo1,3, and Shao Ying Huang2
1Department of Electrical and Computer Engineering, National University of Singapore, Singapore, Singapore, 2Department of Engineering Product Development, Singapore University of Technology and Design, Singapore, Singapore, 3Department of Electrical Engineering, City University of Hong Kong, Hong Kong, China

Synopsis

Keywords: Low-Field MRI, Low-Field MRI, Permanent Magnet Array, 3D Printing, Magnet Shimming

Motivation: Traditional MRI devices are hindered by their size and high cost, sparking interest in low-field portable MRI. Permanent magnet arrays are critical for portability, necessitating designs with high field strength and homogeneity.

Goal(s): To effectively shim a sparse Halbach permanent magnet array without changing the structure.

Approach: Utilize MagTetris, a rapid magnetic field calculator, and genetic algorithm for optimization. Construct and shim the magnet using 3D printing for precise alignment.

Results: The final design achieved an average field strength of 38.47 mT with 171 ppm inhomogeneity across an 80 mm FOV post-shimming, an improvement of homogeneity by 11.8%.

Impact: This work proposes the applications of 3D printing to shim sparse permanent magnet arrays with construction precision. It enables faster, cost-effective magnet array shimming, advancing MRI capabilities in resource-limited settings and improving global diagnostic access.

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