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Abstract #0481

Polygonal Halbach Array for Low-Field Portable MRI

Anieyrudh R1, Bernhard Blümich2, and Shao Ying HUANG3
1Singapore University of Technology and Design, Singapore, Singapore, 2RWTH Aachen University, Aachen, Germany, 3Engineering Product Development, Singapore University of Technology and Design, Singapore, Singapore

Synopsis

Keywords: Low-Field MRI, Low-Field MRI, Halbach array, Portable MRI

Motivation: The cross-section of layered Halbach arrays should be versatile for performance optimizations and to accommodate different applications for dedicated MRI. However, it has not yet been systematically investigated.

Goal(s): To develop a formula for magnet polarizations in polygonal Halbach arrays for performance optimization.

Approach: A formula deciding the magnet polarization of polygonal Halbach arrays was proposed and tested. A hybrid array, combining polygonal and circular cross-sections, was optimized using a genetic algorithm. Simulations were done using MagTetris.

Results: Polygonal arrays achieved stronger, more homogeneous fields than circular arrays. A hybrid array increased field strength by 2.11% and homogeneity by 84.83% over circular-only arrays.

Impact: This study lays the groundwork for optimizing layered Halbach arrays with unexplored polygonal and hybrid shapes that achieve stronger, more homogeneous fields. A formula for versatile cross-sections enables further innovation in magnet array designs.

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