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MagTetris+ : A fast simulator for magnetic field and force calculation for ferromagnetic materials and permanent
Jing Han Heng1, Wenwei Yu2, Junqi Yang3
1Engineering Product Development, Singapore University of Technology and Design, Singapore.
Abstract:
Permanent magnet array (PMA) is a popular option for low-field portable magnetic resonance imaging (MRI) to generate the main magnetic field for polarization because it does not require large power supply nor a cooling system. A typical PMA consists of permanent magnets and ferromagnetic components, such as shims and yokes. The conventional simulation of PMA uses Finite-Element-Method (FEM). Although widely accepted as the standard for simulation accuracy, FEM is time-consuming and memory intensive, hindering research and development progress. A rapid and memory-efficient simulator for PMA consisting of ferromagnetic materials and permanent magnets is proposed. The calculation uses physics-based formulation with heuristics and stabilization term. Its field-map agreement is assessed against FEM simulations for selected benchmark cases. The results show that MagTetris+ can provide rapid preliminary field estimation with substantially reduced computation time and memory usage, while FEM remains necessary for high-fidelity validation.
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