Abstract #4374

A Temperature-Insensitive Halbach Magnet Array Design for Ultra-Low-Field MRI

Ziming Huang^1,2, Alex T. L. Leong^1,2, and Ed X. Wu^1,2

¹Laboratory of Biomedical Imaging and Signal Processing, The University of Hong Kong, Hong Kong, China, ²Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong, China

Synopsis

Halbach permanent magnet array offers lightweight and mobility but its field is sensitive to temperature, thus hindering its robust point-of-care MRI applications. This work presents a temperature-insensitive Halbach magnet array design for ultra-low-field MRI. The proposed array is of adequate bore diameter and reasonable weight (~50kg), and provides a 30 mT B0 within a 20 cm imaging field of view (FOV). Numerical simulation is conducted to test the proposed design, demonstrating a drastic reduction in temperature-induced B0 drifting and inhomogeneity.

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