Keywords: Low-Field MRI, Low-Field MRI, Magnets (B0), New Devices
Motivation: To build a truly portable MRI scanner for neurological and MSK applications, optimized for field homogeneity and FoV size compared to standard Halbach configurations.
Goal(s): To explore elliptic-bore magnets to improve the field homogeneity and remove constraints to the extent of the gradient coils typical of Halbach magnets.
Approach: We have optimized a tightly-packed distribution of magnetic Nd2Fe14B cubes with differential evolution algorithm, and a second array of shimming magnets with interior point and differential evolution methods.
Results: We have built a 10 & 14 cm radii elliptic magnet with 87.4 mT@5700 ppm in a 10 cm radius FoV.
Impact: Elliptic-bore Halbach magnets enhance the ergonomicity and field distribution of low-costportable MRI scanners, while allowing for full-length gradient support to increase the FoV. Thisgeometry can be potentially adapted for a prospective low-cost whole-body technology.
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