Portable brain MRI scanners have the potential to increase the reach of diagnostic imaging but require relaxing constraints such as magnet homogeneity and gradient linearity or even elimination of gradient switching via a rotating magnet with built-in encoding fields. Nonetheless, the encoding matrix must retain good conditioning and excessive signal bandwidth must be controlled. To address this, we developed and validated a permanent magnet shimming method for a lightweight Halbach-style brain imaging magnet and designed and constructed a pair of compact, head-only phase encoding gradients. We demonstrate these improvements in spatial encoding with head-sized phantom and in vivo brain images.
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