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To fully exploit the strengths of UHF imaging, accurate B1+ mapping is essential, ideally in 3D with sufficient coverage and high dynamic range. However, resulting scan times on the order of minutes are problematic, especially with the prospect of increased clinical use of 7T imaging. We implemented a compressed sensing readout and reconstruction for the SA2RAGE technique yielding <30 s scan time for a whole-brain, 4-mm isotropic resolution B1+ map. We tested different acceleration factors, validated against the GRAPPA-accelerated reference protocol of ~2 min and found <0.05 relative B1+ difference in most regions of the brain.
Bonanno et al. (Wed,) studied this question.