Optimization of a Low-Flip-Angle Phase-Based 3D B1 Mapping Technique for High Field Applications

Pippa Storey¹, Graham C. Wiggins¹, Davide Santoro¹, Daniel K. Sodickson¹

A rapid 3D low-flip-angle phase-based method for B1 measurement was originally proposed by Mugler for transmit calibration in hyperpolarized helium studies and also tested as a B1 mapping technique in protons at 1.5T. We explore ways to optimize the sensitivity and accuracy of the technique for high field applications, and present B1 maps of the thighs at 3T and the brain at 7T.