At 7T, power restrictions are a major limitation to accurately map the absolute transmit magnetic field (B1+) in the body. To overcome this, we investigate an absolute B1+ mapping method with low RF power using magnetic resonance fingerprinting (MRF). Measurements are done in a phantom at 3T and in-vivo in the liver at 7T. Resulting maps are compared to the actual flip angle (AFI) method. The obtained results show good agreement between the two methods, while the MRF approach seems to perform better in regions of low B1+ amplitude. Motion robustness introduced by a radial acquisition scheme enables free-breathing measurements.
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