In this abstract, we introduce 31P-MT-MRF, using a SAR efficient magnetization transfer (MT) approach. We extended the magnet resonance fingerprinting (MRF) framework to overcome obstacles of in vivo human brain 31P measurements. This abstract reports the reproducibility and robustness of 31P-MT-MRF estimations of the relaxation parameters of y-ATP and PCr as well as the chemical exchange rate kCK on healthy volunteers in vivo in human brain at 7T. We were able to demonstrate that our method is 3 times faster as state-of-the-art MT methods [6] and estimates are bias free enabling ultra-fast kCK measurement in 2:15 min scan time.
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