B fields in the ROI. c) Variation of the mean signal with FAs and fitting results of λ r and λ t . A spoiled gradient echo sequence (SPGR) was used in the MRI experiment. d) λ t and λ r mappings. λ t is the enhancement ratio of the ACWM on the real FA or transmitting field, and λ r is the enhancement ratio corresponding to the signal intensity. Scale bar: 100 mm.
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