We map R1 in the cortex across two sites, using IR-GRE and GRE images to calculate R1 values based on the ratio of the images (IR-GRE/GRE)) using signal equations. We collect B1+ maps to analytically correct R1 inhomogeneities that might cause site-dependent variation. We tested our R1 mapping method with two different input ratio images: one formed using an IR-GRE sequence with typical neuroanatomical contrast, and one using an IR-GRE sequence optimized to produce strong intracortical contrast. We found the ratio image with the higher intracortical contrast produced more consistent R1 maps across sites, which were less sensitive to B1+.
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