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Contrast Change, from SPGR to MPRAGE: (a) a T1w spoiled gradient recalled (SPGR) acquistion, (b) its true magentization prepared rapid gradient echo (MPRAGE) acquistion of same resolution, (c) a synthetic MPRAGE of same resolution as the SPGR. Normalized mutual information between them is 0.3254, while it is 0.3341 between the SPGR and the true MPRAGE.
