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To assess subject motion, or more generally, misalignment between the DW images, computing the standard deviation across the DW images SDWI is an efficient and more quantitative approach than inspection of the DW images on a slice-by-slice basis. The bright rim in the SDWI map shown in (a) is not present after correction for subject motion and eddy current induced geometric distortions (b) (see arrowheads).
