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Signal‐to‐noise maps for healthy volunteer, acute brain injury, and hydrocephalus DTI datasets. Left column: SNR is generally high (>5) in images acquired with the lowest b‐value (318 s/mm2). Right column: SNR is too low to justify assumptions of log Rician model only in areas of the image acquired at highest b‐value (1,541 s/mm2), which represent free CSF or are dominated by ghosting artifacts.
