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Fig 2. Yin-Yang artifact: scan-rescan MR images from the same day. Left column, Baseline image (scan). Middle column, Coregistered second time-point image (rescan). Right column, Subtraction image (rescan-scan). Yin-Yang artifacts are shown (white arrows) in the subtraction image (right column). An artifact from vessel misregistration is shown (white arrowhead) in the subtraction image. (In all of the images, the skull has been stripped by masking with ICC.)
