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Difference images between the Ahn & Cho ASL perfusion image and the (a) Real-time PAGE, (b) PLACE, and (c) EPI-GESTE ASL perfusion images. The unusual perfusion brightening visible in the Real-time PAGE and PLACE images of Fig. 6 appear here as dark regions in the upper left quadrant of the brain region. The shading of these regions is consistent with incorrect ghost suppression.
