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PASL maps (CBF-weighted) are coregistered to TOF-MRA source images. The patients either fulfill the 20% dip criterion (A, patient 18; 3647) or do not (B, patient 13; 3136). Nevertheless, dark-blue low CBF regions (arrows) are observed in both patients, suggesting local CBF decreases, possibly as a result of a local steal. Red indicates high CBF; dark blue, low CBF.
