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Fig. 3A. —44-year-old man with onset of left hemiparesis 5 hr before imaging. Single transverse CT source image from cine dynamic perfusion CT data set (80 kVp, 200 mAs) shows substantial region of hypoattenuation in right hemisphere. Anterior cerebral artery (green circle marked with white arrow) and superior sagittal sinus (red circle marked with black arrow) were chosen to serve as reference artery and reference vein, respectively.





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