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Fig. 3F. —44-year-old man with onset of left hemiparesis 5 hr before imaging. CT scan shows cerebral blood flow. Blue regions in right hemisphere represent tissue with cerebral blood flow less than 10 mL/100 g per minute. Green regions represent blood flow of 10-20 mL/100 g per minute and red regions represent blood flow of greater than 20 mL/100 g per minute.