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Fig. 2C. —75-year-old man with right internal carotid artery stenosis. ¹³³Xe SPECT image obtained with patient resting shows decreased cerebral blood flow bilaterally. Cerebral blood flow values were 30 mL/100 g per minute in right middle cerebral artery territory and 32 mL/100 g per minute in left middle cerebral artery territory. Note that mean transit time image (B) is superior to the ¹³³Xe SPECT image in spatial resolution. R = right, L = left.