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The hypoperfusion index (HI=Tmax>10 s/Tmax>6 s) in fast versus slow progressors. (A) Fast progressor: patient with an acute left “L occlusion” (distal internal carotid artery extending into the middle cerebral artery [MCA], arrow) with imaging performed 90 minutes after onset of symptoms. HI=0.6. (B) Slow progressor: patient with an acute right MCA occlusion (arrow) with imaging performed 120 minutes after onset of symptoms. HI=0.2. CBF, cerebral blood flow.
