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A 61-year-old woman with left hemiparesis who had right MCA (M1) occlusion (not shown) but sufficient collaterals on baseline conventional angiography. DWI shows right MCA territorial infarction. Processed perfusion maps show 3.5 mL of severe (ATD>6 seconds) hypoperfusion, 42 mL of moderate (ATD2–6 seconds) hypoperfusion, and a mean rCBV2–6 seconds of 1.7 within the hypoperfused area. The Perfusion Collateral Index is 42 × 1.7 = 71.4.
