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. 2023 Jan 17;100(3):e336–e347. doi: 10.1212/WNL.0000000000201384

Figure 1. Illustrative Cases for Good and Poor Collaterals and Study Flowchart.

Figure 1

(A) Illustrative cases for good and poor collaterals on perfusion imaging. Patient 1 demonstrated Tmax >10 seconds volume of 7.0 mL and Tmax > 6 seconds volume of 71.3 mL, resulting in an HIR of 0.09, which is considered a marker for good collaterals, whereas patient 2 demonstrated Tmax > 10 seconds volume of 59.0 mL and Tmax > 6 seconds volume of 68.9 mL, resulting in an HIR of 0.86, which is considered a marker for poor collaterals. (B) Study flowchart. HIR = hypoperfusion intensity ratio.