Table 2.
Lowest perfusion values
| CTP parameter | Infarction at follow-up (n = 17) | No infarction at follow-up (n = 16) |
|---|---|---|
| Absolute values (median (IQR)) | ||
| CBF (mL/100 g/min) | 11.66 (8.34–16.32) | 16.08 (8.92–23.57) |
| CBV (mL/100 g) | 1.66 (1.07–2.14) | 1.78 (1.23–2.44) |
| MTT (s) | 21.72 (16.76–26.54) | 18.83 (15.65–23.05) |
| TTP (s) | 19.18 (14.86–23.76) | 18.24 (16.29–21.94) |
| Relative values (median (IQR)) | ||
| CBF ratio | 0.53 (0.42–0.60) | 0.56 (0.36–0.62) |
| CBV ratio | 0.57 (0.53–0.65) | 0.59 (0.45–0.65) |
| MTT difference (s) | 7.62 (2.96–12.10) | 4.68 (2.29–9.44) |
| TTP difference (s) | 3.77 (2.16–8.92) | 4.46 (1.77–8.01) |
Lowest perfusion values: lowest value and ratio in CBF and CBV and highest value and difference in MTT and TTP, measured in standard ROIs in gray matter and basal ganglia or perfusion deficits (if applicable)
CTP CT perfusion, n number, IQR interquartile range (25–75 %), CBF cerebral blood flow, CBV cerebral blood volume, MTT mean transit time, TTP time to peak.