Values of PET variables in patients with and without collaterals other than the circle of Willis
| Variable | Ophthalmic or leptomeningeal collaterals | |
|---|---|---|
| Yes (n = 27) | No (n = 15) | |
| Values are mean (SD). CBF, cerebral blood flow; CMRO2, cerebral metabolic rate of oxygen; OEF, oxygen extraction fraction; CBV, cerebral blood volume. *p<0.05 versus corresponding value in the “No” group (Student’s t test). Comparative values for CBF, CMRO2, OEF, CBV and CBF/CBV in normal volunteers were 44.6 (4.5), 3.43 (0.33), 44.5 (3.8), 3.98 (0.48), and 11.4 (1.8), respectively. | ||
| CBF (ml/100g/min) | 29.7 (7.36) | 34.0 (9.29) |
| CMRO2 (ml/100g/min) | 2.68 (0.55) | 2.71 (0.58) |
| OEF (%) | 53.2 (7.61)* | 47.3 (5.09) |
| CBV (ml/100g) | 4.05 (0.86) | 3.73 (0.85) |
| CBF/CBV (/min) | 7.60 (2.30)* | 9.30 (2.96) |