Table 3.
ILM comparison for anterior cerebral artery, middle cerebral artery, basal ganglia, and posterior circulation
| Region | DWI (n) | ILM (%) (95% CI) | ||||
|---|---|---|---|---|---|---|
| NCT | 60 keV | 70 keV | 80 keV | 90 keV | ||
| ACA | 10 | 0.0 (0.0–12.5) | 0.0 (0.0–12.5) | 0.0 (0.0–12.5) | 0.0 (0.0–12.5) | 0.0 (0.0–12.5) |
| Sub-MCA | 27 | 7.4 (2.1–23.4) | 3.7 (0.7–18.3) | 18.5 (8.2–36.7) | 33.3 (18.6–52.2)* | 29.6 (15.9–48.5) * |
| Sup-MCA | 49 | 32.7 (21.2–46.6) | 22.4 (13.0–35.9) | 36.7 (24.7–50.7) | 38.8 (26.4–52.8) | 38.8 (26.4–52.8) |
| BG | 33 | 21.2 (10.7–37.8) | 21.2 (10.7–37.8) | 39.4 (24.7–56.3) | 39.4 (24.7–56.3) | 36.4 (22.2–53.4) |
| PCA | 45 | 15.6 (7.8–28.8) | 13.3 (6.3–26.2) | 11.1 (4.8–23.5) | 13.3 (6.3–26.2) | 13.3 (6.3–26.2) |
| All | 164 | 19.5 (14.2–26.2) | 15.2 (10.5–21.5) | 25.0 (19.0–32.2) | 28.7 (22.3–36.0)* | 27.4 (21.2–34.7)* |
| IRR (95% CI) | 0.87 (0.86–0.89) | 0.88 (0.86–0.90) | 0.87 (0.85–0.89) | 0.86 (0.84–0.88) | 0.86 (0.84–0.88) | |
Pooled ILM of VMI and NCT with 95% confidence interval (CI) are presented and compared. If the difference between NCT and VMI is significant, it is highlighted with an asterisk. In addition, inter-reader reliability (IRR) with 95% confidence interval is shown for each CT reconstruction. Regions: ACA, anterior cerebral artery (A1 and A2); BG, basal ganglia (caudate, lentiform nucleus, internal capsule and insular cortex); PCA, posterior circulation (thalamus, superficial PCA, cerebellum and brainstem); sub-MCA, middle cerebral artery at level basal ganglia (M1, M2, and M3); and sup-MCA, middle cerebral artery at the level of the ventricles immediately above the basal ganglia (M4, M5, and M6)