Table 3.
Intraclass correlation coefficients of intra-rater comparisons of volume blood flow measurements for each cerebral artery in the circle of Willis.
| Artery | Operator A | Operator B | Average Measure * | SEM * | MDC95% | |||
|---|---|---|---|---|---|---|---|---|
| ICC (95% CI) | P-Value | ICC (95% CI) | P-Value | ICC (95% CI) | P-Value | (mL/min) | (mL/min) | |
| LVA | 0.85 (0.689–0.931) | <0.001 | 0.773 (0.551–0.893) | <0.001 | 0.925 (0.83–0.967) | <0.001 | 20.1 | 55.7 |
| RVA | 0.794 (0.573–0.907) | <0.001 | 0.883 (0.749–0.948) | <0.001 | 0.954 (0.892–0.981) | <0.001 | 12.0 | 33.3 |
| BA | 0.799 (0.6–0.904) | <0.001 | 0.773 (0.555–0.891) | <0.001 | 0.893 (0.761–0.952) | <0.001 | 24.2 | 67.1 |
| LPCA | 0.568 (0.231–0.784) | 0.001 | 0.695 (0.42–0.853) | <0.001 | 0.837 (0.63–0.928) | <0.001 | 11.6 | 32.2 |
| RPCA | 0.548 (0.185–0.78) | 0.003 | 0.676 (0.39–0.843) | <0.001 | 0.841 (0.625–0.933) | <0.001 | 12.3 | 34.1 |
| LMCA | 0.75 (0.518–0.88) | <0.001 | 0.888 (0.767–0.948) | <0.001 | 0.881 (0.73–0.948) | <0.001 | 18.2 | 50.4 |
| RMCA | 0.523 (0.177–0.753) | 0.003 | 0.638 (0.34–0.82) | <0.001 | 0.749 (0.43–0.889) | 0.001 | 23.2 | 64.3 |
| pLACA | 0.65 (0.358–0.826) | <0.001 | 0.858 (0.712–0.933) | <0.001 | 0.855 (0.677–0.935) | <0.001 | 12.8 | 35.5 |
| pRACA | 0.786 (0.572–0.9) | <0.001 | 0.861 (0.718–0.934) | <0.001 | 0.936 (0.856–0.972) | <0.001 | 14.0 | 38.8 |
| LICA | 0.687 (0.415–0.846) | <0.001 | 0.624 (0.318–0.812) | <0.001 | 0.841 (0.645–0.929) | <0.001 | 31.7 | 87.9 |
| RICA | 0.787 (0.58–0.899) | <0.001 | 0.554 (0.22–0.772) | 0.001 | 0.880 (0.733–0.946) | <0.001 | 34.7 | 96.2 |
| dLACA | 0.482 (0.124–0.729) | 0.005 | 0.141 (−0.262–0.502) | 0.25 | 0.641 (0.185–0.842) | 0.007 | 13.8 | 38.3 |
| dRACA | 0.526 (0.181–0.755) | 0.002 | 0.687 (0.415–0.847) | <0.001 | 0.796 (0.537–0.91) | <0.001 | 13.0 | 36.0 |
ICC, intraclass correlation coefficient; CI, confidence interval; SEM, standard error of measurement; MDC95%, minimum detectable change at 95% CI; LVA, left vertebral artery; RVA, right vertebral artery; BA, basilar artery; LPCA, left posterior cerebral artery; RPCA, right posterior cerebral artery; LMCA, left middle cerebral artery; RMCA, right middle cerebral artery; pLACA, proximal segment of the left anterior cerebral artery; pRACA, proximal segment of the right anterior cerebral artery; LICA, left internal carotid artery; RICA, right internal carotid artery; dLACA, distal segment of the left anterior cerebral artery; dRACA, distal segment of the right anterior cerebral artery. * Average blood flow measure between operator A and operator B.