Linear regression parameters for the association of extracranial mean blood velocity and cross-sectional area with ASL characteristicsa
| Model | Independent Variables | β | 95% CI | T-Statistic | P Value |
|---|---|---|---|---|---|
| GM-CBF | Area (cm2) | 46.5 | (8.2–84.7) | 2.03 | .046 |
| Adjusted R2 = 0.43 | Velocity (cm/s) | 1.5 | (0.8–2.3) | 3.42 | .001 |
| ASL-CBF:PC-CBF | Area (cm2) | −0.79 | (−1.58–0.01) | −1.65 | .103 |
| Adjusted R2 = 0.21 | Velocity (cm/s) | −0.02 | (−0.04–0.01) | −2.78 | .007 |
| GM-temporal SNR | Area (cm2) | 1.78 | (0.24–3.32) | 1.93 | .058 |
| Adjusted R2 = 0.47 | Velocity (cm/s) | 0.07 | (0.04–0.10) | 3.99 | <.001 |
| GM-spatial CoV | Area (cm2) | −0.11 | (−0.61–0.39) | −0.36 | .720 |
| Adjusted R2 = 0.31 | Velocity (cm/s) | −0.01 | (−0.02–0.00) | −2.01 | .048 |
↵a All models were adjusted for age, sex, and group. GM-CBF is uncorrected for labeling efficiency.