Quantitative analysisa
| 70 kVp | 80 kVp | P Value | |
|---|---|---|---|
| CBF | |||
| WM | |||
| Mean | 5.47 | 8.76 | .05 |
| SD | 2.26 | 4.47 | .35 |
| SNR | 2.81 | 3.20 | .66 |
| GM | |||
| Mean | 40.03 | 40.76 | .87 |
| SD | 14.84 | 16.94 | .94 |
| SNR | 4.38 | 3.95 | .92 |
| CBV | |||
| WM | |||
| Mean | 1.50 | 0.95 | .44 |
| SD | 0.41 | 0.35 | .21 |
| SNR | 3.15 | 4.97 | .07 |
| GM | |||
| Mean | 4.88 | 3.49 | .75 |
| SD | 1.45 | 1.08 | .21 |
| SNR | 5.34 | 6.53 | .18 |
| Tmax | |||
| WM | |||
| Mean | 7.81 | 6.52 | .10 |
| SD | 1.72 | 1.63 | .47 |
| SNR | 6.22 | 7.08 | .96 |
| GM | |||
| Mean | 3.94 | 4.51 | .13 |
| SD | 0.68 | 1.03 | .31 |
| SNR | 6.82 | 6.72 | .82 |
| Arterial max | |||
| Thalamus | |||
| Mean | 59.71 | 50.25 | .0005 |
| SD | 11.96 | 11.34 | .426 |
| SNR | 6.43 | 4.69 | .3316 |
| Venous max | |||
| Thalamus | |||
| Mean | 56.72 | 48.68 | .0032 |
| SD | 11.67 | 10.91 | .3811 |
| SNR | 5.11 | 4.62 | .4738 |
Note:—max indicates maximum; Tmax, time-to-maximum.
↵a Data are presented as mean, SD, and SNR.