TABLE II.
Measured US imaging and MR imaging parameters (values ±STD) at three time points.
| Baseline (n = 13) | 1 day postradiation (n = 7) | 4 days postradiation (n = 7) | |
|---|---|---|---|
| US imaging | |||
| V (US) (mm3) | 71.0±18.6 | 70.0±18.6 | 63.1±11.4 |
| PV (%) | 3.15±3.81 | 2.25±3.36 | 1.34±2.11 |
| PE (a.u.) | 2.01±1.77 | 1.80±0.20 | 1.18±1.12 |
| WiAUC (a.u.) | 9.53±7.82 | 11.77±9.07 | 6.00±4.75 |
| RT (a.u.) | 6.50±3.42 | 8.63±6.27 | 8.96±4.30 |
| TTP (s) | 7.67±3.75 | 9.47±6.34 | 9.96±4.67 |
| AUC (a.u.) | 291.1±336.6 | 183.8±109.0 | 62.1±61.7∗ |
| MTT (s) | 226.6±182.6 | 135.3±113.9 | 118.2±45.1 |
| PI (a.u.) | 1.36±1.51 | 1.58±0.57 | 0.50±0.42 |
| MR imaging | |||
| T2 (ms) | 72.1±2.2 | 72.3±1.1 | 74.3±1.9∗ |
| T1 (s) | 1.79±0.05 | 1.79±0.01 | 1.80±0.05 |
| ADC (10−9 m2/s) | 1.09±0.03 | 1.12±0.03 | 1.13±0.02∗∗ |
| CBF [ml/(100 g/min)] | 70.6±27.5 | 58.0±19.3 | 29.2±11.3∗∗∗ |
| APTw (%) | 3.81±0.58 | 3.53±0.63 | 2.50±0.43∗∗∗ |
| V (MRI) (mm3) | 99.4±34.7 | 105.9±21.64 | 174.2±85.8∗ |
Note: The statistical significance of the difference between the parameters at baseline and those at 1 day or 4 days postradiation: *p < 0.05, **p < 0.01, ***p < 0.001. Here, a.u. is an arbitrary unit.