TABLE 2:
Summary of infarction size, values, and ratios of cerebral blood flow, cerebral blood volume, and mean transit time
| Control (n = 13) | Progress (n = 13) | P value* | |
|---|---|---|---|
| Infarction size on MR image | |||
| Initial FLAIR image (mm2) | 50.8 ± 21.7 | 48.7 ± 21.0 | 0.814 |
| Follow-up T2WI (mm2) | 53.5 ± 21.4 | 78.3 ± 34.3 | 0.037 |
| Value and ratio on perfusion CT scan | |||
| CBF value (ml/100 g/min) | 26.1 ± 7.0 | 19.6 ± 9.0 | 0.052 |
| CBV value (ml/100 g) | 4.3 ± 0.9 | 4.8 ± 1.9 | 0.349 |
| MTT value (second) | 10.0 ± 1.3 | 14.5 ± 3.5 | <0.001 |
| CBF ratio | 0.9 ± 0.1 | 0.6 ± 0.2 | 0.016 |
| CBV ratio | 1.0 ± 0.2 | 1.0 ± 0.3 | 0.695 |
| MTT ratio | 1.1 ± 0.1 | 1.5 ± 0.4 | <0.001 |
Note.—FLAIR indicates fluid-attenuated inversion recovery; T2WI, T2-weighted image; CBF, cerebral blood flow; CBV, cerebral blood volume; MTT, mean transit time. All values are expressed as average ± SD.
*
The differences in value and ratio of cerebral blood flow, cerebral blood volume, and mean transit time were analyzed statistically between the two groups by using the unpaired Student’s t test.