PCT rCBF values for the healthy hemisphere
| Group | Sampling Interval | ||||||
|---|---|---|---|---|---|---|---|
| 0.5 second | 1 second* | 2 seconds | 3 seconds | 4 seconds | 5 seconds | 6 seconds | |
| 1 (30 mL) | |||||||
| Mean ± SD | 45.0 ± 3.6 | 41.7 ± 3.7 | 43.3 ± 3.7 | 52.9 ± 4.6 | 71.1 ± 5.8 | 91.8 ± 15.5 | 295.1 ± 87.0 |
| Range | −2.9% to +10.7% | NA | −4.9% to +8.4% | +2.6% to +28.3% | +47.0% to +139.4% | +84.2% to +170.1% | +379.7% to +748.2% |
| P value | .038 | NA | .239 | .001 | <.001 | <.001 | <.001 |
| 2 (40 mL) | |||||||
| Mean ± SD | 43.5 ± 3.8 | 43.1 ± 3.9 | 41.6 ± 3.9 | 47.0 ± 3.5 | 53.2 ± 6.8 | 79.4 ± 13.9 | 94.0 ± 24.3 |
| Range | −5.9% to +7.9% | NA | −7.6% to +6.1% | −2.8% to +9.6% | +24.2% to +60.4% | +59.8% to +113.0% | +107.3% to +277.5% |
| P value | .759 | NA | .344 | .052 | <.001 | <.001 | <.001 |
| 3 (50 mL) | |||||||
| Mean ± SD | 45.1 ± 3.0 | 43.7 ± 3.3 | 42.1 ± 3.5 | 44.7 ± 4.4 | 55.1 ± 5.4 | 64.8 ± 8.8 | 73.6 ± 17.5 |
| Range | −4.0% to +7.2% | NA | −6.9% to +6.3% | −5.4% to +8.2% | +12.3% to +49.1% | +44.9% to +81.5% | +79.4% to +108.1% |
| P value | .276 | NA | .248 | .494 | .001 | .001 | .001 |
| 4 (60 mL) | |||||||
| Mean ± SD | 45.7 ± 3.8 | 44.2 ± 3.7 | 41.6 ± 3.6 | 42.5 ± 3.8 | 47.6 ± 4.6 | 54.6 ± 6.4 | 60.4 ± 9.3 |
| Range | −4.8% to +7.4% | NA | −8.0% to +5.7% | −7.4% to +5.5% | −4.0% to +11.0% | +8.3% to +39.4% | +22.7% to +47.7% |
| P value | .306 | NA | .112 | .252 | .012 | .004 | .001 |
Note.—No significant difference (P = .886, Kruskal-Wallis) was identified among the four groups for rCBF values obtained with an interval of 1 second. Range indicates the overestimation or underestimation compared with the reference. Values in boldface indicate the temporal sampling interval thresholds beyond which rCBF values were significantly overestimated.
* Reference for Wilcoxon (Mann-Whitney) tests performed in each group. NA indicates not applicable.