Maximum T Scores in Caudal Brain Stem for 2 Age Comparisons with Different Scan Lengths and Smoothing Levels
| Level of smoothing | ||||||||
| CT–CT | PET–PET | |||||||
| Scan length | 0.0 | 0.5 | 1.0 | 1.5 | 0.0 | 0.5 | 1.0 | 1.5 |
| 6–10 mo | ||||||||
| 10 min* | 7.85 | 7.69 | 7.07 | 6.11 | 4.94 | 4.80 | 4.42 | 3.66 |
| 20 min* | 7.70 | 7.22 | 7.06 | 6.17 | 4.15 | 4.11 | 3.97 | 3.66 |
| 30 min* | 7.51 | 7.90 | 8.48 | 6.59 | 4.74 | 4.05 | 3.67 | 3.48 |
| 40 min* | 8.47 | 9.00 | 8.40 | 6.10 | 4.12 | 4.18 | 4.15 | 3.92 |
| 10–14 mo | ||||||||
| 10 min* | 6.53 | 6.48 | 6.64 | 6.87 | 4.16 | 4.17 | 4.10 | 3.65 |
| 20 min* | 6.27 | 6.57 | 6.34 | 6.40 | 5.78 | 5.43 | 4.51 | 3.90 |
| 30 min* | 6.78 | 6.71 | 6.36 | 6.79 | 5.89 | 5.92 | 5.10 | 4.32 |
| 40 min* | 6.74 | 6.83 | 6.83 | 7.04 | 5.19 | 5.22 | 4.96 | 4.46 |
↵* Significant difference (P < 0.05) between CT–CT and PET–PET, based on paired t test over 4 levels of smoothing.