Table 2. Comparison of the SNR of Image Sets.
| FBP | ASiR-V | DLIR-Low | DLIR-Medium | DLIR-High | p-Value* | ||||
|---|---|---|---|---|---|---|---|---|---|
| DLIR-Low | DLIR-Medium | DLIR-High | |||||||
| High convexity level WM | |||||||||
| < 1 year | 4.50 ± 1.41 | 5.90 ± 2.24 | 4.90 ± 1.92 | 5.79 ± 2.43 | 9.88 ± 2.62 | 0.017 | 0.779 | 0.012 | |
| 1–6 years | 4.21 ± 2.11 | 6.27 ± 2.32 | 4.90 ± 2.63 | 5.88 ± 2.31 | 8.89 ± 1.41 | < 0.001 | 0.076 | < 0.001 | |
| 6–12 years | 3.25 ± 1.97 | 4.80 ± 2.56 | 4.05 ± 2.44 | 4.97 ± 1.83 | 6.50 ± 1.72 | < 0.001 | 0.572 | < 0.001 | |
| > 12 years | 3.47 ± 2.39 | 5.56 ± 1.93 | 4.24 ± 1.14 | 5.33 ± 2.56 | 7.84 ± 2.18 | < 0.001 | 0.244 | < 0.001 | |
| Lateral ventricle level WM | |||||||||
| < 1 year | 5.27 ± 1.63 | 7.37 ± 1.56 | 5.98 ± 1.24 | 7.13 ± 3.12 | 12.58 ± 2.44 | 0.017 | 0.092 | 0.012 | |
| 1–6 years | 3.55 ± 1.28 | 4.77 ± 1.24 | 4.11 ± 1.93 | 4.67 ± 1.67 | 6.37 ± 3.42 | 0.308 | 0.554 | < 0.001 | |
| 6–12 years | 3.95 ± 1.96 | 5.92 ± 1.12 | 4.93 ± 1.29 | 6.06 ± 2.31 | 8.40 ± 2.92 | < 0.001 | 0.503 | < 0.001 | |
| > 12 years | 4.35 ± 2.44 | 6.63 ± 1.42 | 5.23 ± 1.61 | 6.85 ± 1.61 | 10.17 ± 1.38 | < 0.001 | 0.153 | < 0.001 | |
| Infratentorial level WM | |||||||||
| < 1 year | 4.95 ± 1.28 | 5.74 ± 0.84 | 5.13 ± 0.92 | 6.09 ± 2.13 | 10.15 ± 1.81 | 0.680 | 0.740 | 0.014 | |
| 1–6 years | 4.26 ± 2.42 | 6.63 ± 1.63 | 5.05 ± 1.06 | 5.97 ± 2.69 | 8.64 ± 2.45 | < 0.001 | 0.001 | < 0.001 | |
| 6–12 years | 3.46 ± 1.31 | 4.77 ± 0.92 | 4.07 ± 0.86 | 4.86 ± 1.63 | 6.41 ± 1.94 | 0.007 | 0.673 | < 0.001 | |
| > 12 years | 4.13 ± 1.94 | 7.09 ± 1.45 | 5.10 ± 1.34 | 6.40 ± 1.41 | 8.71 ± 1.78 | < 0.001 | < 0.001 | < 0.001 | |
| CSF | |||||||||
| < 1 year | 1.3 ± 0.74 | 1.8 ± 0.52 | 1.32 ± 0.86 | 1.55 ± 1.28 | 3.47 ± 1.11 | 0.012 | 0.682 | 0.012 | |
| 1–6 years | 1.25 ± 0.72 | 1.96 ± 1.39 | 1.39 ± 0.74 | 1.67 ± 1.69 | 2.71 ± 1.27 | < 0.001 | < 0.001 | 0.003 | |
| 6–12 years | 0.90 ± 0.49 | 1.56 ± 1.69 | 1.16 ± 0.84 | 1.54 ± 0.92 | 2.36 ± 1.24 | < 0.001 | 0.801 | < 0.001 | |
| > 12 years | 0.82 ± 1.30 | 1.70 ± 1.97 | 1.14 ± 0.96 | 1.63 ± 1.19 | 2.74 ± 1.36 | < 0.001 | 0.101 | < 0.001 | |
| Air | |||||||||
| < 1 year | -209.6 ± 17.84 | -242.7 ± 15.69 | -278.2 ± 19.21 | -359.5 ± 12.04 | -525.9 ± 13.97 | 0.012 | 0.012 | 0.012 | |
| 1–6 years | -151.3 ± 14.82 | -191.8 ± 18.24 | -167.0 ± 17.64 | -222.0 ± 15.07 | -270.3 ± 24.21 | 0.263 | 0.010 | < 0.001 | |
| 6–12 years | -133.2 ± 23.3 | -183.5 ± 17.61 | -158.1 ± 21.93 | -205.7 ± 24.63 | -292.5 ± 13.81 | 0.037 | 0.017 | < 0.001 | |
| > 12 years | -126.8 ± 19.27 | -183.0 ± 22.64 | -161.0 ± 12.74 | -207.7 ± 21.69 | -269.0 ± 21.36 | < 0.001 | 0.055 | < 0.001 | |
* p value was calculated by comparison between each level of DLIR with that of ASiR-V.
ASiR = adaptive statistical iterative reconstruction, CSF = cerebrospinal fluid, DLIR = deep learning image reconstruction, FBP = filtered back projection, SNR = signal to noise ratio, WM = white matter