Table 2.
Distribution of image noise and SNR of CW and AW groups in different lesion locations in chest CT.
| Lesion location (zone) | All lesions (n, CW/AW) | Image noise (HU, mean±SD) |
SNR |
||||
|---|---|---|---|---|---|---|---|
| CW | AW | P values | CW | AW | P values | ||
| Apical | 71/86 | 136.3 ± 70.7 | 133.3 ± 71.1 | 0.713 | 6.3 ± 4.1 | 6.7 ± 3.1 | 0.120 |
| Central | 59/72 | 134.1 ± 66.3 | 130.2 ± 67.5 | 0.430 | 6.4 ± 4.2 | 6.9 ± 3.9 | 0.188 |
| Peripheral | 232/261 | 146.6 ± 66.7 | 135.8 ± 74.4 | 0.069 | 5.4 ± 4.3 | 6.8 ± 4.4 | 0.011 |
| Centrilobular | 497/534 | 153.8 ± 72.7 | 140.4 ± 78.6 | 0.028 | 4.9 ± 3.7 | 6.6 ± 4.3 | 0.006 |
| Subpleural | 197/231 | 159.4 ± 82.7 | 140.6 ± 80.8 | 0.010 | 4.8 ± 4.0 | 6.4 ± 4.4 | <0.001 |
The data are mean±SD, where n is the number of the pulmonary lesions with available data. CW: conventional manual workflow; AW: automatic contactless workflow; SNR: signal-to-noise ratio.