Table 1 CT imaging parameters and patient demographics
From: Development of an algorithm to automatically compress a CT image to visually lossless threshold
| Â | Subsets | ||||
Abdomen thick | Abdomen thin | Chest thick | Chest thin | Low-dose chest | |
Common scan parameters | Detector collimation, 64 × 0.625 mm for 64-channel MDCT and 2 × 128 × 0.625 mm for 256-channel MDCT; gantry rotation time, 0.42 s for 64-channel MDCT and 0.27 s for 256-channel MDCT; tube potential, 120 kVp; pitch, 1.077 to 1.172; matrix, 512 × 512 | ||||
Body part | Abdomen | Abdomen | Chest | Chest | Chest |
 Field of viewab | 277.2 ± 20.7 (245–323) | 281.0 ± 23.5 (249–321) | 319.0 ± 27.1 (262–383) | 317.9 ± 26.5 (271–375) | 291.5 ± 22.9 (248–329) |
 Section thickness (mm) | 4 | 2 | 3 | 2 | 3 |
 Effective mAsac | 121.5 ± 38.0 (69–222) | 127.5 ± 34.2 (62–191) | 152.3 ± 45.1 (58–249) | 151.1 ± 30.5 (72–181) | 25.6 ± 2.3 (22–31) |
 Effective radiation Dose (mSv)ad | 7.5 ± 1.0 (4.5–9.8) | 7.5 ± 1.5 (4.1–10.2) | 7.2 ± 1.1 (4.3–9.5) | 7.3 ± 0.9 (4.1–9.3) | 1.6 ± 0.1 (1.4–1.7) |
Reconstruction filter | Soft-tissue | Soft-tissue | Medium-sharp | Medium-sharp | Medium-sharp |
 Agea | 57.2 ± 27.2 (15–88) | 55.3 ± 24.8 (15:82) | 50.6 ± 26.4 (18–88) | 53.1 ± 24.4 (22–91) | 45.4 ± 22.4 (19–84) |
 Sex (Male:Female) | 22:20 | 23:19 | 22:19 | 20:21 | 23:17 |