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Table 1 CT imaging parameters and patient demographics

From: Development of an algorithm to automatically compress a CT image to visually lossless threshold

  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
  1. Note: aData are means ± standard deviations, with ranges in parentheses. bThe field of view was set for each patient to match the maximum transverse diameter of the body to the image size. cAutomatic tube-current modulation was used. dEstimated by multiplying the dose-length product measured on the CT console by a conversion factor (0.017 and 0.019 mSv•mGy-1•cm-1 for abdomen and chest, respectively) [39]