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Table 6 Comparison between “low-dose” and “ultra-low-dose” CT protocols in this study and previous “low-dose” CT protocols

From: Ultra-low-dose chest CT protocol during the second wave of COVID-19 pandemic: a double-observer prospective study on 250 patients to evaluate its detection accuracy

  Previous studies Current study
Tabatabaei et al. [17] Dangis et al. [18] Bahrami-Motlagh et al. [19] Shiri et al. [20] Routine low dose Suggested new ultra-low dose
Number of patients 20 192 163 - 250 250
Age (mean) - 67 years - - 50 years 50 years
Weight - - - - 84 kg 84 kg
kV 120 100 110–120 90 120 120
mA 30 20 20–30 20–45 60 30
Pitch 1 1.2 1.4–1.5 0.8 1.4 1.4
Rotation time - 0.5 0.6–0.75 - 0.75 0.75
Slice thickness 3 - - - 5 5
Slice thickness recon - 1 - - 1.5 1.5
FOV - 450 - - 350 350
IOA 98–99% 92–98% - - 100% 97–100%
CTDIvol (mGy) 3.5 1.3 1.8 0.7 1.6 ± 0.4 1.1 ± 0.3
DLP (mGy.cm) 112 40 65 - 60.9 ± 9.5 42.2 ± 7.9
Mean effective dose (mSv/mGy cm) 1.8 0.56 0.9 - 0.85 0.59
Absolute cancer risk 0.74 × 10-4 0.02 × 10-4 0.04 × 10-4 - 0.03 × 10-4 0.02 × 10-4
Accuracy - - 96.6% - 95.21% 91.10–93.84%