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Table 2 CT dosing measurements and image quality for the initial “low-dose” and suggested “ultra-low dose” CT protocols according to body weight

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

  CT protocol
Initial
“low dose”
Suggested
“ultra-low dose”
Body weight
< 80 kg ≥ 80 kg < 80 kg ≥ 80 kg
CT dose
CTDIvol (mGy) 1.6 ± 0.4 1.6 ± 0.4 1.1 ± 0.3 1.1 ± 0.3
DLP (mGy cm) 60.9 ± 9.5 60.9 ± 9.5 42.2 ± 7.9 42.2 ± 7.9
Mean effective dose (mSv/mGy cm) 0.85 0.85 0.59 0.59
Absolute cancer risk 0.03 × 10-4 0.03 × 10-4 0.02 × 10-4 0.02 × 10-4
Image quality
Objective image noise (SD) 39.1–44.4 48.3–54.1 59.5–61 65.9–73.8
Signal-to-noise ratio (SNR) 21.2–24.4 17.5–19.8 15.3–16.1 12.8–14.5