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Table 1 Scanning parameters for the initial “low-dose” and suggested “ultra-low-dose” CT protocol 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
Scanning parameters
kV 120 120 120 120
mA 60 60 30 30
Rotation time 0.75 0.75 0.75 0.75
mAs (mA × time) 45 45 22 22
Pitch 1.4 1.4 1.4 1.4
Eff mAs (mAs/pitch) 32 32 16 16
Slice thickness (mm) 5 5 5 5
Slice thickness recon 1.5 1.5 1.5 1.5
Field of view (FOV) 350 350 350 350
Matrix size 512 × 512 512 × 512 512 × 512 512 × 512