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Table 1 Scan parameters of low-dose and ultra-low-dose chest CT protocols

From: Agreement between low-dose and ultra-low-dose chest CT for the diagnosis of viral pneumonia imaging patterns during the COVID-19 pandemic

Protocol Low-dose Ultra-low-dose
Scan type Helical Helical
Rotation time (s) 0.5 0.5
Beam collimation (mm) 40 40
Detector configuration 4 × 1.25 mm 4 × 1.25 mm
Pitch 1.5 1.5
Speed (mm/rot) 0.6 0.6
Tube voltage, kV 100 100
Tube current, mA 50 10
SFOV (scan field of view) Large body Large body
CTDIvol (CT dose index) 1.15 0.34