Table 1.

Scan parameters of the helical chest CT protocol used in this study. “NI” stands for noise index.

kVp	AutomA	SmartmA	mA range	NI	Rot. time	SFOV	Beam colli.	Pitch	CTDIvol
120	On	On	10–670	20	0.5 s	Large	16 × 1.25 mm	0.938	11.89 mGy