Table 2.

Varying radiation dose levels used for phantom scanning and the different methods used for reconstruction.

Exposure [mAs]	CTDIvol [mGy]	Reconstruction algorithms
250 a	20 a	FBP, YC Filter a
235	19
185	15	iDose4 Level 3, YC filter
148 b	12 b	Precise Image (PI), Lung Definition, Sharper/Sharp/Standard/Smooth/Smoother
111 c	9 c
74	6
49	4
25 d	2 d
12	1
6	0.5

^a Dose and reconstruction parameters used for ground truth image.

^b Diagnostic reference level for a 29–33 cm water-equivalent diameter patient (Radiology ACo 2018).

^c Achievable dose level for a 29–33 cm water-equivalent diameter patient (Radiology ACo 2018).

^d Lung cancer screening level (Kazerooni et al 2014).