Table 1.

The detailed CT scanning parameters utilized in this study

Adjustable Scanning Parameters	Values
kVp	120 and 140
Collimator setting (mm)	$64\times 0.625$
Rotation time (s)	0.5
Pitch	0.06
Reconstruction Filter	Standard B
Reconstruction slice thickness (mm)	3 mm
mAs/slice (effective mAs)	50, 100, 150, 200, 250, 500, 1000, 1500, 2000, 2500, and 3333 (for 120 kVp) or 3000 (for 140 kVp)
Corresponding ${\text{CTDI}}_{\text{vol}}$ (mGy) for 120 kVp scans	3.3, 6.6, 9.8, 13.1, 16.7, 32.7, 65.4, 98.1, 130.8, 168.0, and 216.9
Corresponding ${\text{CTDI}}_{\text{vol}}$ (mGy) for 140 kVp scans	4.9, 9.7, 14.5, 19.3, 24.7, 48.5, 97.0, 145.4, 193.9, 241.6, and 289.2
Reconstruction Algorithms	FBP and ${\text{iDose}}^4$ with noise reduction levels 1, 3, & 6
Phantom Diameters (cm)	38, 43, 48, 53, and 58