Table 1.

Acquisition and image reconstruction parameters for non-contrast CT (NCCT) and ultra-low-dose CT (ULDCT) scan protocols. *) SN100: Physical Tin filter **) ASIR-V: Adaptive Statistical Iterative Reconstruction, AIDR-3D: Adaptive Iterative Dose Reduction, ADMIRE: Advanced Modelled Iterative Reconstruction.

Scanner	GE revolution CT		Canon ACQUILLION One		Siemens somatom edge
Scan mode	NCCT	ULDCT	NCCT	ULDCT	NCCT	ULDCT
Tube voltage	100 kV	100 kV	100 kV	100 kV	100 kVp	100 kVp SN100*
Image quality metric	Noise Index 22	Noise Index 85	N/A	SD 35	Quality ref mAs 100	Quality ref mAs 160
Scan time	0.5 s	0.5 s	0.35 s	0.35 s	0.5 s	0.5 s
Pitch	0.5	0.5	1.388	1.388	1.2	1.2
Collimation	128 × 0.625 mm	128 × 0.625 mm	80 × 0.5 mm	80 × 0.5 mm	128 × 0.6 mm	128 × 0.6 mm
Kernel	Lung, mediastinum	Lung, mediastinum	Lung, mediastinum	Lung, mediastinum	BL57, BR38	BL57, BR38
Image reconstruction mode**	ASIR-V 40%	ASIR-V 50%	AIDR-3D enhanced	AIDR-3D enhanced	ADMIRE 3	ADMIRE 4
Slice thickness	1.25/2.5 mm	1.25/2.5 mm	3 mm	3 mm	3 mm	3 mm
Recon increment	0.5/2.0 mm	0.5/2.0 mm	2.4 mm	2.4 mm	3 mm	3 mm
Multiplanar reformat	Coronal/sagittal 2.5 mm	Coronal/sagittal 2.5 mm	Coronal/sagittal 3 mm	Coronal/sagittal 3 mm	Coronal/sagittal 3 mm	Coronal/sagittal 3 mm