APPENDIX IV: CT PROTOCOLS

	Philips iCT	GE Lightspeed VCT	GE Discovery VCT	Siemens DS Definition
MA	60	50	70	eff MAS 30-50MA
KV	100	100	100	100
Pitch	0.993	1.375: 1/55mm/rotation	1.375: 1/55mm/rotation	0.9
Collimation	128 x 0.625 mm	64 x 0.625mm	64 x 0.625mm	24 x 1.2mm
Reconstruction	1.25 x 0.625 mm soft/lung 16 x 2.5 mm Axial MIP Coronal, Sagittal	1.25 x 0.625 mm soft/lung 16 x 2.5 mm Axial MIP Coronal, Sagittal	1.25 x 0.625 mm soft/lung 16 x 2.5 mm Axial MIP Coronal, Sagittal	1.5 x 0.75 mm soft/lung 16 x 2.5 mm Axial MIP Coronal, Sagittal
Rotation Time	0.5s	0.6s	0.6s	0.5s
CTDi	~1.22	~1.48	~1.56	~1.19
Software	iDOSE (iterative recon)	ACIR (iterative recon)	standard processing	IRIS (iterative recon)