Table 1.

CT Chest protocols for quantitative lung imaging

	Siemens Definition AS+	Siemens FORCE	GE CT750 HD	GE Revolution	Philips iCT	Canon Genesis	Canon PrimeSP
Intravenous contrast	No	No	No	No	No	No	No
Detector configuration (number x mm)	128 × 0.6	192 × 0.6	64 × 0.625	128 × 0.625	128 × 0.625	80 × 0.5	80 × 0.5
SOV	–	–	Large body	Large body	–	Large	Large
Organ characteristic	Thorax Ensured by first selecting a Siemens default routine adult chest protocol	Thorax Ensured by first selecting a Siemens default routine adult chest protocol	–	–	–	–	–
Rotation time (s)	0.5	0,025	0.5	0.5	0.5	0.275	0.35
Scanner Pitch	1.0	1.0	0.984	0.992	1.0	Standard	Standard
kVp	120 (Automated kV control – off)	120 (Automated kV control – off)	120	120	120	120	120
Tube current modulation	Care dose: on	Care dose: on	AutomA & SmartmA: On	AutomA & SmartmA: On	DoseRight On	SureExposure On	SureExposure On
Quality reference mAs – Software v. 2012B, VA48, and VA50	42	36	–	–	–	–	–
Quality reference mAs – (VB10 & VB20)	29	25	–	–	–	–	–
Max mA	–	–	800		–	700	700
mA	–	–	–	SmartmA 30–500	–	20–700	20–700
Noise index	–	–	85	61	–	12.5	12.5
DRI	–	–	–	–	8	–
Slice thickness x interval (mm)	1 × 0.5	1 × 0.5	1 × 0.5	1 × 0.5	1 × 0.5	1 × 0.5	1 × 0.5
Reconstruction Kernel	Q30f	Qr40	Standard	Standard	B (Standard)	Lung Standard	Lung Standard
Iterative algorithms	SAFIRE 5	ADMIRE 5	ASiR-V 60%	ASiR-V 60%	iDose 6	AIDR3De	AIDR 3De
Reconstruction mode	–	–	Helical Plus	Helical Plus	–	–
Additional filters	–	–	IQ Enhance OFF	IQ Enhance OFF	–	–
Approximate dose (for a 30 cm scan, average-size adult)	CTDIvol: 2.46 mGy Effective dose: 1.65 mSv	CTDIvol: 2.21 mGy Effective dose: 1.49 mSv	CTDIvol 4.87 mGy Effective dose: 3.27 mSv	CTDIvol: 3.38 mGy Effective dose: 2.27 mSv	CTDIvol: 3.5 mGy Effective dose: 2.35 mSv	CTDIvol: 2.4 mGy Effective dose: 1.61 mSv	CTDIvol: 2.4 mGy Effective dose: 1.61 mSv

CTDIvol, volume computed tomography dose index; DRI, dose right index ; SOV, scan field of view.