TABLE I.

Scan protocols for phantom scans using the Philips Brilliance and the GE Discovery CT750 HD CT scanners. All protocols are helical scans.

Phantom insert	Protocol	Pitch	mA	Tube rotation time (s)	Filter	Slice thickness (cm)	DFOV (cm)	Recon kernel	CTDIvol (mGy)
Titanium geometric phantom	Philips 120 kVp	0.938	231	0.75	B	3.0	50	B	12.3
	GE 120 kVp	0.984	265	0.6	Medium	2.5	50	Standard	13.2
	GE gsi preset #41	0.984	360	0.6	Medium	2.5	50	Standard	13.1
Cerrobend geometric phantom	Philips 120 kVp	0.688	206	0.75	B	3.0	50	B	26.7
	GE 120 kVp	0.516	280	0.6	Medium	2.5	50	Standard	26.8
	GE gsi preset #32	0.516	375	0.6	Medium	2.5	50	Standard	26.4
Spine phantom	Philips 120 kVp	0.938	375	0.75	B	1.5	50	B	19.9
	GE 120 kVp	0.969	440	0.5	Medium	1.25	50	Standard	20.3
	GE gsi preset #35	0.969	630	0.5	Medium	1.25	50	Standard	20.2
Dental phantom	Philips 120 kVp	0.688	202	0.75	B	3.0	50	B	26.2
	GE 120 kVp	0.516	375	0.6	Medium	2.5	50	Standard	26.0
	GE gsi preset #32	0.516	290	0.6	Medium	2.5	50	Standard	26.4