Table 8.

Maximum impact of technique parameter on test metrics for the DEQC body phantom (Protocol 1)

Test metric	Image type	Units	CTDIvol	Rotation time	Pitch	Image thickness
Iodine quant error 2 mg/mL	I(Wa)	mg/mL, %	0.22, 10.77%	0.11, 5.59%	0.03, 1.33%	0.02, 1.23%
Iodine quant error 5 mg/mL	I(Wa)	mg/mL, %	0.32, 6.35%	0.18, 3.70%	0.04, 0.85%	0.00, 0.01%
Iodine quant error 15 mg/mL	I(Wa)	mg/mL, %	0.16, 1.06%	0.10, 0.65%	0.02, 0.12%	0.16, 0.05%
Monoenergetic HU stability	50 keV	HU	14.45	8.26	0.16	0.11
	70 keV	HU	2.1	1.3	0.22	0.07
	110 keV	HU	5.79	2.86	0.4	0.04
	140 keV	HU	7.43	3.78	0.44	0.04
Noise	50 keV	HU	34.35	10.78	11.48	10.36
	70 keV	HU	16.51	5.06	6.22	5.62
	110 keV	HU	14.47	4.56	4.77	4.22
	140 keV	HU	13.55	4.35	4.32	3.76
	I(Wa)	mg/mL	5.43	1.77	1.61	1.39
	Wa(I)	mg/mL	12.81	4.22	3.81	3.21
Positional constancy	50 keV	HU	10.26	9.24	0.57	0.52
	70 keV	HU	0.89	0.22	0.25	0.12
	110 keV	HU	5.76	5.67	0.03	0.44
	140 keV	HU	7.04	6.91	0.08	0.52
	I(Wa)	mg/mL	0.36	0.34	0.01	0.02
	Wa(I)	mg/mL	8.85	8.68	0.14	0.67

Note: Values in bold were identified as statistically significant while those underlined were identified as both statistically and nominally significant.