A practical biphasic contrast media injection protocol strongly enhances the aorta and pulmonary artery simultaneously using a single CT angiography scan

Table 2 Comparison between the BT and traditional groups

Group	Traditional (Aorta scan)	Traditional (PA scan)	BT I	BT II	Test of homogeneity of variances	ANOVA P-value
Sex	M:21(53%)		M:26(70%)	M:10(38%)	0.004
Age (years)	73.35 ± 18.22		57.49 ± 13.84	62.85 ± 15.22	0.311	< 0.001
PA density (HU)	195.33 ± 71.44	302.20 ± 86.37	324.03 ± 99.90	285.19 ± 108.70	0.014
Aorta density (HU)	234.95 ± 94.18	165.68 ± 80.95	285.18 ± 64.99	294.78 ± 64.48	0.005
Radiation dose (mSv)	20.07 ± 7.78		11.85 ± 5.55	9.07 ± 3.44	0.029

Group	Traditional versus BT I	Traditional versus BT II	BT I versus BT II
Post hoc analysis using the Games-Howell method (p-value)
Sex	0.380	0.682	0.061
Radiation dose (mSv)	< 0.001	< 0.001	0.079

Group	T_Ao versus T_PA	T_Ao versus BT I	T_Ao versus BT II	T_PA versus BT I	T_PA versus BT II	BT I versus BT II
PA density (HU)	< 0.001	< 0.001	0.003	0.737	0.907	0.479
Aorta density(HU)	0.004	0.038	0.017	< 0.001	< 0.001	0.938

Bold text indicating a statistically significant difference with a P-value less than 0.05
PA: pulmonary artery; BT: bolus-tracking; ANOVA: Analysis of variance; T_Ao: Traditional(Aorta scan); T_PA: Traditional(PA scan)

ISSN: 1471-2342