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

Table 1 Comparison between the four experimental groups

Group	TB I (N = 21)	TB II (N = 17)	BT I (N = 37)	BT II (N = 26)	P-value
Sex	Men: 15 (71%)	Men: 9 (53%)	Men: 26 (70%)	Men: 10 (38%)	0.043⁺
Age (years)	66.43 ± 17.38	66.94 ± 16.37	57.49 ± 13.84	62.85 ± 15.22	0.089
Heart rate (beats/min)	82.43 ± 21.86	80.76 ± 17.84	78.92 ± 17.11	74.81 ± 14.50	0.495
Systolic BP (mmHg)	128.57 ± 25.39	137.88 ± 24.79	143.86 ± 28.79	144.85 ± 26.89	0.148
Diastolic BP (mmHg)	80.67 ± 14.83	81.94 ± 15.69	88.68 ± 19.70	85.46 ± 9.36	0.248
BMI (kg/m²)	23.61 ± 2.84	24.05 ± 5.36	25.38 ± 3.79	24.59 ± 3.22	0.345
PA density (HU)	358.26 ± 104.29	295.89 ± 84.39	324.03 ± 99.90	285.19 ± 108.70	0.078
Aorta density (HU)	173.62 ± 69.70	186.58 ± 57.53	285.18 ± 64.99	294.78 ± 64.48	< 0.001
Radiation dose (mSv)	8.49 ± 4.18	8.65 ± 5.33	11.85 ± 5.55	9.07 ± 3.44	0.023⁺

Bold text indicating a statistically significant difference with a P-value less than 0.05
N: number; TB: test bolus; BT: bolus-tracking; BP: blood pressure; BMI: body mass index; PA: pulmonary artery
⁺ No statistically different in post hoc analysis using Scheffe method

ISSN: 1471-2342