Monochromatic energy computed tomography image for active intestinal hemorrhage: A model investigation

Table 2 Comparison of contrast to noise ratios values of the exudation regions at each energy level and blood flow rate between portal venous phase and arterial phase

	PVP	AP	t	P value
40 keV	19.35 ± 10.89	7.69 ± 6.68	-2.4151	0.036
50 keV	20.82 ± 11.26	8.78 ± 7.21	-2.380	0.035
60 keV	20.63 ± 10.07	8.83 ± 6.75	-2.575	0.024
70 keV	15.65 ± 8.17	5.93 ± 4.46	-2.762	0.017
80 keV	10.46 ± 5.83	3.44 ± 2.41	-2.945	0.012
90 keV	7.33 ± 3.92	2.31 ± 1.52	-3.157	0.008
100 keV	5.83 ± 2.70	1.49 ± 1.01	-3.996	0.004
Mixed-energy image	11.68 ± 6.38	3.58 ± 2.09	-3.189	0.015
F	18.298	7.823
P value	0.000	0.000

¹Using Satterthwaite’s approximate t test. No significant difference between 40, 50, 60 and 70 keV in the portal venous phase (PVP), but the difference was significant when compared with the polychromatic energy imaging (P < 0.05). No significant difference between 40, 50 and 60 keV in the arterial phase (AP), but the difference was significant when compared with the polychromatic energy imaging (P < 0.05).