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

Table 3 Comparison of image quality scores at each energy level and blood flow rate between portal venous phase and arterial phase

	PVP	AP	t	P value
40 keV	4.63 ± 0.58	3.46 ± 1.43	1.9991	0.081
50 keV	4.46 ± 0.65	3.06 ± 1.20	2.724	0.018
60 keV	4.20 ± 0.77	2.97 ± 1.26	2.195	0.049
70 keV	3.54 ± 0.91	2.23 ± 0.92	2.692	0.020
80 keV	3.00 ± 0.83	1.97 ± 0.87	2.263	0.043
90 keV	2.46 ± 0.55	1.49 ± 0.49	3.494	0.004
100 keV	2.26 ± 0.54	1.09 ± 0.11	5.6501	0.001
Mixed-energy imaging	3.60 ± 1.13	2.46 ± 1.06	1.953	0.074
F	52.549	19.875
P value	0.000	0.000

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