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

Table 1 Comparison of detection rates for the region of contrast agent exudation between spectral computed tomography and multidetector row computed tomography in different phases

Grouping	Detection result		Total	Detection rate	χ2	P value
	Detected	Not detected
64-slice CT in the AP	23	12	35	65.71%	5.185	0.023
spectral CT in the AP	31	4	35	88.57%
64-layer CT in the PVP	32	3	35	91.43%	1.3931	0.238
spectral CT in PVP	35	0	35	100.00%

¹Represent χ² correction. 64-layer computed tomography (CT) in arterial phase (AP) and portal venous phase (PVP), χ² = 6.873, P = 0.009; spectral CT in AP and PVP, χ² corrected = 2.386, P = 0.122.