Diagnostic accuracy of dual-layer spectral computed tomography virtual monoenergetic imaging with multiplanar reformation for T-staging of colorectal cancer

Table 6 Interobserver agreement for T-staging assessments between two radiologists for 40-70 keV virtual monoenergetic images and polyenergetic images (n = 157)

	Images	T staging	Doctor B
			T1	T2	T3-4	κ	P value
Doctor A	Axial PEIs	T1	2	0	0	0.891	< 0.001
		T2	1	29	3
		T3-4	0	2	123
	OA PEIs	T1	2	0	0	0.899	< 0.001
		T2	1	33	2
		T3-4	0	3	116
	40 keV OA VMIs	T1	15	0	0	0.943	< 0.001
		T2	1	14	2
		T3-4	0	0	125
	50 keV OA VMIs	T1	13	0	0	0.924	< 0.001
		T2	2	15	2
		T3-4	0	0	125
	60 keV OA VMIs	T1	4	1	0	0.843	< 0.001
		T2	2	21	3
		T3-4	0	2	124
	70 keV OA VMIs	T1	3	0	0	0.906	< 0.001
		T2	1	27	3
		T3-4	0	1	122

PEI: Polyenergetic image; VMI: Virtual monoenergetic image; OA: Oblique axial.