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

Table 5 Interobserver agreement analysis of subjective quality scores between two radiologists for 40-70 keV virtual monoenergetic images and polyenergetic images (n = 157)

Subjective quality scores			Doctor B
			3	4	5	κ	P value
Doctor A	PEIs	3	14	0	0	0.913	< 0.001
		4	2	130	2
		5	0	0	9
	40 keV VMIs	3	0	0	0	0.812	< 0.001
		4	0	15	2
		5	0	4	136
	50 keV VMIs	3	0	0	0	0.813	< 0.001
		4	0	18	2
		5	0	5	132
	60 keV VMIs	3	2	1	0	0.766	< 0.001
		4	1	32	5
		5	0	9	107
	70 keV VMIs	3	11	0	0	0.789	< 0.001
		4	0	107	4
		5	0	11	24

SNR: Signal-to-noise ratio; PEI: Polyenergetic image; VMI: Virtual monoenergetic image.