Optimized protocol of multiple post-processing techniques improves diagnostic accuracy of multidetector computed tomography in assessment of small bowel obstruction compared with conventional axial and coronal reformations

Table 4 Inter- and intra-reader agreement (κ value) among three protocols for assessment of small bowel obstruction

Assessment parameter	Inter-reader agreement			Intra-reader agreement
	Protocol 1	Protocol 2	Protocol 3	Reader 1			Reader 2
	Reader 1-2	Reader 1-2	Reader 1-2	Protocol 1-2	Protocol 1-3	Protocol 2-3	Protocol 1-2	Protocol 1-3	Protocol 2-3
Presence or absence of SBO (n = 106)	0.902	0.897	0.966	0.866	0.902	0.964	0.933	0.897	0.967
Severity of obstruction (n = 106)	0.868	0.869	0.894	0.830	0.882	0.895	0.881	0.907	0.921
Obstruction site (n = 106)	0.873	0.926	0.925	0.855	0.890	0.925	0.908	0.870	0.963
Cause
No (n = 16)	0.902	0.897	0.966	0.866	0.902	0.964	0.933	0.897	0.967
Adhesions (n = 20)	0.725	0.820	0.820	0.725	0.786	0.759	0.820	0.820	1.000
Neoplasms (n = 11)	0.946	1.000	0.946	0.946	0.946	1.000	1.000	0.946	0.946
Intussusception
Neoplasms (n = 9)	0.927	0.935	0.935	0.863	0.927	0.935	0.863	0.935	0.935
Nonneoplasms (n = 5)	0.738	0.883	0.883	0.883	0.738	0.883	0.738	0.883	0.883
Volvulus (n = 8)	0.927	0.927	0.927	0.845	0.927	0.927	1.000	0.927	0.927
Hernias
Internal hernias (n = 6)	0.554	0.903	0.788	0.789	0.649	0.903	0.739	0.739	1.000
External hernias (n = 9)	0.935	0.935	1.000	0.935	1.000	0.935	0.935	0.935	1.000
Bezoars/stones (n = 7)	0.917	0.917	1.000	0.917	1.000	0.917	0.917	0.917	1.000
Vascular lesions (n = 8)	0.554	0.927	0.751	0.522	0.419	0.845	0.518	0.711	0.845
Inflammatory lesions (n = 7)	0.371	0.586	0.637	0.444	0.411	0.637	0.363	0.333	0.751
Total (n = 106)	0.733	0.861	0.848	0.748	0.760	0.848	0.772	0.797	0.924
Presence or absence of secondary bowel ischemia (n = 106)	0.572	0.863	0.840	0.675	0.645	0.795	0.690	0.696	0.863

SBO: Small bowel obstruction.