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 5 Detection rates for assessment parameters among three protocols for assessment of small bowel obstruction n (%)

Assessment parameter	Protocol 1			Protocol 2			Protocol 3			P-value
	Reader 1	Reader 2	P-value	Reader 1	Reader 2	P-value	Reader 1	Reader 2	P-value
Presence or absence of SBO
Presence (n = 90)	85 (94.4)	87 (96.7)	0.469	89 (98.9)	87 (96.7)	0.312	88 (97.8)	88 (97.8)	1.000	0.378
Absence (n = 16)	15 (93.8)	14 (87.5)	0.544	15 (93.8)	16 (100)	0.310	15 (93.8)	16 (100)	0.310	0.430
Obstruction site
No (n = 16)	15 (93.8)	14 (87.5)	0.544	15 (93.8)	16 (100)	0.310	15 (93.8)	16 (100)	0.310	0.430
Proximal (n = 9)	8 (88.9)	7 (77.8)	0.527	9 (100)	8 (88.9)	0.303	8 (88.9)	8 (88.9)	1.000	0.570
Middle (n = 37)	34 (91.9)	33 (89.2)	0.691	34 (91.9)	35 (94.6)	0.643	35 (94.6)	34 (91.9)	0.643	0.775
Distal (n = 44)	40 (90.9)	41 (93.2)	0.694	43 (97.7)	43 (97.7)	1.000	42 (95.5)	43 (97.7)	0.557	0.160
Total (n = 106)	97 (91.5)	95 (89.6)	1.000	101 (95.3)	102 (96.2)	1.000	100 (94.3)	101 (95.3)	1.000	0.129
Cause
No (n = 16)	15 (93.8)	14 (87.5)	0.544	15 (93.8)	16 (100)	0.310	15 (93.8)	16 (100)	0.310	0.430
Adhesions (n = 20)	18 (90.0)	19 (95.0)	0.548	19 (95.0)	20 (100)	0.311	19 (95.0)	20 (100)	0.311	0.434
Neoplasms (n = 11)	10 (90.9)	11 (100)	0.306	11 (100)	11 (100)	1.000	11 (100)	10 (90.9)	0.306	0.597
Intussusception
Neoplasms (n = 9)	7 (77.8)	8 (88.9)	0.527	9 (100)	8 (88.9)	0.303	8 (88.9)	9 (100)	0.303	0.414
Nonneoplasms (n = 5)	4 (80.0)	4 (80.0)	1.000	5 (100)	4 (80.0)	0.292	4 (80.0)	5 (100)	0.292	0.749
Volvulus (n = 8)	7 (87.5)	8 (100)	0.302	7 (87.5)	8 (100)	0.302	8 (100)	7 (87.5)	0.302	1.000
Hernias
Internal hernias (n = 6)	4 (66.7)	3 (50.0)	0.558	6 (100)	5 (83.3)	0.296	5 (83.3)	5 (83.3)	1.000	0.045a
External hernias (n = 9)	9 (100)	8 (88.9)	0.303	8 (88.9)	9 (100)	0.303	9 (100)	9 (100)	1.000	0.595
Bezoars/stones (n = 7)	7 (100)	6 (85.7)	0.299	6 (85.7)	7 (100)	0.299	7 (100)	7 (100)	1.000	0.592
Vascular lesions (n = 8)	3 (37.5)	4 (50.0)	0.614	8 (100)	7 (87.5)	0.302	6 (75.0)	7 (87.5)	0.522	0.004b
Inflammatory lesions (n = 7)	6 (85.7)	6 (85.7)	1.000	6 (85.7)	5 (71.4)	0.515	6 (85.7)	5 (71.4)	0.515	0.857
Total (n = 106)	90 (84.9)	91 (85.8)	1.000	100 (94.3)	100 (94.3)	1.000	98 (92.5)	100 (94.3)	1.000	0.001b
Presence or absence of secondary bowel ischemia
Presence (n = 38)	28 (73.7)	27 (71.1)	1.000	36 (94.7)	35 (92.1)	0.644	34 (89.5)	36 (94.7)	0.395	0.001b
Absence (n = 68)	65 (95.6)	67 (98.5)	0.308	65 (95.6)	66 (97.1)	0.647	66 (97.1)	65 (95.6)	0.647	0.928

^aP < 0.05,

^bP < 0.01. SBO: Small bowel obstruction.