Diffusion-weighted magnetic resonance imaging without bowel preparation for detection of ulcerative colitis

Table 1 Accuracy of diffusion-weighted imaging hyperintensity from different b values for detecting endoscopic inflammation

	AUROC	Sens.	Spec.	P value
b = 400 s/mm2	0.631	69.0	48.3	0.0410
b = 600 s/mm2	0.732	81.7	62.1	0.0001
b = 800 s/mm2	0.867	93.0	79.3	0.0001
b = 1000 s/mm2	0.721	64.8	79.3	0.0010

AUROC: Area under the receiver operating characteristic curve; Sens.: Sensitivity; Spec: Specificity.

Table 2 Accuracy of the MR-score-S and seven signs for detecting endoscopic inflammation

ROC analysis	AUROC	Sens.	Spec.	P value
MR-score-S > 11	0.929	85.9	82.8	0.0001
DWI hyperintensity	0.867	93.0	79.3	0.0001
Rapid gadolinium enhancement after intravenous contrast medium administration	0.853	73.2	93.1	0.0001
Bowel wall thickening	0.793	66.2	89.7	0.0001
Differentiation between the mucosa-submucosa complex and the muscularis	0.842	80.3	86.2	0.0001
Parietal edema	0.684	43.7	89.7	0.0040
Ulceration	0.775	59.2	93.1	0.0001
Comb sign	0.694	43.7	93.1	0.0020

¹Cut-offs defined by ROC analysis. AUROC: Area under the receiver operating characteristic curve; Sens.: Sensitivity; Spec: Specificity; DWI: Diffusion-weighted imaging.

Table 3 Correlation of MR-score-T or Baron-T with clinical and biological markers

Activity markers	MR-score-T		Baron-T		MR-score-T vs Baron-T
	r	P value1	r	P value1	P value2
Mayo index	0.831	0.0001	0.926	0.0001	0.20
CRP	0.656	0.0020	0.886	0.0001	0.07
ESR	0.748	0.0001	0.810	0.0001	0.64
Hemoglobin	-0.449	0.0470	-0.580	0.0070	0.60
Leukocytes	0.481	0.0320	0.506	0.0230	0.92
Platelets	0.445	0.0490	0.534	0.0150	0.73
Serum iron	-0.497	0.0260	-0.559	0.0100	0.80
Albumin	-0.462	0.0400	-0.507	0.0220	0.86

¹Spearman’s rank correlation test;

²Comparison of correlation coefficients.