Detection of small hepatocellular carcinoma: Comparison of dynamic enhancement magnetic resonance imaging and multiphase multirow-detector helical CT scanning

Table 1 Area under the ROC curve and P value for MRI and MDCT in detecting HCC

	Observer 1		Observer 2
Imaging techniques	Az value	95% CI	Az value	95% CI
MDCT	0.983	0.950-1.013	0.99	0.968-1.012
MRI	0.951	0.901-1.001	0.94	0.882-0.999
t value	-0.425		-0.956
P value	0.672		0.348

Table 2 Sensitivity and positive predictive value for MRI and MDCT in detecting small HCC n (%)

		Sensitivity(%)			Positivepredictivevalue (%)
ImagingTechnique		≤1 cm	> 1 cm ≤3 cm	Total
		SHCC	SHCC	SHCC
		n = 20	n = 23	n = 43	n = 43
Observer	MDCT	19 (95.0)	22 (95.7)	41 (95.31)	97.6
1	MRI	17 (85.0)	22 (95.72)	39 (90.7)	90.7
Observer	MDCT	18 (90.0)	21 (91.31)	39 (90.79)	97.5
2	MRI	14 (70.0)	22 (95.7)	36 (83.7)	94.7