BioMed Research International / 2014 / Article / Tab 4

Clinical Study

CT Perfusion in the Characterisation of Renal Lesions: An Added Value to Multiphasic CT

Table 4

ROC analysis.
(a) ROC analysis using difference between normal cortex and tumoural PS values

Oncocytomas versus MHLsOncocytomas versus all MLs

Area under ROC curve0.85 (C.I. 0.59–1)0.85 (C.I. 0.60–1)
Threshold value(s)NC PS-tumour PS >2.5NC PS-tumour PS >2.5
Sensitivity100%100%
Specificity66.67%66.67%
Accuracy94.87%95.92%

(b) ROC analysis using absolute enhancement in corticomedullary phase

Oncocytomas versus MHLsOncocytomas versus all MLs

Area under ROC curve0.79 (C.I. 0.61–0.96)0.83 (C.I. 0.69–0.97)
Threshold value(s)<160<160
Sensitivity93.94%95.35%
Specificity50%50%
Accuracy87.18%89.80%

Results of ROC curve analysis in predicting RCCs in relation to oncocytomas using difference in PS values and absolute enhancement in corticomedullary phase. PS: permeability surface; MHLs: malignant hypervascular lesions; MLs: malignant lesions; NC PS: normal cortex permeability surface.

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