Fig. 2

ROC curve of metrics performed in different groups analysis of parotid tumors. a ROC curves illustrated the accuracy of MRI with cutoff values entropy TTP > 3.21 and kurtosis MRE > 4.47 alone and combined them in the differential diagnostics of parotid malignancies and benign tumors. b ROC curves illustrated the accuracy of MRI with cutoff values of 10th MRE < 75.67%, skewness TTP ≥ − 0.06 and 10th WOR ≥ 7.35 l/s alone combined them in the differential diagnostics of Warthin’s tumors from other tumors. c ROC curves illustrated the accuracy of MRI with cutoff values 10th TTP < 84.92 s and skewness MRE ≥ 1.00 in the differential diagnostics of parotid malignancies and benign tumors except Warthin’s tumors