ROC curves use maximum FA (A, cutoff value = 0.17, sensitivity = 92%, specificity = 77.8%), FA range (B, cutoff value = 0.0971, sensitivity = 96%, specificity = 77.8%), and maximum SD (C, cutoff value = 0.0492, sensitivity = 100%, specificity = 100%) to differentiate grade II from grade III and IV gliomas.