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Fig 4. ROC curves using VASOTumor or VASORatio. The sensitivity and specificity (in fractions) in terms of distinguishing grade II from higher-grade (grade III and grade IV) tumors are plotted at different thresholds. If the 2 categories have identical distributions of the VASO parameters, the ROC curve would have been a 45° straight line (dotted line). The AUCs are 0.974 and 0.985 for VASOTumor and VASORatio, respectively.
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