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Fig. 3B —Receiver operating characteristic (ROC) curves. ROC curves show power of choline-citrate (Cho/Cit) ratio alone (dashed line), apparent diffusion coefficient (ADC) alone (dotted line), and combination of the two (solid line) as predictors of tumor at histology when voxels containing 30% tumor as defined by tumor regions of interest on T2-weighted images are considered positive (A) and when voxels containing 70% tumor are considered positive (B).