Figure 3a. ROC curves for left (LH) and right (RH) hemispheres in subject 2 at (a) 1.5-T and (b) 3.0-T MR imaging, derived according to examination visit. Solid lines represent visit 1 and dashed lines represent visit 2. FPR = false-positive rate, TPR = true-positive rate. (c) ROC curves for subject 2 at 4.0-T MR imaging.