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FIG 3. Pixel-based ROC curves for ADC, ADC ratio, and signal intensity ratio differentiate infarct growth and final infarct from normal tissue. Areas under the curves for signal intensity ratio were largest in predicting infarct growth (0.705) and final infarct (0.841), and the area under the curve for ADC ratio was slightly larger than that for the absolute ADC value in predicting infarct growth (0.609 vs 0.567) and final infarct (0.760 vs 0.743). Curves did not show that these three values were highly accurate in differentiating infarct growth from normal tissue; each parameter is worse than in the prediction of final infarct. Curves did show that the signal intensity ratio was better than the ADC or ADC ratio for predicting infarct growth or final infarct.
