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Figure 4. Receiver operating characteristic curves for the increase in signal intensity(ISI) parameter calculated from the dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) data for (a) 26 tumours analysed 3–14 days after the MRI-guided focused ultrasound surgery (MRIgFUS) and (b) 20 tumours analysed 7–14 days after the MRIgFUS. The areas under the curves were (a) 0.853 and (b) 0.986 and the p-values for asymptotic significance were (a) 0.005 and (b) 0.001. A significant improvement is obtained when only data for patients examined 7 days or more after MRIgFUS are considered.
