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Figure 3. Graphs showing the correlation between parameters calculated from the post-treatment dynamic contrast-enhanced magnetic resonance imaging(DCE-MRI) data and the percentage of residual viable cancer determined by histopathology on the excised mass for breast tumours treated by MRI-guided focused ultrasound surgery (MRIgFUS): increase in signal intensity (ISI) for (a) all patients (r = 0.749) and (b) patients who had their post-treatment evaluation at least 7 days after treatment (r = 0.962); positive enhancement integral (PEI) for (c) all patients (r = 0.778), and (d) patients who had their post-treatment evaluation at least 7 days after treatment (r = 0.934). Points corresponding to patients whose post-treatment was performed 3 days after MRIgFUS are shown as asterisks (*) in (a) and (c).