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Figure 4: Typical MRI for normal animals (upper) as well as animals after 10-day (middle) and 17-day (bottom) tumor implantations. (a) Contrast-enhanced T1 images before and after FUS exposure. (b) T2 images (after FUS). (c) R1 maps before and after FUS exposure. (d) Area under the R1 curve over 80 minutes (denoted as ) before and after FUS exposure.