Figure 6.

(A-C) Thermal lesions created by 10 minute ablations at 12.5 acoustic W/cm² in porcine muscle positioned directly atop bovine bone, shown in central cross sections through the lesions. The catheter was measured as 15.2, 19.7, and 32.3 mm away from the bone before heating in A-C respectively, and 11.5, 17, and 32 mm away from the bone after the experiment. The catheter track is circled, and the side of the tissue that was against the bone is shown against the table. In C, a metal rod illustrates the catheter position. (D-F) The experiments were modeled with the applicator 15, 20, and 32 mm away from the bone, respectively, and the results after a 10 minute ablation are plotted in the central plane between the two transducers. The resulting temperature profiles produced by Model A are shown in a color map (°C). A black line indicates the bone/muscle boundary, and curves outline the 52°C temperature contours for Models A-D.