Figure 5.

Measurements of the focal displacement as a function of the acoustic power during sonication in the silicone phantom from experimental group 2. At the five lowest powers tested, a linear dependence was observed. Inset: At the two highest powers tested, a large increase in displacement was observed, which was correlated with changes in the phantom that were seen after the experiments. Sonicating at 4.1 W after these higher power sonications yielded a larger displacement than previous sonications at this power. Dotted lines show linear regression of the data at the different imaging orientations (R²=0.99 for both).