Simulations were done for microbubble and nanoparticle using COMSOL, which is helpful to understand the in vivo activity of contrast agents for therapy and biomedical imaging.
Figure 3. Air bubble resonates at 1.65MHz, while lipid shell air bubble resonates at 5.45MHz.
Figure 4. Polymer-encapsulated air bubble resonates at 6.4MHz inside the blood vessel.