“…Moreover, the vaporization of microdroplets is of interest for embolotherapy applications 171,190 . Recently, Shpak et al 175 showed that the vaporization of droplets with ultrasound frequencies in the MHz range is induced by the focusing of superharmonic waves, generated by nonlinear propagation of the ultrasound, with wavelengths of the order of the droplet size. The peak negative pressure in the focal region is droplet size and frequency dependent, in other words the vaporization efficiency is governed by a strong coupling between droplet size and the pressure and frequency of the ultrasound wave.…”