The ultrasound-induced formation of bubble clusters may be of interest as a therapeutic
means. If the clusters behave as one entity, ie, one mega-bubble, its ultrasonic manipulation
towards a boundary is straightforward and quick. If the clusters can be forced to accumulate
to a microfoam, entire vessels might be blocked on purpose using an ultrasound contrast
agent and a sound source. In this paper, we analyse how ultrasound contrast agent clusters
are formed in a capillary and what happens to the clusters if sonication is continued, using …