Figure 1.

Experimental diagrams for the in vitro characterization of the effects of radiation force on microbubbles. A: System used to determine the relationship between microbubble translational velocity and output pressure from the transducer. B: System used to examine the effects of secondary radiation force on contrast agents after making contact with the tube wall. In panel A, the optical axis is along the x direction, the acoustic axis is along the z direction and the microbubble flow axis is along the y direction. Similarly, in panel B, the optical axis and the acoustic axis are along the z direction and the microbubble flow axis is along the y direction.