Abstract
We developed a new method for the fabrication of hollow microcapsule blowing the vapor of moisture curing polymer into water as microbubbles. The fabricated hollow microcapsules have biocompatible shells and are smaller than blood capillaries. Thus, the acoustic behavior of such microcapsules was observed ultrasonically and optically in the flow channel. These experimental results revealed that such microcapsules have the transportability of adhering materials on the surface and can be used in ultrasound imaging.