Fig. 2.

A. Temporal distribution of the scattering intensity of DBs formed by IC of the microbubbles. The black dots are the experimentally-measured scattering intensity in one period of the multiple tone bursts ultrasound. The gray curve is the scattering intensity fitted by an exponential equation with three parameters. B. Theoretical dissolution curves for sulfur hexafluoride bubbles with different initial radii. C. Theoretical dissolution model for determining the residual radius of the dissolving bubble at a certain time point. D. (Black solid curve) the change of the theoretically calculated scattering intensity with the bubble radius. (Red dotted line) the change of the fitted scattering intensity with the bubble radius by exponential function. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)