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A Rayleigh-Plesset-like equation is derived that describes the radial oscillation of an encapsulated microbubble between two elastic walls, assuming that the microbubble is attached to one of them. The obtained equation is then used in numerical simulations in order to establish how the presence of the opposite wall affects the resonance properties and the scattered echo of the encapsulated microbubble...
We investigated gas release from two hard-shelled ultrasound contrast agents by subjecting them to high-mechanical index (MI) ultrasound and simultaneously capturing high-speed photographs. At an insonifying frequency of 1.7 MHz, a larger percentage of contrast bubbles is seen to crack than at 0.5 MHz. Most of the released gas bubbles have equilibrium diameters between 1.25 and 1.75 /spl mu/m. Their...
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