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Microbubbles insonified by ultrasound show nonlinear oscillation and reflect waves including harmonic and subharmonic signals. Subharmonic imaging can be more useful, though occurrence conditions of subharmonics are not clarified enough. In this study, we investigated effects of microbubble interaction on occurrence of subharmonics. The interaction depends on the distance between two microbubbles...
Coated microbubbles used as ultrasound contrast agents show complicated nonlinear oscillation if insonified. The Marmottant model assumes the experimental surface tension that changes with the bubble radius. Though this model has been widely used in recent years, its physical background is still unclear. In this work, we focused on the molecular level state of the membrane of a coated microbubbles...
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