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Droplets, Bubbles and Ultrasound Interactions.

Oleksandr Shpak¹, Martin Verweij², Nico de Jong^2,3

¹Physics of Fluids Group, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, 217, Enschede, 7500 AE, The Netherlands.

Advances in Experimental Medicine and Biology

|October 22, 2015

Summary

Perfluorocarbon liquid droplets offer a new generation of ultrasound contrast agents, converting into gas bubbles for targeted medical applications like drug delivery and tumor imaging. Their dynamics and interaction with ultrasound are explored, detailing phase-transition and acoustic properties.

Keywords:

Droplet Microbubble Ultrasound

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Area of Science:

Acoustics and Biomedical Engineering
Materials Science and Nanotechnology

Background:

Microbubbles are established ultrasound contrast agents for medical imaging and therapy.
Perfluorocarbon liquid droplets present a novel alternative, transforming into microbubbles via ultrasound activation.
These droplets offer potential for advanced applications including drug delivery and enhanced high-intensity focused ultrasound (HIFU).

Purpose of the Study:

To elucidate the fundamental principles of bubble and droplet dynamics under ultrasound influence.
To detail the acoustic properties and behavior of perfluorocarbon droplets for medical applications.
To explore the physics of ultrasound propagation, bubble scattering, and droplet phase-transition dynamics.

Main Methods:

Analysis of bubble dynamics using the Rayleigh-Plesset equation and linearization for small amplitude oscillations.
Examination of ultrasound propagation characteristics: speed of sound, nonlinearity, and attenuation.
Investigation of droplet-ultrasound interactions, including focusing, shaking, and phase-conversion.

Main Results:

Characterization of bubble resonance frequency, damping, and quality factor.
Discussion of the impact of bubble coating and effective surface tension on dynamics.
Elucidation of ultrasound scattering by bubbles and droplet behavior under acoustic waves.

Conclusions:

Perfluorocarbon droplets demonstrate significant potential as next-generation ultrasound contrast agents.
Understanding droplet and bubble dynamics is crucial for optimizing their use in targeted therapies and diagnostics.
The study provides a foundational analysis of acoustic interactions for advanced biomedical applications.