Shear wave generation from non-spherical bubble collapse in a tissue phantom

Abstract

Non-spherical collapse of cavitation bubbles generates shear waves in soft matter whose energy and propagation direction are related to the distance from a solid boundary.

High-speed ultrasound imaging of bubbly flows and shear waves in soft matter

“…Remarkably, this novel technique is capable of generating a stronger shear wave compared to previous methods that involved directly seeding the laser bubble inside the soft material. 14,21,22 The current approach also enables real-time evaluation of the effects of chemical reactions or biological processes on the samples, or changes due to humidity, temperature, and pressure in the sample.…”

“…Computing the particle displacement in high-speed USI is particularly useful for capturing the rapid dynamics of liquids and soft materials, 20 such as the measurements of transient shear wave propagation or the inertial collapse of a cavity. 14,21,22 In recent years this technique was implemented in numerous applications in medicine, including real time monitoring of the cardiac function, 23,24 analysis of vascular structures 20,25 or the detection of anomalies in biological tissue using elastography. 15,26 Yet, its utilization in the field of quantitative fluid mechanics is rather limited.…”

“…Specifically, we have utilized USI in these three distinct scenarios: (1) bubble jetting near the free surface of a liquid pool; 27 (2) dissolution of sub-micron laser-induced gas bubbles; 28,29 and (3) the propagation of shear waves in a soft material, namely industrial gelatin. 22,30–32…”