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

Citation Author(s):
Saber
Izak Ghasemian
Fabian
Reuter
Yuzhe
Fan
Georg
Rose
Claus-dieter
Ohl
Submitted by:
Saber IZAK
Last updated:
Mon, 07/08/2024 - 15:58
DOI:
10.21227/vyyg-k610
License:
0
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Abstract 

Elastography is a non-invasive technique to detect tissue anomalies via the local elastic modulus using shear waves. Commonly shear waves are produced via acoustic focusing or the use of mechanical external sources, shear waves may result also naturally from cavitation bubbles during medical intervention, for example from thermal ablation. Here, we measure the shear wave emitted from a well-controlled single laser-induced cavitation bubble oscillating near a rigid boundary. The bubbles are generated in a transparent tissue-mimicking hydrogel embedded with tracer particles. High-speed imaging of the tracer particles and the bubble shape allow quantifying the shear wave and relate it to the bubble dynamics. It is found that different stages of the bubble dynamics contribute to the shear wave generation and the mechanism of shear wave emission, its direction and the efficiency of energy converted into the shear wave depend crucially on the bubble to wall stand-off distance.

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