Photoacoustic viscoelastic testing of soft tissues using annular beam illumination

Zijie Zhao; Jun Zou

doi:10.1117/12.2649316

9 March 2023 Photoacoustic viscoelastic testing of soft tissues using annular beam illumination

Zijie Zhao, Jun Zou

Proceedings Volume 12379, Photons Plus Ultrasound: Imaging and Sensing 2023; 123791K (2023) https://doi.org/10.1117/12.2649316
Event: SPIE BiOS, 2023, San Francisco, California, United States

Conference Poster

Abstract

This paper reports a new photoacoustic (PA) excitation method for evaluating the shear viscoelasticity of soft tissues. By illuminating the target surface with an annular pulsed laser beam, circularly converging surface acoustic waves (SAWs) are generated and detected at the center of the annular beam. The shear elasticity and viscosity of the target are extracted from the dispersive phase velocity of the SAWs based on the Kelvin-Voigt model and non-linear regression fitting. Agar phantoms with different concentrations and animal liver and fat tissue samples have successfully been characterized. Different from previous methods, the self-focusing effect of converging SAWs allows sufficient signal-to-noise ratio (SNR) to be obtained even with low laser energy density, which makes this approach well compatible with soft tissues.

Citation Download Citation

Zijie Zhao and Jun Zou "Photoacoustic viscoelastic testing of soft tissues using annular beam illumination", Proc. SPIE 12379, Photons Plus Ultrasound: Imaging and Sensing 2023, 123791K (9 March 2023); https://doi.org/10.1117/12.2649316

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