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Observation of laser-induced elastic waves in agar skin phantoms using a high-speed camera and a laser-beam-deflection probe
ID Laloš, Jernej (Author), ID Gregorčič, Peter (Author), ID Jezeršek, Matija (Author)

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Abstract
We present an optical study of elastic wave propagation inside skin phantoms consisting of agar gel as induced by an Er:YAG (wavelength of 2.94 µm) laser pulse. A laser-beam-deflection probe is used to measure ultrasonic propagation and a high-speed camera is used to record displacements in ablation-induced elastic transients. These measurements are further analyzed with a custom developed image recognition algorithm utilizing the methods of particle image velocimetry and spline interpolation to determine point trajectories, material displacement and strain during the passing of the transients. The results indicate that the ablation-induced elastic waves propagate with a velocity of 1 m/s and amplitudes of 0.1 mm. Compared to them, the measured velocities of ultrasonic waves are much higher, within the range of 1.42-1.51 km/s, while their amplitudes are three orders of magnitude smaller. This proves that the agar gel may be used as a rudimental skin and soft tissue substitute in biomedical research, since its polymeric structure reproduces adequate soft-solid properties and its transparency for visible light makes it convenient to study with optical instruments. The results presented provide an insight into the distribution of laser-induced elastic transients in soft tissue phantoms, while the experimental approach serves as a foundation for further research of laser-induced mechanical effects deeper in the tissue.

Language:English
Keywords:laser induced waves, agar gel, high-speed camera, laser-beam-deflection probe, medical optics and biotechnology, laser induced ultrasonics, imaging systems, image recognition, algorithms and filters, cameras, lasers, erbium
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Publication status:Published
Publication version:Version of Record
Year:2018
Number of pages:Str. 1893-1905
Numbering:Vol. 9, no. 4, art. 319600
PID:20.500.12556/RUL-126295 This link opens in a new window
UDC:535(045)
ISSN on article:2156-7085
DOI:10.1364/BOE.9.001893 This link opens in a new window
COBISS.SI-ID:15967771 This link opens in a new window
Copyright:
V članku navedeno: "© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement"; https://www.osapublishing.org/library/license_v1.cfm (15. 4. 2021).
Publication date in RUL:15.04.2021
Views:1974
Downloads:341
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Record is a part of a journal

Title:Biomedical optics express
Shortened title:Biomed. opt. express
Publisher:Optica
ISSN:2156-7085
COBISS.SI-ID:24857383 This link opens in a new window

Secondary language

Language:Slovenian
Keywords:lasersko vzbujeno valovanje, agar gel, hitra kamera, laserska odklonska sonda, medicinska optika in biotehnologija, lasersko induciran ultrazvok, slikovni sistemi, prepoznavanje slik, algoritmi in filtri, kamere, laserji, erbij

Projects

Funder:ARRS - Slovenian Research Agency
Project number:P2-0392
Name:Optodinamika

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