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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
Laloš, Jernej (Avtor), Gregorčič, Peter (Avtor), Jezeršek, Matija (Avtor)

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Izvleček
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.

Jezik:Angleški jezik
Ključne besede: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
Vrsta gradiva:Članek v reviji (dk_c)
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FS - Fakulteta za strojništvo
Leto izida:2018
Št. strani:Str. 1893-1905
Številčenje:Vol. 9, no. 4
UDK:535(045)
ISSN pri članku:2156-7085
DOI:10.1364/BOE.9.001893 Povezava se odpre v novem oknu
COBISS.SI-ID:15967771 Povezava se odpre v novem oknu
Avtorske pravice: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).
Število ogledov:270
Število prenosov:158
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Gradivo je del revije

Naslov:Biomedical optics express
Skrajšan naslov:Biomed. opt. express
Založnik:Optical Society of America
ISSN:2156-7085
COBISS.SI-ID:24857383 Povezava se odpre v novem oknu

Gradivo je financirano iz projekta

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Številka projekta:P2-0392
Naslov:Optodinamika

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede: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

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