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

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 [micro]m) 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.

Keywords

lasersko vzbujeno valovanje;agar gel;hitra kamera;laserska odklonska sonda;laser induced waves;high-speed camera;laser-beam-deflection probe;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 535(045)
COBISS: 15967771 Link will open in a new window
ISSN: 2156-7085
Views: 698
Downloads: 255
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Other data

Secondary language: Slovenian
Secondary 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;
Type (COBISS): Article
Pages: str. 1893-1905
Volume: ǂVol. ǂ9
Issue: ǂno. ǂ4
Chronology: Apr. 2018
DOI: 10.1364/BOE.9.001893
ID: 12783222