20.500.12556/RUL-126295 Observation of laser-induced elastic waves in agar skin phantoms using a high-speed camera and a laser-beam-deflection probe 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. 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 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 true false true Angleški jezik Slovenski jezik 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). Članek v reviji 2021-04-15 11:16:53 2021-04-15 11:17:01 2023-05-30 03:27:12 0000-00-00 00:00:00 2018 0 0 Str. 1893-1905 no. 4, art. 319600 Vol. 9 Apr. 2018 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 535(045) 2156-7085 10.1364/BOE.9.001893 15967771 RAZ_Lalos_Jernej_2018.pdf RAZ_Lalos_Jernej_2018.pdf 1 060B2F55BC0948D327F4D2E82E34A685 86152ae0a47abf07b29145e9f4ea10cf5e9d164ccf23474b682b65136e31dd7b e16c99df-a1bb-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=142196 https://www.osapublishing.org/boe/fulltext.cfm?uri=boe-9-4-1893&id=384033 1 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=142195 Fakulteta za strojništvo 0 0 0