DETERMINATION OF THE TEMPERATURE FIELD DURING LASER COAGULATION of CHORIORETINAL COMPLEX WITH OPTOACOUSTIC IN VITRO
| Autor: | A. V. Ardamakova, N. A. Fedoruk, A. P. Lytkin, A. V. Larichev, V. I. Siplivyy |
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| Jazyk: | ruština |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Сибирский научный медицинский журнал, Vol 38, Iss 4, Pp 44-48 (2019) |
| Druh dokumentu: | article |
| ISSN: | 2410-2512 2410-2520 |
| DOI: | 10.15372/SSMJ20180406 |
| Popis: | The article describes a determination method of the laser radiation with specific parameters effect on the eye tissues based on optoacoustic probing. Low-power probing laser with 7-10 ns pulses generates acoustic waves at the aiming point. The waves propagate through the medium (saline in a cuvette) to acoustic receiver. The characteristics of the acoustic wave give basis for estimation of optical absorption coefficient - a parameter that determines temperature in the affected area after applying therapeutic laser. Calculation of the temperature pattern was performed using a three-dimensional thermal conductivity model that enabled determination of temperature distribution at any local point during coagulation and immediately after. To compare the results with pre-calculated temperature field values, direct temperature measurement was taken from the surface of the absorbing layer. The experiment was performed on six human chorioretinal tissue samples in vitro; the obtained optical absorption coefficient values did not exceed 120-300 cm-1 with maximum error margin of 20 %. The computational model was seen to be in good agreement with experimental thermocouple measurements. |
| Databáze: | Directory of Open Access Journals |
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