DETERMINATION OF THE TEMPERATURE FIELD DURING LASER COAGULATION of CHORIORETINAL COMPLEX WITH OPTOACOUSTIC IN VITRO

DETERMINATION OF THE TEMPERATURE FIELD DURING LASER COAGULATION of CHORIORETINAL COMPLEX WITH OPTOACOUSTIC IN VITRO

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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 BOOKS 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 Collaborations 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.