The article describes a determination method of the laser radiation with specific parameters effect on the eye tissues based on FOIE GRAS 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 Skin and Wound 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.