DOINA GAZDARU*, CLAUDIA CHILOM*, MIHAELA ANTONINA CĂLIN**, CĂTĂLIN GEANTĂ* AUREL POPESCU*

*Department of Electricity and Biophysics, Faculty of Physics, University of Bucharest
**National Institute of Research and Development for Optoelectronics INOE 2000, Bucharest

In this paper we shall approach only interaction of laser radiations with highly scattering and/or absorbing biological materials (i.e., opaque materials). The photon multiple scattering by cells and tissues is approached from the perspective of the general propagation theory (i.e., simple diffusion) of a particular physical magnitude, provoked by its conjugated gradient. In this way, one can obtain, in a particular case, the analytic expression of fluence rate for the isotropic tissues. The propagation theory is also conducting to the model of heat transfer (i.e., spatial-temporal evolution of the temperature) in the adjacent regions of target in which the laser absorbed energy was converted in heat.

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