Distribution of Thermal Radiation Resulting From the Laser Diode into Biological Tissue PDF

Keywords

Photothermal Therapy, Laser Irradiance, Biological Tissue, Liode Laser Irradiation,

Abstract

Tissue surface temperature distribution on the treatment site can serve as an indicator for the effectiveness of a photothermal therapy. In this paper, thermal effects of laser irradiance on biological tissue is investigated using finite difference (Euler forward method) to solve bioheat transfer equation, to find the temperature spread in the each layer of tissue in terms of depth and also to know the temperature distributed within a specified time. Numerical solution gives 2D and 3D simulation for temperature distribution during diode laser irradiation of tissue. By consider A cylindrical sample of biological tissue (tumor) irradiated by diode laser of wavelength 808 nm and power 1 w. optimal absorption coefficient was also identified to increase the effectiveness of heat treatment, this is done by inject the biological tissue with absorbent material to light or Photo sensitizer(as cardiogreen), temperatures were compared in terms of depth of tissue in tow cases : natural tissue and tissue injected by Photo sensitizer. These results can be used to control the laser treatment parameters and to optimize the treatment outcome.