Comparison of tissue optical properties for localized and homogeneous model of light absorption by blood

A simple procedure based on the introduction of characteristic times of involving heat transfer processes and geometrical dimensions of the problem is proposed to analytically study light and heat propagation through multicomponent biological tissues irradiated by an external light pulse. The procedure enables one to explicitly analyze the effects of all optical and thermal parameters of the problem. The proposed model of the parameters is discussed and critically compared with published data. The simulations can be easily generalized to include multilayered tissue structure and blood perfusion rate into consideration. Sample examples are given to illustrate spatial and temporal temperature distributions over tissue depth.