Spectral control by light interaction with soft biological tissues for light-therapy purposes

Abstract

A review of authors-designed techniques for increasing light power, absorbed by various tissue chromophores, via the optimal selection of the wavelength irradiating skin surface is given. The techniques are based on the simulation of light transfer through biotissues with accounting for the optical tissue model in the wavelength range of 300 to 1000 nm. Light-oxygen and photodynamic effects as well as photodissociation of blood oxyhemoglobin are considered as the subjects of the optimization. It enables the absorbed light power to be increased up to several times by the proper choice of the wavelength. These photo-induced mechanisms of the light action are widely used for various non-invasive light-therapy methods, so that the proposed spectral control algorithms tissues can be easily implemented in various fields of practical medicine.