Vladimir V. Barun and Arkady P. Ivanov, Institute of Physics, Belarus
The angular patterns of radiance factors of light reflected by rough skin surface with large-scale inhomogeneities are studied on the base of the analytical solution to the Maxwell equations for illumination by a directional beam from outside and inside of biotissue under an arbitrary incidence angle. The surface relief parameters are selected to be typical for the skin of a person. The polar and azimuthal structures of radiance factors are computed with accounting for mutual shadowing by relief elements. The calculated angular patterns are treated from a viewpoint of the distribution function of micro areas normals over directions. Light reflection by a surface is shown to be essentially non-Lambertian, especially for inclined illumination. The derived analytical relations can be easily incorporated into any computation scheme of light fields in biological tissues and out of them. The obtained results can be used for solving direct and inverse problems of biomedical optics, in particular, for the derivation of light penetration depths into biotissues, the investigation of action spectra for tissue chromophores, the design of methods for diagnosing structural and biophysical tissue parameters, the optimization of light-tissue interaction mechanisms under non-invasive illumination through skin.
Mr. Vladimir Barun
Institute of Physics, Researcher
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