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The possibility of the fluorescence spectroscopy for diagnosing a pathology in human tissues is studied now very intensively. However, there are not much and good theoretical models to calculate the fluorescence intensity in scattering and absorbing non-homogeneous biological tissues. Moreover, such models are needed for up-to-date laser medical non-invasive diagnostic equipment and technique which run by principle of an inverse optical task solution. In order to obtain the acceptable model we used the Transport equation and multi-layered plane medium. The Method of Moments was used to solve the Transport equation with calculation of the moment of fluorescence flux at the last step of the solution.

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Laser optical information technology and devices implementing this technology have been developed since the 1970s. Corresponding apparatuses are widely used in therapy of oncological patients. Apparatuses based on semiconductor lasers are progressing particularly rapidly [1 5]. The energy and spectral parameters of semicon ductor lasers have been recently upgraded. The output power of commercial semiconductor IR lasers is 5 W. Their spectral range has been extended to 1.7 1.8 µm.