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A theoretical approach to the calculation of the image of an inhomogeneity in transillumination of tissue like media using polarized radiation is developed in the approximation of the basic polarization modes. The method is based on the solution of the nonstationary transfer equation in the Fokker-Planck approximation. An expression for the edge spread function of the image of a totally absorbing half plane is derived. A generalization to the image profile of inhomogeneity that represents a finite width stripe is pre sented. The spatial resolution (sharpness) and contrast of image are analyzed at various time intervals of detection. The image parameters are compared for the polarization difference technique and imaging in unpolarized light. It is demonstrated that the imaging using the difference of linear polarizations is similar to the imaging using the pulsed unpolarized radiation with a detection interval of about z/2c (z is the thickness of the sample and c is the velocity of light). The results are in agreement with the experimental data on the differential polarization transillumination of tissue like media.

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