Abstract: Time profiles of picosecond Nd:YAG-laser radiation transmitted through homogeneous and inhomogeneous scattering models of biological objects contrasted by new dyphtalocyanine dyes have been investigated. These dyes have specially synthesized as the contrasting substances for biological tissues in order to increase signal-to-noise ratio in optical image processing. By using this dye contrasting technique the ratio improvement has been demonstrated in time-resolved experiments on determination of inner details for some model biological objects.!5
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