POSTMORTEM INTERVAL ESTIMATION BY THE METHOD OF WAVELET ANALYSIS OF STOKES-POLARIMETRIC MAPPING DATA OF HUMAN VITREOUS BODY LAYERS

Abstract

The aim: To develop a set of forensic criteria for determining PMI on the basis of complex selective statistical data analysis of magnitude distributions of the wavelet-amplitude coefficients of VB polycrystalline films microscopic images. Materials and methods: The object of study are polycrystalline films of VB, taken from 41 cadavers of both sexes aged from 37 to 79-year with pre-known time of death coming ranged from 3 to 36 h. Measuring the coordinate allocation meanings of parameters of polarization in the points of microscopic images was carried out at the location of the standard Stokes-polarimeter. Results: The magnitudes of statistical moments of the 1st-4th orders linearly vary within 36 hours. It was revealed that the data of time changes of the asymmetry and the excess are the most sensitive to necrotic changes in the polycrystalline structure of such samples. Conclusions: The scale-selective approach provides an increase in the range of sensitivity up to 36 h and increase the accuracy of the PMI estimation up to 45 min.