This paper reports on studying changes of DNA content in rat's brain cells by image analysis in order to find out an objective and quantitative standard for the estimation of early postmortem interval Fifteen rat's were execute follwed by collection of brain cells per hour at the period of 24 hours After death after that,cell smears made,fixed with the formalin and stained with Feulgen's method The integral optical density parameter and average gray level parameter of cell DNA were measured with auto ...