Dear all, I am thankful to you all; I want to ask i have data in pixels of regions, i want to convert it to the mm or cm. But for calibration factor i need mm/totalpixel . here i have totalpixel but nw from where i can get total mm length of dicom?

Please read full text as am working on the image processing feature extraction using region props and i get result in pixels and want to convert these pixel data into mm or cm . I need some calibration factor as i read comments here but for that i need cal_factor=(mm/pixelsize). here how can i get mm for calibration factor ? any suggestion please. my image resolution is 512x512, and pixel spacing is 0.9770, 0.9770. Help me to convert it to mm.