That is exactly what it was. Freeze the body in a block of gelatin, slice/grind a layer off, polish, snap a picture, repeat. The process reduces the body to a powder.
It used a blade to scrape the millimeter off, then a technician with a scalpel would cut things like tendons every couple millimeters....ohh, and no polishing, they just spritzed each layer with a blue dye before taking a picture.
5 for this becomming absolutely pointless less than 5 years later thanks to MRIs