>> we place drapes over the entire area to keep it sterile. mistakes can be made very rarely when you have draping that obscures the mark. >> in the u.s. seven patients every day suffer body part mix-ups. just before surgery make sure you confirm with the nurse and the surgeon the correct body part and side of your operation and don't be shy about doing it. at number 5 radical radiation. this isn't a bad haircut. it's the damage done by too much radiation. michael heuser goes in for a ct scan of his head. clumps of hair fall out. suzanne sloan, same thing. and same for donald biggles. >> i had a perfect ring around my head. >> here's how their hair falls out. the hospitals programmed the ct scanner wrong and repeatedly scanned these patients with monster doses of radiation. michael gets eight times the