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 allowable dose. >> the well-publicized images we saw of patients who got ct scans of their brain who had hair loss in a very clear distribution, that was the area with a lot of repetitive imaging where the doses get up very high. basically, the hair cells got destroyed by the radiation. >> the fallout from that dangerously high amount of radiation wasn't just hair loss. donald, michael, and suzanne have to worry that all that radiation could give them cancer. if possible, instead of a ct scan get an ultrasound or an mri