I would opt out of the ones that use X-rays. Yes I know that the radiation they emit is supposedly low.

However I am not willing to gamble my life on the bet that some person that I don’t know at the TSA has set the machine up correctly, that they haven’t malfunctioned since the last person went in, that they were calibrated and tested properly on that day etc.

At least if you go through a CAT scan in a hospital, supposedly trained workers operate those units and they are not used in such a heavy duty fashion.

I still can’t figure out why they did not just use the millimeter wave machines which would have been a lot safer, even if malfunction happened.

I don’t have any issues with nude photos or intrusive pat downs. They are just annoyances that I am willing to go through to catch the underwear bomber!