First off I don't see how you can compare a pat-down to a nude x-ray. If you have a choice, and a bomb shoved up your bum, obviously you are going to choose the pat-down (where the bomb shoved up your bum will not be detected). So I'm at a loss for how this would be effective at this point anyway.
Secondly, I don't care if my image is identifiable or not...I don't want anyone looking at me naked, full stop. And to be frank, I think the image is pretty identifiable. If the x-ray can outline your genitals and booty crack through your clothes, why would your exposed face not be identifiable (at least to some extent)? I bet your hubby could pick you out of a line-up. I'm all for security and keeping bombs off the streets and all that good jazz, but still...
I guess the next step is full body cavity searches for everyone...YAY!