From what I remember about these latest scanners, they do not retain the image like a computer does, rather, the image clears every time someone is cleared and passes through.
If anyone objects to the scanner, such as a parent who objects to their child being scanned, or a pregnant woman, they can request a hand frisking. Don't know if I fancy some hairy arsed Group 4 employee shoving their hands down my trousers though.
I wonder if the scanner is powerful enough to see through a prosthesis, such as a hollow false leg, or would they have to be removed for closer inspection, while the unfortunate owner jigs around like a hop scotch player.
It may be that these security measures are a necessary evil and are going to be implemented, whether the travelling public it or not.
Personally, I don't give a dam, bring em on.