I read it a bit quick and saw "rapescan" ... probably more apt.
In all seriousness though, the only way these images can be in anyway 'erotic' for anyone is if they see the person before they go through the scanner and can then associate real person with the ghostly naked image then produced.
If the person looking at images is sitting in a closed room and just sees the ghost pictures, I don't see how it can be a turn-on to even the biggest perv. Do it on on a computer isolated from the network and internet and wipe it at the end of each day, and I have no issue. Especially if it speeds up security.
I'd much rather this than the collection of my thumb print and iris scan for all eternity by the US authorities.