I think there are many alternatives, starting with improvements to the current technology. I do research in related areas and am looking into some ideas along these lines. What is clear is that the current nude scanners were designed to get the information as simply as possible with little regard for passenger privacy issues and with less than optimal regard for radiation exposure, especially to those who fly all the time like the airline crews and frequent flyers. As a frequent flyer who works on various aspects of imaging technology I find this an interesting problem that is wide open for technological improvements. In an ideal world the technology would interface well with security intelligence.