The ability of operators to view actual physical parts of the body was removed long ago. All that shows up is a stick figure and a highlight on areas that need to be checked.
I'm pretty sure they still do see your entire body, just not the people at the checkpoint doing the actual pat down.
My understanding was that the scanner sends the full body images to a remote screen in an office where the operator selects any areas of interest which will flash up on the 'generic body outline' than you and the screening point guys see.