The scanners at PDX are millimeter wave scanners (http://en.wikipedia.org/wiki/Millimeter_wa… ), not the backscatter x-ray Rapiscan machines. Only the Rapiscan machines are being phased out. While the millimeter wave scanners don't have the same health concerns, they do have the same privacy issues.
Will they still get to feel my balls if I opt-out? (Wait, will I need to opt-out?)