Airport body scanners that produce graphic images of travelers' bodies will be removed from checkpoints by June, the Transportation Security Administration says, ending what critics called virtual strip searches." Passengers will continue to pass through machines that display a generic outline of the human body, raising fewer privacy concerns. The TSA move came after Rapiscan, the manufacturer of the 174 so-called "backscatter" machines, acknowledged it could not meet a congressional-ordered deadline to install privacy software on the machines. "It is big news," said Marc Rotenberg, executive director of the Electronic Privacy Information Center. "It removes the concern that people are being viewed naked by the TSA screener." Currently, the TSA uses the 174 backscatter machines in 30 airports, and has another 76 units in storage. It uses millimeter wave machines in 170 airports. The decision to remove the backscatter machine will make moot, at least temporarily, travelers' concerns about the health effects of the machines. Backscatter machines use X-rays, while millimeter wave machines use radio waves. The TSA has long maintained both machines are safe, but recently signed an agreement with the National Academy of Sciences to study the scanners. The study will continue even though the machines are being pulled, the TSA said, because they could be reintroduced in the future.