TSA officials say the system comes with privacy protections. Officers reviewing the images don't interact with passengers, or even see them. They sit in a separate area, look at the pictures on a monitor and push a button to either clear travelers or alert security about a suspicious item.
Images will not be recorded or stored. Passenger faces are blurred to further protect their identities.
For now, the scans will also be voluntary. Flyers selected for a secondary screening after passing through the metal detectors will have the option of stepping into the wave scanner, rather than undergoing a physical pat-down.
"We're giving people a choice," said TSA spokeswoman Lara Uselding.
Barry Steinhardt, director of the American Civil Liberties Union's program on technology and liberty, said he nevertheless had concerns.
"The images that I've seen are quite revealing," he said. "I guarantee you that as this gets more commonly used, you'll be seeing these images on the Internet."