The signal strength of detected backscattered X-rays from a known position then allows a highly realistic image to be reconstructed.
In the case of airline-passenger screening, the image is of the traveler's nude form.
An important benefit of the switch to all-digital broadcasting is that parts of the valuable broadcast spectrum have been freed up for public safety communications by groups such as police, fire departments and rescue squads.
Also, some of the spectrum has been auctioned to companies that will be able to provide consumers with advanced wireless services, such as wireless broadband.
The image resolution of the technology is high, so the picture of the body presented to screeners is detailed enough to show genitalia.
These images are not necessarily temporary - screeners can save the body images to the system's hard disk or floppy disk for subsequent viewing on either "the system monitor or on any IBM compatible personal computer with color graphics." The Transportation Security Administration claims that is not storing detailed images of passengers screened by the system.
The Transportation Security Administration utilizes two technologies to capture naked images of air travelers - backscatter x-ray technology and millimeter wave technology.
In 1895 x-rays This discovery of how to look through an object to observe details beneath has advanced to include new techniques.
Some of these proposals, such as improved training for airport screeners, checking all bags for bombs, strengthening cockpit doors, and placing air marshals on flights, do not implicate privacy interests and are sound security measures.
EPIC said that the program is "unlawful, invasive, and ineffective." EPIC argued that the federal agency has violated the Administrative Procedures Act, the Privacy Act, the Religious Freedom Restoration Act, and the Fourth Amendment.
EPIC cited the invasive nature of the devices, the TSA's disregard of public opinion, and the impact on religious freedom.
However, these machines, which show detailed images of a person's naked body, are equivalent to a "digital strip search" for all air travelers.
This proposal, along with the agency's controversial plan to profile air travelers, shows extraordinary disregard for the privacy rights of air travelers.