New whole-body imaging machines to show outlines only

The Transportation Security Administration is installing technology in some US airports to allow travellers to go through checkpoint security with a generic outline of the body instead of a naked body image.

The agency says the change is intended to protect privacy rights while securing commercial air travel.

It will be used in 40 airports, including Chicago, Illinois; Dallas, Texas; Detroit, Michigan; Miami, Florida; and Newark, New Jersey.

The whole-body imaging machines have sparked outrage among some passengers and privacy campaigners.