The COBRA by Analogic uses 3-D imaging
Another technology commonly found in hospitals but also in airports is Analogic’s COBRA machines. These machines provide 3-D images of bags and automatically detect any possible security threats or illegal substances. With the COBRA, laptops and liquids don't have to be removed from bags, reducing bottlenecks in the lines. The company claims they can screen at least 550 bags per hour.
Read more: http://www.digitaljournal.com/life/travel/tsa-looking-into-new-technology-for-faster-airport-screenings/article/467089#ixzz4B3xMssjY