HOUSTON --Both major airports in Houston will get advanced imaging technology units to screen passengers. The Houston Airport Systems says they are getting six of the screeners as early as this fall. Four screeners will be put into use at Bush Intercontinental and two at Hobby Airport. The machines were installed at Bush a few months ago as part of a pilot program, but they have since been removed. The Department of Homeland Security said 28 airports, in addition to 11 identified in March, will get the AIT units. Advanced imaging technology is designed to bolster security by safely screening passengers for metallic and non-metallic threats, including weapons, explosives and other objects concealed under layers of clothing. The Transportation Security Administration ensures passenger privacy through the anonymity of AIT images, blurring all images and permanently deleting those images immediately after they're viewed by a TSA employee.