This device was built by scientists at the Brookhaven Lab in 1961. Its main function was to detect brain tumors using positron emission. Initially, the headgear would only show the location of the tumors as raw data, but a decade later, researchers found a way to convert that data into actual images of the brain. By 1980, doctors could now observe brain function utilizing modern PET machines developed through extensive research done on the pre-PET headgear.