Who discovered and pioneered the use of CT scans?

Dr. Allan M. Cormack (1924–1998) and Godfrey N. Hounsfield (1919–2004) independently discovered and developed computer assisted tomography in the early 1970s. They shared the 1979 Nobel Prize in Physiology or Medicine for their research. The earliest computer-assisted tomography was used to examine the skull and diseases of the brain.