Ledley, Robert Steven

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Ledley, Robert Steven (1926– ) radiologist, inventor; born in New York City. He held a variety of research posts in government and academia before becoming a professor of radiology at the Georgetown University Medical Center in 1970. His pioneering work in the use of computers in medicine included the invention of the CT diagnostic X-ray scanner. The device made medical imaging and three-dimensional reconstructions possible, and led to improvements in radiation therapy for cancer patients.

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