Robert S. Ledley, 86, a dentist turned biomedical researcher and computing trailblazer who invented the first CT scanner capable of producing cross-sectional images of any part of the human body, died Tuesday in Kensington, Md.
The cause was Alzheimer's disease, his son Fred said.
Nearly every field of medicine has been affected by the whole-body CT scanner, short for computerized tomography.
Robert Steven Ledley was born on June 28, 1926, in the Queens borough of New York City. After receiving his D.D.S. from New York University in 1948, he enrolled as a graduate student at Columbia to study physics. He received his master's degree in physics in 1950. His professors included the Nobel Prize winners Enrico Fermi, Hans Bethe, and I.I. Rabi.