Medical Imaging Timeline By mksmith327 Feb 19, 1896 Konrad Roentgen discovered the x-ray Feb 19, 1924 Hans Berger develops the electroencephalogram (EEG) Jun 19, 1949 Ultrasound Feb 19, 1955 First x-ray image intensifier allowed pick up and delivery of x-ray movies Feb 19, 1972 CT Scan Feb 19, 1975 PET Scan Feb 19, 1980 MRI Feb 19, 1985 Digital Imaging