Medical Imaging By cpayne Jan 1, 1800 Thermography Invented Period: Jan 1, 1800 to May 3, 2010 Medical Imaging May 3, 1805 Endoscopy Invented Jan 1, 1895 X-Ray Invented May 3, 1933 Electron Microscopy Invented Jan 1, 1958 PET Scan Invented Jan 1, 1959 Ultrasound Invented Jan 1, 1972 CT Scan Invented Jan 1, 1974 MRI Invented