Since the invention of x-rays by Wilhelm Conrad Roentgen, rapid advances have been made in the radiological detection of body abnormalities. This was very evident in the 1960's and 70's when the marriage of computers to radiology gave birth to a new generation of imaging modalities such as computerized tomography, ultrasound, digital radiographic imaging, nuclear medicine, and nuclear magnetic resonance. Many of these devices employ digital computer techniques for signal manipulation, and the resultant analog diagnostic images are displayed on television monitors for viewing and on imaging cathode-ray tubes for a photographic hard copy.
Kenneth G. Lisk, Kenneth G. Lisk,
"SMPTE Test Pattern For Certification Of Medical Diagnostic Display Devices", Proc. SPIE 0486, Medical Imaging and Instrumentation '84, (28 August 1984); doi: 10.1117/12.943201; https://doi.org/10.1117/12.943201