Apparatus for reducing the effect of x-ray statistical noise and electronic noise in a fluorographic system that displays an x-ray image on a television screen. Analog video signals based on the x-ray image are amplified logarithmically and digitized to yield live pixel signals. Processed pixel signals...http://www.google.com/patents/US4367490?utm_source=gb-gplus-sharePatent US4367490 - Noise reduction in digital fluoroscopy systems
