An<unk>  <unk>  is an<unk><unk>  that converts X-rays into visible light at higher intensity than the more traditional fluorescent screens can. Such<unk> s are used in X-ray<unk> ng systems (such as fluoroscopes) to allow low-intensity X-rays to be converted to a conveniently bright visible light output. The device contains a low absorbency/scatter input window, typically aluminum, input fluorescent screen, photocathode, electron optics, output fluorescent screen and output window. These parts are all mounted in a high vacuum environment within glass or more recently, metal/ceramic. By its intensifying effect, It allows the viewer to more easily see the structure of the object being<unk> d than fluorescent screens alone, whose<unk> s are dim. The<unk>  requires lower absorbed doses due to more efficient conversion of X-ray quanta to visible light. This device was originally introduced in 1948.
X-ray image intensifier
X-ray vision
Digital X-ray radiogrammetry
X-ray marker
Medicine chest 
Medicine chest
Respiratory examination
Triangle of auscultation