Fluoroscopic screens

Fluoroscopic screens allow direct examination of X-ray images by the eye. (Zn, Cd)S Ag is used almost exclusively (molar ratio of ZnS CdS, 60 40 particle size 20-40 pm). The emission spectrum corresponds well to the spectral sensitivity of the eye. 

The fluoroscopic screen consists of a substrate (cardboard, plastic sheet), which is first covered with a reflective layer of MgO or TiOz. The phosphor layer is applied by pouring, after dispersion in a binding agent based on acetylcellulose. 

Fluoroscopic screens Intensifying screens Image intensifier screens Radiographic image screens... 

X-ray intensifying screens are used in radiological diagnosis and in industrial non-destructive testing. X-ray fluoroscopic screens are used mainly in health examinations and in radiological examination of luggage... 

Radiography using barium sulfate is called a barium swallow or a barium enema. Barium suliate is mixed with water into a slurry (mtxmre) that looks and tastes like ground-up chalk. The patient swallows the dense mixture. A doctor or nurse then holds a fluoroscope over the patient s abdomen. The fluoroscope emits X rays that show up on a television screen. 

FIGURE 29.15 Screen display of a fluoroscopy-based navigation system during intramedullary nail distal locking. The windows show AP and lateral fluoroscopic x-ray images with the tool (solid line) and its extension (dotted line). The goal is to align the tool with the nail s hole axis. (Photo Courtesy ofL. P. Nolte.)... 

G.I. Series (Fluoroscopic Examination Of The Digestive Tract). This diagnostic procedure is used to detect various abnormalities of the gastrointestinal tract by means of fluoroscopy, which consists of the placing of the patient between a source of x rays and a fluorescent screen that displays a picture of the organs outlined by the x rays. Usually, a series of photographs are taken of various parts of the digestive tract. There are two types of G.l. series. 

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