title: Plain radiography with a rare-earth screen: comparison with calcium tungstate screen.
abstract: Plain radiographic examinations were performed on 388 patients (adult and pediatric) using either a calcium tungstate or rare-earth screen. Radiographs were compared for overall image quality, mottle, contrast, density, and detail. The rare-earth screen produced radiographs with significantly more mottle than did the standard screen. However, this was almost never of diagnostic importance. A small but significant decrease in overall image quality also was found with the rare-earth screen. This was the result of minor differences between the grading of optimal and good. A major advantage of rare-earth screens is a 50% or more reduction in radiation exposure. The results here show that rare-earth screens may be used in plain radiographic examinations without a clinically important decrease in image quality.
mesh_terms: D000328:Adult; D017610:Calcium Compounds; D002648:Child; D006801:Humans; D007811:Lanthanum; D008674:Metals, Rare Earth; D011835:Radiation Protection / Q000295:instrumentation; D011858:Radiographic Magnification / Q000295:instrumentation*; D014414:Tungsten; D017973:Tungsten Compounds; D014963:X-Ray Intensifying Screens
chemical_list: D017610:Calcium Compounds; D008674:Metals, Rare Earth; D017973:Tungsten Compounds; D007811:Lanthanum; C018858:calcium tungstate; D014414:Tungsten