title: Sequential trials with new rare-earth intensifying screens.
abstract: Sequential analysis of idential radiographs with calcium tungstate (CaWO4) and rare-earth intensifying screens was performed in four test situations. Most preferences in the direction of rare-earth screens were due to motion unsharpness with CaWO4 screens. Better contrast was found with rare-earth screens in one test situation in spite of low kVp exposures. Assessment of the quality of the radiographs in practical situations gave results which differed to a certain extent from what might be expected from the technical assessment of the properties of the screens.
mesh_terms: D005373:Film Dosimetry; D005682:Gadolinium; D006615:Hip / Q000000981:diagnostic imaging; D006801:Humans; D006811:Humerus / Q000000981:diagnostic imaging; D007811:Lanthanum; D011829:Radiation Dosage; D011856:Radiographic Image Enhancement / Q000379:methods*; D014567:Urography / Q000379:methods; D014953:Wrist / Q000000981:diagnostic imaging
chemical_list: D007811:Lanthanum; D005682:Gadolinium