[New intensifying screens in clinical radiology. Paper I-Experimental investigations (author's transl)].

The degree of intensification and resolution was compared using rare-earth-screens and conventional calcium tungstate screens. -In order to approximate usual phantom (DIN 6, 815) was equipped with a lead grid at a depth of 6 cm. Nine screen-film combinations were exposed at 70 to 80 kv., using a 12-pulse generator and Bucky grid till blackening of S = 1 was obtained. -Resolution depends substantially on the inherent noise of the system and improves from 0.6 Lp/mm. for the most sensitive combinations (intensitification factor 8.0) to 1.15 Lp/mm (intensification factor 1.7). Compared with the standard combination with a resolution of about 0.9 Lp/mm., dose was reduced by more than 40% with an increase in resolution of 45% (combination 3M-Trimax A4/XD).