[The effect of technical parameters on diagnostic quality].

By means of ROC (receiver operating characteristic) concept the importance of film density, film view, and film view time is determined for radiographs of different organs and symptoms considering the quality of diagnosis. On example of MTF (modulation transfer function) an organ specific optimization of X-ray imaging systems is realized. A recommendation is given for the application of screen-film systems with regard to noise, image contrast, and X-ray tube voltage.