[The influence of different parameters for roentgenologic recognition of disseminated lung diseases (author's transl)].

The influence and diagnostic value of different film blackness, of different consideration times and of different layer angles for the diagnostic quality in disseminated lung diseases was examined by using the ROC-conception. The results of these examinations show, that variation of film blackness by +/- 25% have no influence of the diagnostic quality. Longer consideration times have a higher diagnostic accuracy than short consideration times. Moreover we found, that radiography, produced with lower layer angles, for example the zonography, allow a higher diagnostic accuracy than tomograms, which were produced with a great layer angle.