[Wiener spectra of roentgen film-screen combinations]

Radiographic noise of screen-film combinations used in medical diagnostics can be described quantitatively by means of a power spectrum (Wiener spectrum) by which the quantum mottle can be mathematically expressed. The authors present a measurement method for power spectra and the results obtained with several screen-film combinations. The influence of various parameters on the spectra is discussed, such as sensitivity, transfermodulation film-function, and noise.