Analysis of the detective quantum efficiency of a radiographic screen-film combination.
Detective quantum efficiency provides a useful measure of the imaging efficiency of imaging systems. Methods for measuring the exposure and the spatial-frequency dependence of the contrast transfer function, the noise power spectrum, and the detective quantum efficiency are developed for x-ray imaging systems. These are applied to a high-resolution screen-film combination exposed to a 30-kV-peak x-ray spectrum. The major component sources of screen-film noise in this system are identified and quantified. These are interpreted in terms of a simple model to predict the screen-film noise power spectrum and detective quantum efficiency. Reasonable agreement is found between model predictions and experimental measurements.
D000818:Animals; D004560:Electricity; D006801:Humans; D008962:Models, Theoretical; D013679:Technology, Radiologic / Q000295:instrumentation / Q000592:standards*