Comparative evaluation of several rare-earth film-screen systems

Comparisons of image quality were made for several rare-earth film-screen combinations under conditions similar to those used in chest radiography. The characteristic curve, modulation transfer function, and Wiener spectrum were measured. Observer response studies were carried out to compare the limits of perceived resolution. Signal-to-noise considerations based on the measured characteristics favor a fast film-show screen pair over a slow film-fast screen pair, consistent with the observer study results. The interrelationship of the physical parameters in determining image quality and the limitations of the method are discussed.