Comparisons of image quality and estimations of dose reductions were m
ade for several new screen-film combinations including conventional an
d rare-earth systems under conditions similar to abdomen radiography.
The evaluation was carried out using an ANSI type phantom and the TOR(
CDR) image quality object developed by the University of Leeds. The pa
rameters employed for the comparison were: entrance dose, high and low
contrast threshold sensitivity and resolution. The advantages and lim
itations of the method are also discussed. Results show that images wi
th high quality can be obtained with comparatively low patient doses,
and that there are still wide differences in image quality for similar
speed systems, depending on the manufacturer and on the chosen combin
ation.