Radiology, Vol 152, 187-193, Copyright © 1984 by Radiological Society of North America
Dose efficiency of screen-film systems used in pediatric radiography
G Cohen, LK Wagner, DL McDaniel and LH Robinson
Twenty-one screen-film systems were examined using contrast-detail-dose
methods in order to determine which were most dose-efficient for use in
pediatric radiography. With a given screen, dose efficiency in the
noise-limited region (contrast approximately equal to 0.05) was more or
less constant (within the range of experimental error) with changes in film
speed. When screens with decreased phosphor thickness were used, dose
efficiency deteriorated markedly. For a given speed of up to two times Par,
rare-earth phosphors offered no advantage over calcium tungstate systems
with regard to low-contrast dose efficiency; however, they did increase the
speed of the system. Anti-crossover film proved to be an effective means of
improving high-contrast detail while maintaining low-contrast dose
efficiency.
