Radiology, Vol 139, 707-714, Copyright © 1981 by Radiological Society of North America
Effect of crossover exposure on radiographic image quality of screen- film systems
K Doi, LN Loo, TM Anderson Jr and PH Frank
Modulation transfer functions (MTFs), Wiener spectra, and H & D curves
of conventional and anticrossover screen-film systems were measured in an
evaluation of the potential clinical use of anticrossover systems. The
relative speed of anticrossover (3M) systems was reduced by 40%, compared
with conventional (Kodak OG) systems. The anticrossover system improved
both resolution and noise properties of screen-film systems (55%
improvement of MTF at 2 cycles/mm and 40% reduction of radiographic mottle
at low spatial frequencies) in a way that a combination of slow, sharp
screens with conventional film may not accomplish, even when the speeds of
different systems are matched. Detail visibility, in phantom images and
radiographs of the hand, was considerably enhanced with anticrossover film
compared with that of conventional film.
