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SPEED CHARACTERISTICS OF MODERN SCREEN-FILM SYSTEMS : THE IMPORTANCE OF INTERVAL MEASUREMENTS OF ABSOLUTE SPEEDS

1995; Japan Radiological Society; Volume: 51; Issue: 4 Linguagem: Inglês

10.6009/jjrt.kj00001353670

1881-4883

Noboru Katsuda, Yuichi Shirakawa, Yoshiharu Higashida, Masahiro Hatemura, Nobuyuki Moribe, TAKAO TAKADA, Akiyoshi Otsuka,

Surface Roughness and Optical Measurements

We have measured both the absolute and relative speeds of modern blue and green screen-film systems to investigate the interval change in speeds of screen-film system. The absolute speeds of the modern green systems were comparable or slightly lower to those of the older systems. However, the absolute speeds of the blue systems were reduced by about 20-40% over the past ten yers. We have concluded that the absolute speed measurement of screen-film systems is significant for detecting the interval change in system speeds. Generally, the relative speeds and speed indices of screens measured had good correlation.