The signal-to-noise ratio and the modulation transfer function of a screen-film system, are measured with a coherent optical processor. On the basis of the analysis of the noise in this type of imaging systems, the average number of photographic grains per X-ray converted in the screen was deduced, and a satisfactory agreement with the current data was obtained. It was found, moreover, that the fluctuations in the number of grains obey Poisson statistics. From the measured quantities, the detective quantum efficiency of the screen-film system was obtained as a function of the spatial frequency
Measurement of the detective quantum efficiency of an X-ray screen-film system
GAMBACCINI, Mauro;RIMONDI, Otello
1982
Abstract
The signal-to-noise ratio and the modulation transfer function of a screen-film system, are measured with a coherent optical processor. On the basis of the analysis of the noise in this type of imaging systems, the average number of photographic grains per X-ray converted in the screen was deduced, and a satisfactory agreement with the current data was obtained. It was found, moreover, that the fluctuations in the number of grains obey Poisson statistics. From the measured quantities, the detective quantum efficiency of the screen-film system was obtained as a function of the spatial frequencyFile in questo prodotto:
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