増感紙・フィルム系の非対称性による画質特性

概要

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We studied the asymmetry of screen-film systems for some combinations between screen and tube voltage using symmetric films with crossover factors near-zero and 0.26. Our results showed that gradient values might be changed, when different kinds of screens were used front and back. When we used the same-speed screens in the fronts and backs and increased the tube voltage, the gradient of the system became higher ; but when we used different speed screens in the frot and back, the gradient of the system became lower. And the total modulation transfer function (MTF) of the output side was decreased as increasing the tube voltage with the effect due to K-X-ray, but the gradient. On the density region, the total MTF of the output side was changed, when different kinds of screens were used front and back, but was not changed when the same kind of screens were used.
社団法人日本放射線技術学会の論文
1996-05-20