増感紙とX線エネルギーによる写真コントラストの変化(第2報)

概要

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We investigated the differences in image contrast caused by intensifying screens. Five commercial screens with different phosphors and three kinds of objects were used in this experiment. A fluorescence meter was employed as a detector to measure the characteristics of screens only. Object's attenuation curves were measured to calculate the image contrast. As a result, attenuation curves for the same object differed according to the kind of screen resulting in a different image contrast. Contrast based on the screens with 37 to 50 keV K absorption edge were lower by a factor of about 10% compared to that of the calcium tungstate screen, in 60-1OO kV X-rays. These results showed no change in situation with and without scattered radiation. Image contrast due to screens is mainly caused by the differences in the K absorption energy of screen phosphors.
公益社団法人日本放射線技術学会の論文
1988-10-01