診断領域における散乱 X 線のスペクトル的解析

概要

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For diagnostic X-ray images, the quantity of scattered radiation, which influences the image quality, is generally estimated in terms of the "scatter fraction". To improve the image quality, it is necessary to devise a way to decrease the influence of scattered radiation. For that purpose, one must have an understanding of the mechanism of influence on the images, together with the quantity that is expressed by scatter fractions. In the present study, by means of a Monte Carlo simulation, we calculated the energy spectra of the primary and scattered radiation, which was absorbed on the screen systems in radiography, and analyzed the influence of the scattered radiation. As a result, not only quantity, which is expressed by the scatter fractions, but also the spectrum make a difference to the influence of scattered radiation. Also, scatter fractions depend on exposure parameters and screen systems; however, mechanisms of dependence are different respectively.
社団法人日本放射線技術学会の論文
1992-10-01