増感紙のX線エネルギー有効利用に関する研究

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In the process of producing X ray images, intensifying screens obviously play a major role in determining the image quality and the X ray dose received by the patient. Unfortunately, however, no obtained quantitative study has been done to determine whether X rays radiated from an X ray tube are effectively utilized. In the present study, from the viewpoint that the X ray utilization efficiency of intensifying screens is identical with that of the radiography system used, the X ray absorption and transmission of phantoms, contrast media and intensifying screens at different X ray tube voltages with various additional filters were investigated. Also, a systematic analysis of the process by which X rays radiate from an X ray tube and become useless after passing through each type of absorbing material was conducted using X ray spectra, and the importance of intensifying screens as a radiography system was described. It was found that in screen-film systems, which have recently become very diverse, the K absorption edge of the phosphor used in intensifying screens is quite important as a factor affecting the radiographic contrast because of its combined effect with the contrast medium, and that the application of intensifying screens should be selected by considering the tube voltage, the part of the body examined and the contrast medium used. Furthermore, as a method for decreasing the X ray dose, which is as important as the image quality, the X ray absorption of intensifying screens must be considered. Thus, by using the most suitable tube voltage and additional filter by analysis of X ray absorption, not as a single value but as an X ray spectrum, a greater effect can be expected.
公益社団法人日本放射線技術学会の論文
1987-09-01

著者

四宮恵次
化成オプトニクス

増感紙のX線エネルギー有効利用に関する研究

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