胸部用スクリーンフィルムシステムの評価

概要

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Regarding chest radiograph imaging, the density is distributed only in the two extremities, the high-density area mainly of the lungs and the low-density area mainly of mediastina. This is the feature of the image quality of chest radiographs which requires special attention in evaluating images. For each density area, we devised and examined the methods of selecting the film-screen system best suited to chest radiography. The experiments were carried out respectively with the sharpness in the high density area, the visual detectability of low-contrast signals in low density area and the condition of granularity when a photographic subject is used (Figs. 3 and 6). As a result of our experiments, radiographic image is affected by the film's own sharpness while the thickness of the subject is small. With the increase in the thickness, however, it is affected by the toe's form of the H&D curve. In this study, it was recognized that simulation experiments based on the examination of the subject in question is essential prior to the immediate advance from physical data to clinical radiographs.
公益社団法人日本放射線技術学会の論文
1988-10-01