4.ゲシュタルト心理学を応用した種々のフィルムスクリーンシステム写真の画像評価(I.高感度増感紙システムにおける問題点)(第7回放射線技術)

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A recognition of a pattern on a radiograph through a visual system was analyzed by introducing the theory of the Gestalt psychology. In this analysis, it was assumed that any pattern on a radiograph can be recognized from view-points of a homogeneity and/or a closed characteristic on the pattern. From this assumption, it was proposed four standard pattern models, into which patterns on any radiograph can be classified entirely. Moreover, the pattern was visually recognized by a total and integrated recognition of a pattern and/or a circumference recognition (a recognition of a line and point, outline of a pattern). A numerical evaluation of the image recognition of a radiograph was performed for the recognition of pattern by using a visual discriminating power on different patterns of Hawlet chart on a radiograph. Since an image quality of the radiograph depends upon factors of physical transmition system, radiographic technique and radiographic part of patient and so on, and affects strongly the image recognition of the radiograph, the image quality of the radiograph was estimated for various conditions of screen-film combinations and tube voltage. The image quality of the radiograph was improved in proportion to logarithm of the exposure in any condition of the screen-film combinations and the tube voltage. Therefore, a high image quality of a radiograph may not be obtained at a low exposure. A combination of a high speed screen and a low speed film better image quality do the radiograph than that of a low speed screen and a high speed film under the same condition of radiographic blacking density and the exposure. Especially a monocolor film, Medichrome, a good image quality on the radiograph in a combination with a high speed screen. Introduction of Gestalt psychology to the radiographic image recognition showed that a screen-film combination having worse homogeneity on the pattern (worse granularity) gave us inferior image quality to that having better homogeneity. Therefore, one important matter to improve the image quality of the radiograph is to improve the granularity on the film for the high speed radiographic system.
公益社団法人日本放射線技術学会の論文
1980-05-01

4.ゲシュタルト心理学を応用した種々のフィルムスクリーンシステム写真の画像評価(I.高感度増感紙システムにおける問題点)(第7回放射線技術)

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