18 肢強制選択法の検出率とスペクトル SN 比との相関について

概要

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We examined the relationship between SN ratio of visual threshold value and radiographic image by using various sizes of plastic columns and various speeds of screen/film systems to change the signal value. We tried to get a visual estimation applyjng the 18-AFC (18-alternative forced choice) method using five radiological technologists. On the other side, we got a physical estimation applying the spectral SN ratio composed of NEQ (u) (Number of noise-equivalent quanta (u)) and distributed spectral of the signal. As a result, when we assumed the threshold value of detectability of the 18-AFC method was 50%, we found that SN ratio of the visual threshold value was 3.23. When the speed of the screen/film system increases, the threshold value of the SN ratio decreases. We were able to confirm that the visual characteristics depend on the contrast and spatial frequency of the signal.
社団法人日本放射線技術学会の論文
1993-05-01