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

DOI Web Site 被引用文献1件 オープンアクセス

書誌事項

タイトル別名
  • RELATIONSHIP BETWEEN DETECTABILITY BY THE 18-AFC METHOD AND SPECTRAL SN RATIO

この論文をさがす

説明

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.

収録刊行物

被引用文献 (1)*注記

もっと見る

詳細情報 詳細情報について

問題の指摘

ページトップへ