書誌事項
- タイトル別名
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- RELATIONSHIP BETWEEN DETECTABILITY BY THE 18-AFC METHOD AND SPECTRAL SN RATIO
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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
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- 日本放射線技術学会雑誌
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日本放射線技術学会雑誌 49 (5), 682-690, 1993
公益社団法人 日本放射線技術学会
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詳細情報 詳細情報について
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- CRID
- 1390282681356082304
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- NII論文ID
- 110003471105
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- ISSN
- 18814883
- 03694305
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
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- CiNii Articles
- OpenAIRE
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- 抄録ライセンスフラグ
- 使用不可