Effect of Ambient Light Variations on Luminance Ratio of CRT Monitor and Image Contrast in Ultrasonography
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- Hatanaka Shiro
- Department of Health Sciences, Graduate School of Medical Sciences, Kyushu University
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- Morishita Junji
- Department of Health Sciences, Faculty of Medical Sciences, Kyushu University
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- Chishaki Akiko
- Department of Health Sciences, Faculty of Medical Sciences, Kyushu University
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- Noguchi Yukari
- Department of Health Sciences, Faculty of Medical Sciences, Kyushu University
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- Hokazono Eisaku
- Department of Health Sciences, Faculty of Medical Sciences, Kyushu University
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- Komiya Yoko
- Department of Medical Technology, Kyushu University Hospital
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- Higashida Yoshiharu
- Department of Health Sciences, Faculty of Medical Sciences, Kyushu University
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- Shimanoe Yoshinobu
- Co-medical Corporation
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- Nakamura Kunio
- Yamagiwa Corporation
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- Tashiro Hiroyuki
- Department of Health Sciences, Faculty of Medical Sciences, Kyushu University
Bibliographic Information
- Other Title
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- 環境照度の違いがCRTモニタの輝度比と超音波画像のコントラストに与える影響
- 臨床技術 環境照度の違いがCRTモニタの輝度比と超音波画像のコントラストに与える影響
- リンショウ ギジュツ カンキョウ ショウド ノ チガイ ガ CRT モニタ ノ キドヒ ト チョウオンパ ガゾウ ノ コントラスト ニ アタエル エイキョウ
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Abstract
Variation in the luminance ratio of a cathode ray tube(CRT)monitor and the ultrasonographic images at different levels of ambient light(0–150 lux)was investigated to obtain optimum ambient light in the ultrasonography suite. The maximum and minimum luminances of test patterns and ultrasonographic images were measured after three technicians independently optimized the brightness and contrast of the CRT monitor and ultrasonographic images at different levels of ambient light. Furthermore, the luminance ratio was calculated from the maximum luminance divided by the minimum luminance. When ambient light increased, it was difficult for the technicians to optimize the brightness and contrast settings of the CRT monitor to maintain a high luminance ratio at 0 lux. The luminance ratio decreased rapidly as ambient light increased up to 20 lux. However, the luminance ratio decreased gradually when ambient light was higher than 20 lux. It is necessary to take into consideration the ambient light to maintain a high luminance ratio of ultrasonographic images.
Journal
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- Japanese Journal of Radiological Technology
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Japanese Journal of Radiological Technology 65 (11), 1512-1518, 2009
Japanese Society of Radiological Technology
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Details 詳細情報について
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- CRID
- 1390282681339136512
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- NII Article ID
- 10025977794
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- NII Book ID
- AN00197784
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- ISSN
- 18814883
- 03694305
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- NDL BIB ID
- 10507094
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed