TY - JOUR
T1 - Effect of ambient light variations on luminance ratio of CRT monitor and image contrast in ultrasonography
AU - Hatanaka, Shiro
AU - Morishita, Junji
AU - Chishaki, Akiko
AU - Noguchi, Yukari
AU - Hokazono, Eisaku
AU - Komiya, Yoko
AU - Higashida, Yoshiharu
AU - Shimanoe, Yoshinobu
AU - Nakamura, Kunio
AU - Tashiro, Hiroyuki
N1 - Copyright:
This record is sourced from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
PY - 2009/11/20
Y1 - 2009/11/20
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=77449091884&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77449091884&partnerID=8YFLogxK
U2 - 10.6009/jjrt.65.1512
DO - 10.6009/jjrt.65.1512
M3 - Article
C2 - 20019431
AN - SCOPUS:77449091884
SN - 0369-4305
VL - 65
SP - 1512
EP - 1518
JO - Nippon Hoshasen Gijutsu Gakkai zasshi
JF - Nippon Hoshasen Gijutsu Gakkai zasshi
IS - 11
ER -