title: [Effect of ambient light variations on luminance ratio of CRT monitor and image contrast in ultrasonography].
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.
authors.affiliation: Department of Health Sciences, Graduate School of Medical Sciences, Kyushu University.
authors.forename: Shiro
authors.initials: S
authors.lastname: Hatanaka
authors.forename: Junji
authors.initials: J
authors.lastname: Morishita
authors.forename: Akiko
authors.initials: A
authors.lastname: Chishaki
authors.forename: Yukari
authors.initials: Y
authors.lastname: Noguchi
authors.forename: Eisaku
authors.initials: E
authors.lastname: Hokazono
authors.forename: Yoko
authors.initials: Y
authors.lastname: Komiya
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Higashida
authors.forename: Yoshinobu
authors.initials: Y
authors.lastname: Shimanoe
authors.forename: Kunio
authors.initials: K
authors.lastname: Nakamura
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Tashiro
mesh_terms: D055984:Cathode Ray Tube; D008029:Lighting; D014463:Ultrasonography / Q000295:instrumentation