Effects of ambient-light correction in luminance measurements of liquid-crystal display monitors by use of a telescopic-type luminance meter.
The quality control of liquid-crystal display (LCD) monitors has become one of the important topics for maintaining reliable soft-copy readings in the interpretation of diagnostic images. In this paper, the effects of correction in the luminance measurement of an LCD monitor by use of a telescopic-type luminance meter were investigated. The luminance of the LCD monitor in different ambient-lighting conditions was measured and compared to the results obtained with no ambient lighting (0 lux). The reproducibility of luminance measurements and luminance ratios without a baffled tube was lower than those measured with the baffled tube due to the effect of ambient light. These tendencies were obvious at a relatively low luminance. The correction method by subtraction of the reflected ambient light on the surface of the LCD monitor and the stray light of the telescopic-type luminance meter from the measured luminance was examined. We found that the correction was able to bring the luminance close to that measured with the baffled tube.
Shiiba
Takuro
T
Department of Radiological Technology, Koga General Hospital, Ikeuchi-cho, Miyazaki, Japan. tshiiba@kgh.or.jp
Tanoue
Naofumi
N
Tateoka
Shinji
S
Maeda
Masaji
M
Toyofuku
Fukai
F
Morishita
Junji
J
D016477:Artifacts; D003626:Data Display; D007090:Image Interpretation, Computer-Assisted; D008027:Light; D050866:Liquid Crystals; D015203:Reproducibility of Results; D012542:Scattering, Radiation
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