医用LCDモニタの色温度におけるカラースケールテストパターンの色度変化

摘要

In Japan, medical liquid-crystal display (LCD) and general LCD monitors have color temperatures of 7500 and 6500 K, respectively. The differences in color temperature make it difficult for radiologists to judge whether the same color is being displayed on the monitor. Therefore, the radiologist may overlook lesions. We examined chromaticity on a color scale test pattern to determine the relationships between color temperature (6500-12,500 K) of the medical color LCD monitors, there are three types of fluorescent light and three types of illuminance LCD monitors. As the color temperature of the monitor increased, the variation in chromaticity for grayscale test patterns increased and those variations for the blue scale test patterns decreased in a dark room and at 600 lux. In addition, even if the color temperature of the monitor was changed, the variation in chromaticity showed no change under fluorescent lighting with light bulb color and daylight color. The results of this study will be useful for quality control and quality assurance of medical LCD monitors in terms of illuminance and color temperature of the monitor.%Japanese Industries Association of Radiological Systems (JIRA)やAmerican Association of Physicists in Medicine Task Group 18 (AAPM TG 18)のガィドラィンを基に，モノク口の医用液晶ディスプレイ（liquid-crystal display: LCD)モニタは，grayscale standard display function (GSDF)における適切なコントラスト応答，最大輝度，輝度比などが定められている.また，LCDモニタの解像度や異なった読影環境における胸部単純X線画像上の結節状陰影，間質性肺炎疾患などの検出に関する観察実貌や乳房X線画像上の腫瘤状陰影，微小石灰化の検出に関する観察実験が報告されている.