title: Intra- and interobserver agreement and performance score of breast phantom image interpretation: influence of ambient room lighting levels.
abstract: The influence of ambient room lighting conditions on soft-copy breast phantom image interpretation was evaluated by comparing cathode ray tube (CRT) monitors with liquid crystal displays (LCDs). Nine observers were asked to use a three-point scale to rate the visibility of various phantom objects (masses, specks, and fibers) displayed on a 21-inch CRT (2,560 x 2,048) and a 21-inch LCD (2,560 x 2,048) under three different levels of ambient lighting (20, 100 and 420 lux at the display center). Each phantom image was interpreted twice, and the reproducibility of judgment and inter-observer agreement was evaluated using kappa statistics. Except for the "mass" score, the LCD score showed a significantly higher value (p<0.05) compared with that of CRT. Nevertheless, no significant differences were found among the three lighting levels. Furthermore, intra- and inter-observer agreement in judgments showed no effects of room illumination. Although the breast phantom objects were better visualized on LCDs than on CRT monitors, room illumination did not affect the performance score of soft-copy reading.
authors.affiliation: Faculty of Radiological Technology, Fujita Health University School of Health Sciences, Aichi, Japan.
authors.forename: Kazuyuki
authors.initials: K
authors.lastname: Koyama
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Shimamoto
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Ikeda
authors.forename: Hideyuki
authors.initials: H
authors.lastname: Muramoto
authors.forename: Hiroko
authors.initials: H
authors.lastname: Satake
authors.forename: Akiko
authors.initials: A
authors.lastname: Sawaki
authors.forename: Katsuhiko
authors.initials: K
authors.lastname: Kato
authors.forename: Hiromichi
authors.initials: H
authors.lastname: Fukushima
authors.forename: Takeo
authors.initials: T
authors.lastname: Ishigaki
mesh_terms: D001943:Breast Neoplasms / Q000000981:diagnostic imaging*; D003201:Computers; D003626:Data Display; D005260:Female; D006801:Humans; D008029:Lighting; D050866:Liquid Crystals; D008327:Mammography / Q000379:methods* / Q000706:statistics & numerical data; D015588:Observer Variation; D019047:Phantoms, Imaging; D011856:Radiographic Image Enhancement / Q000379:methods*