title: A preliminary study for exploring the luminance ratio of liquid-crystal displays required for display of radiographs.
abstract: Medical-grade liquid-crystal displays (LCDs) with high contrast ratio (CR) values have recently been developed and become available for soft-copy reading. When the LCD is used under ambient light conditions, the luminance ratio (LR) is a more appropriate indicator than the CR. Our aim was to explore the LR required for LCDs for soft-copy reading by comparing the effective LR values with the LR of the LCD. We defined "the luminance ratio in an image (LRimg)", the ratio of the maximum to minimum luminance in a radiograph displayed on the LCD, as the effective LR values required for the LCD. The maximum LRimg values in chest radiographs and those in mammograms ranged from 109 to 143 and 372 to 431, respectively. The LR of the LCD was higher than the LRimg values of the radiographs. Our results indicate that currently available medical-grade LCDs have enough LR for display of radiographs.
authors.affiliation: Department of Health Sciences, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, 812-8582, Japan, shinya.takarabe@gmail.com.
authors.forename: Shinya
authors.initials: S
authors.lastname: Takarabe
authors.forename: Junji
authors.initials: J
authors.lastname: Morishita
authors.forename: Hidetake
authors.initials: H
authors.lastname: Yabuuchi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Akamine
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Hashimoto
authors.forename: Yasuhiko
authors.initials: Y
authors.lastname: Nakamura
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Matsuo
authors.forename: Akiko
authors.initials: A
authors.lastname: Hattori
mesh_terms: D001940:Breast / Q000473:pathology; D002138:Calibration; D003626:Data Display; D005260:Female; D006801:Humans; D008027:Light; D008029:Lighting; D050866:Liquid Crystals; D008297:Male; D008327:Mammography / Q000295:instrumentation*; D015588:Observer Variation; D011856:Radiographic Image Enhancement / Q000379:methods; D013902:Radiography, Thoracic / Q000295:instrumentation*; D015203:Reproducibility of Results