title: Liquid-crystal display monitors and cathode-ray tube monitors: a comparison of observer performance in the detection of small solitary pulmonary nodules.
abstract: OBJECTIVE
  To compare observer performance using liquid-crystal display (LCD) and cathode-ray tube (CRT) monitors in the interpretation of soft-copy chest radiographs for the detection of small solitary pulmonary nodules.
  
  
  METHODS
  By reviewing our Medical Center's radiologic information system, the eight radiologists participating in this study (three board-certified and five resident) retrospectively collected 40 chest radiographs showing a solitary noncalcified pulmonary nodule approximately 1 cm in diameter, and 40 normal chest radiographs. All were obtained using a storage-phosphor system, and CT scans of the same patients served as the gold standard for the presence of a pulmonary nodule. Digital images were displayed on both high-resolution LCD and CRT monitors. The readers were requested to rank each image using a fivepoint scale (1 = definitely negative, 3 = equivocal or indeterminate, 5 = definitely positive), and the data were interpreted using receiver operating characteristic (ROC) analysis.
  
  
  RESULTS
  The mean area under the ROC curve was 0.8901+/- 0.0259 for the LCD session, and 0.8716+/- 0.0266 for the CRT session (p > 0.05). The reading time for the LCD session was not significantly different from that for the CRT session (37.12 and 41.46 minutes, respectively; p = 0.889).
  
  
  CONCLUSIONS
  For detecting small solitary pulmonary nodules, an LCD monitor and a CRT monitor are comparable.
authors.affiliation: Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea. seojb@amc.seoul.kr
authors.forename: Soon-A
authors.initials: SA
authors.lastname: Hwang
authors.forename: Joon Beom
authors.initials: JB
authors.lastname: Seo
authors.forename: Byeong-Kyoo
authors.initials: BK
authors.lastname: Choi
authors.forename: Kyung-Hyun
authors.initials: KH
authors.lastname: Do
authors.forename: Sung Min
authors.initials: SM
authors.lastname: Ko
authors.forename: Soo-Hyun
authors.initials: SH
authors.lastname: Lee
authors.forename: Jin-Seong
authors.initials: JS
authors.lastname: Lee
authors.forename: Jae-Woo
authors.initials: JW
authors.lastname: Song
authors.forename: Koun-Sik
authors.initials: KS
authors.lastname: Song
authors.forename: Tae-Hwan
authors.initials: TH
authors.lastname: Lim
mesh_terms: D003626:Data Display; D006801:Humans; D015588:Observer Variation; D012372:ROC Curve; D011856:Radiographic Image Enhancement; D003074:Solitary Pulmonary Nodule / Q000000981:diagnostic imaging*