title: An ROC study of chest radiographs: 2K Versus 4K high-resolution soft-copy images.
abstract: Computed radiography of chest with a 4K image array was recently introduced. We performed a multiobserver study to compare the diagnostic accuracy of 2K (standard) and 4K (high quality) chest radiographs displayed on a 5-mega-pixel monitor (2K monitor). One hundred cases of posteroanterior chest radiographs (a total of 200 images) were selected by two chest radiologists. Those radiographs included pneumothorax (n = 14), nodules (n = 15), interstitial disease (n = 10), or neither abnormality (n = 61). These were interpreted by four radiologists in two separate sessions. They recorded their confidence scale for the presence or absence of abnormality. Diagnostic accuracy was determined by receiver operating characteristic (ROC) analysis for each observer. ROC analysis showed no statistically significant difference between the 2K and 4K modes for the detection of any of the different abnormalities by individual readers. Our preliminary study suggests that 2K mode would be sufficient for the detection of abnormality on chest radiograph and there is no considerable validity to incline toward the 4K mode in current picture archiving and communication system environment using 2K monitor. However, we think that additional investigation using more subtle parenchymal or rib lesion should be followed.
authors.affiliation: Department of Radiology, Ilsan Paik Hospital, Inje University School of Medicine, 2240, DaeHwa-Dong, Ilsan-GU, GoYang-Si, KyungGi-Do, 411-706, South Korea. swimminkim@hanmail.net
authors.forename: Su Young
authors.initials: SY
authors.lastname: Kim
authors.forename: Yoon Joon
authors.initials: YJ
authors.lastname: Hwang
authors.forename: Yoon Hee
authors.initials: YH
authors.lastname: Han
authors.forename: Jung Wook
authors.initials: JW
authors.lastname: Seo
authors.forename: Ji Young
authors.initials: JY
authors.lastname: Lee
authors.forename: Yong Hoon
authors.initials: YH
authors.lastname: Kim
authors.forename: Soon Joo
authors.initials: SJ
authors.lastname: Cha
authors.forename: Gham
authors.initials: G
authors.lastname: Hur
authors.forename: Sung Soon
authors.initials: SS
authors.lastname: Lee
mesh_terms: D006801:Humans; D017563:Lung Diseases, Interstitial / Q000000981:diagnostic imaging; D015588:Observer Variation; D011030:Pneumothorax / Q000000981:diagnostic imaging; D012372:ROC Curve; D011856:Radiographic Image Enhancement; D013902:Radiography, Thoracic / Q000379:methods*; D003074:Solitary Pulmonary Nodule / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed