title: A computerized method for automated identification of erect posteroanterior and supine anteroposterior chest radiographs.
abstract: A computerized scheme was developed for automated identification of erect posteroanterior (PA) and supine anteroposterior (AP) chest radiographs. The method was based on three features, the tilt angle of the scapula superior border, the tilt angle of the clavicle and the extent of radiolucence in lung fields, to identify the view of a chest radiograph. The three indices A(scapula), A(clavicle) and C(lung) were determined from a chest image for the three features. Linear discriminant analysis was used to classify PA and AP chest images based on the three indices. The performance of the method was evaluated by receiver operating characteristic analysis. The proposed method was evaluated using a database of 600 PA and 600 AP chest radiographs. The discriminant performances Az of A(scapula), A(clavicle) and C(lung) were 0.878 ± 0.010, 0.683 ± 0.015 and 0.962 ± 0.006, respectively. The combination of the three indices obtained an Az value of 0.979 ± 0.004. The results indicate that the combination of the three indices could yield high discriminant performance. The proposed method could provide radiologists with information about the view of chest radiographs for interpretation or could be used as a preprocessing step for analyzing chest images.
authors.affiliation: Department of Medical Imaging and Radiological Sciences, Kaohsiung Medical University, Kaohsiung, Taiwan. tonykao@kmu.edu.tw
authors.forename: E-Fong
authors.initials: EF
authors.lastname: Kao
authors.forename: Wei-Chen
authors.initials: WC
authors.lastname: Lin
authors.forename: Jui-Sheng
authors.initials: JS
authors.lastname: Hsu
authors.forename: Ming-Chung
authors.initials: MC
authors.lastname: Chou
authors.forename: Twei-Shiun
authors.initials: TS
authors.lastname: Jaw
authors.forename: Gin-Chung
authors.initials: GC
authors.lastname: Liu
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001331:Automation; D016002:Discriminant Analysis; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008168:Lung / Q000000981:diagnostic imaging; D008297:Male; D008875:Middle Aged; D013902:Radiography, Thoracic / Q000379:methods*; D016683:Supine Position; D055815:Young Adult