title: [Chest radiography: ROC phantom study of four different digital systems and one conventional radiographic system].
abstract: OBJECTIVE
  To compare the diagnostic quality of five different radiographic systems used in chest radiography for visualization of differently configured, clinically relevant pathologic pulmonary structures.
  
  
  METHODS
  Four digital detector systems using as detection unit a CsI/aSi-based flat panel detector, a transparent imaging plate, a selenium detector and a conventional storage phosphor plate were analyzed for this study, as well as an asymmetrical film-screen system. The analyzed imaging material consisted of radiographs of an anthropomorphic chest-phantom with superimposed simulated pulmonary structures. The images were evaluated for different pathologic structures by a newly developed multiple structure ROC (ms-ROC).
  
  
  RESULTS
  The performance of each system was found to have a strong structure-related variability. The flat panel detector system had the best overall performance. The theoretical advantage of the 4k-matrix of the transparent imaging plate over the 3k-matrix of the flat panel detector was only confirmed for reticular structures.
  
  
  CONCLUSIONS
  In addition to comparing the image quality of the different systems, this study shows that the performance of a radiographic system depends on the structure to be analyzed. The modified ROC (ms-ROC) provides valid results with less effort.
authors.affiliation: Klinik für Diagnostische Radiologie, Otto-von-Guericke-Universität Magdeburg,Germany. ulf.redlich@medizin-uni-magdeburg.de
authors.forename: U
authors.initials: U
authors.lastname: Redlich
authors.forename: S
authors.initials: S
authors.lastname: Reissberg
authors.forename: C
authors.initials: C
authors.lastname: Hoeschen
authors.forename: O
authors.initials: O
authors.lastname: Effenberger
authors.forename: A
authors.initials: A
authors.lastname: Fessel
authors.forename: H
authors.initials: H
authors.lastname: Preuss
authors.forename: C
authors.initials: C
authors.lastname: Scherlach
authors.forename: W
authors.initials: W
authors.lastname: Döhring
mesh_terms: D006801:Humans; D015588:Observer Variation; D019047:Phantoms, Imaging; D012372:ROC Curve; D011856:Radiographic Image Enhancement / Q000295:instrumentation; D013902:Radiography, Thoracic / Q000379:methods; D014963:X-Ray Intensifying Screens