title: [Digital radiography: optimization of chest radiographs using a modified exposure control].
abstract: Phototiming over the lung fields frequently compromises the signal-to-noise ratio available in the mediastinal and diaphragmatic regions of the chest. A moderate dose increase would be justified if a significant improvement in diagnostic performance could be achieved. We compared the impact of mediastinal phototiming (150 kVp, 150 cm FFD, 1.0 mm focus, 12:1 grid [higher kVp chosen to minimize dose increase]) to standard lungfield phototiming (125 kVp, 150 cm FFD, 1.0 mm focus, 12:1 grid) on the detectability of simulated pulmonary nodules (wax, 0.5-2.5 cm in diameter) superimposed on human volunteers in storage phosphor radiographs (1744 x 2144 pixels, 10 bit). ROC analysis of 1920 observations by 8 readers showed a significantly higher (p less than 0.03) detectability of simulated pulmonary nodules with mediastinal phototiming (ROC area = 0.89) than standard lungfield phototiming (ROC area = 0.84).
authors.affiliation: Abt. Diagnostische Radiologie I, Medizinische Hochschule Hannover.
authors.forename: S
authors.initials: S
authors.lastname: Reichelt
authors.forename: J W
authors.initials: JW
authors.lastname: Oestmann
authors.forename: M
authors.initials: M
authors.lastname: Prokop
authors.forename: G
authors.initials: G
authors.lastname: Hagemann
authors.forename: W
authors.initials: W
authors.lastname: Knüpfer
authors.forename: M
authors.initials: M
authors.lastname: Galanski
mesh_terms: D006801:Humans; D008961:Models, Structural; D012372:ROC Curve; D011856:Radiographic Image Enhancement / Q000295:instrumentation / Q000379:methods*; D013902:Radiography, Thoracic / Q000295:instrumentation / Q000379:methods*; D003074:Solitary Pulmonary Nodule / Q000000981:diagnostic imaging*
vernacular_title: Digitale Radiographie: Optimierung der Thoraxaufnahmetechnik durch modifizierte Belichtungssteuerung.