title: Storage phosphor radiography of wrist fractures: a subjective comparison of image quality at varying exposure levels.
abstract: Image quality of storage phosphor radiographs acquired at different exposure levels was compared to define the minimal radiation dose needed to achieve images which allow for reliable detection of wrist fractures. In a study on 33 fractured anatomical wrist specimens image quality of storage phosphor radiographs was assessed on a diagnostic PACS workstation by three observers. Images were acquired at exposure levels corresponding to a speed classes 100, 200, 400 and 800. Cortical bone surface, trabecular bone, soft tissues and fracture delineation were judged on a subjective basis. Image quality was rated according to a standard protocol and statistical evaluation was performed based on an analysis of variance (ANOVA). Images at a dose reduction of 37% were rated sufficient quality without loss in diagnostic accuracy. Sufficient trabecular and cortical bone presentation was still achieved at a dose reduction of 62%. The latter images, however, were considered unacceptable for fracture detection. To achieve high-quality storage phosphor radiographs, which allow for a reliable evaluation of wrist fractures, a minimum exposure dose equivalent to a speed class of 200 is needed. For general-purpose skeletal radiography, however, a dose reduction of up to 62% can be achieved. A choice of exposure settings according to the clinical situation (ALARA principle) is recommended to achieve possible dose reductions.
authors.affiliation: Department of Radiology, University Hospital, Anichstrasse 35, 6020 Innsbruck, Austria. regina.peer@uibk.ac.at
authors.forename: Regina
authors.initials: R
authors.lastname: Peer
authors.forename: Anton
authors.initials: A
authors.lastname: Lanser
authors.forename: Salvatore M
authors.initials: SM
authors.lastname: Giacomuzzi
authors.forename: Sigurd
authors.initials: S
authors.lastname: Pechlaner
authors.forename: Heinz
authors.initials: H
authors.lastname: Künzel
authors.forename: Gerd
authors.initials: G
authors.lastname: Bodner
authors.forename: O
authors.initials: O
authors.lastname: Gaber
authors.forename: Werner
authors.initials: W
authors.lastname: Jaschke
authors.forename: Siegfried
authors.initials: S
authors.lastname: Peer
mesh_terms: D050723:Fractures, Bone / Q000000981:diagnostic imaging*; D006801:Humans; D015588:Observer Variation; D011856:Radiographic Image Enhancement / Q000379:methods; D014954:Wrist Injuries / Q000000981:diagnostic imaging*