title: Comparison of image layer location among panoramic machines of the same manufacturer.
abstract: The central plane of the image layer was located in several panoramic machines of the same manufacturer by making radiographs of a spherical test object placed in different positions. A round image indicated that the test object was at the central plane. The inconsistency of the location of the central plane in machines tested indicates the need for establishing a quality assurance test to verify image-layer location before patient exposure.
authors.affiliation: Department of Dental Diagnostic Sciences, Indiana University School of Dentistry, Indianapolis.
authors.forename: T F
authors.initials: TF
authors.lastname: Razmus
authors.forename: B J
authors.initials: BJ
authors.lastname: Glass
authors.forename: W D
authors.initials: WD
authors.lastname: McDavid
mesh_terms: D002138:Calibration; D011786:Quality Control; D011862:Radiography, Panoramic / Q000295:instrumentation* / Q000592:standards