title: Detector response and exposure control of the RadioVisioGraphy system (RVG 32000 ZHR).
abstract: The RadioVisioGraphy system (RVG 32000 ZHR) was studied with respect to some physical properties including the precision and linearity of the exposure control and the detector response to x-rays. The x-ray unit was found to yield repetitive exposures that are precisely controlled by the CCX timer. A "preheat" and an "after exposure" period were noticed, and their resulting x-ray exposures were measured. Two RVG detectors were compared for their responses with x-rays. The differences between the detectors were insignificant. However, inhomogeneous detector responses were found in both of the detectors; with the same exposure, the central parts of the detectors yielded lower pixel values than the peripheral parts. A calibration equation was developed to correct for the inhomogeneity.
authors.affiliation: Department of Oral Medicine, School of Dentistry, University of Washington, Seattle.
authors.forename: S K
authors.initials: SK
authors.lastname: Chen
authors.forename: L
authors.initials: L
authors.lastname: Hollender
mesh_terms: D011829:Radiation Dosage; D011834:Radiation Monitoring / Q000295:instrumentation*; D011861:Radiography, Dental / Q000295:instrumentation*; D015203:Reproducibility of Results; D012666:Semiconductors; D013997:Time Factors