title: Linearity of exposure with indicated time and current for diagnostic radiography units.
abstract: Quality control in diagnostic radiography begins with production of predictable exposures. The authors describe a technique which permits determination of the variation of mR/mAs for the entire diagnostic range of times and currents in only about 1 hour. The mR/mAs in newly installed units has been shown to vary by as much as +/- 50% compared to institutional acceptance levels of +/- 10%. Records of annual surveys and acceptance tests from 31 medical facilities, including 293 radiographic and fluoroscopic units, are reviewed, and effects of small variations in mAs on radiographic quality are shown.
mesh_terms: D006801:Humans; D011786:Quality Control; D011829:Radiation Dosage; D011859:Radiography / Q000295:instrumentation / Q000379:methods; D013997:Time Factors