A study of the deterioration of X-ray fluoroscopic screens Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/np193c63f

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  • Fluoroscopic screens
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  • From the time when fluoroscopic screens were first used there have been scattered references to reduction in their light output due to age, use, etc. References are scarce and usually devoid of quantitative data. A long-range program has been set up in an effort to arrive at some meaningful information. A group of 24 fluoroscopic screens were used in this study, 12 each from two manufacturers. All screens were of the zinc-cadmium sulfide phosphor type mounted on plastic backing material. The screens were divided into test groups and subjected to exposure of X-ray, sunlight, incandescent lamps and fluorescent lamps. Test conditions were so designed that they could be related to some realistic exposure to which the screen in a diagnostic unit might be subjected. To determine their relative condition, measurements of the light output of all the screens were taken on a monthly basis. These measurements were made under controlled conditions utilizing a specially-constructed special X-ray unit and a direct-light meter employing a photomultiplier tube as the detector. By use of a direct-reading instrument calibrated in foot-lamberts, measurements were made independently of the sensitivity of the observer's eye and required no time-consuming matching of brightness. Calibration of the light meter was maintained by use of a regulated brightness source. Where possible, old fluoroscopic screens were tested to compare their light output efficiency with that of a new screen.
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