Relacionar Columnas RADR 1313 Chapter 8 TermsVersión en línea Chapter 8 Terms por Courtney Akvan 1 fixed kVp/variable mAs technique chart 2 density controls 3 contrast medium 4 photomultiplier (PM) tube 5 extrapolated 6 backup time 7 automatic exposure control (AEC) 8 variable kVp/fixed mAs technique chart 9 detectors 10 minimum response time 11 ionization/ion chamber 12 optimal kVp 13 caliper 14 comparative anatomy 15 exposure technique charts 16 anatomically programmed techniques 17 phototimer 18 mAs readout A substance instilled into the body by injection or ingestion that is used when imaging anatomic tissues that have low subject contrast. Also called contrast agent. A type of exposure technique chart that is based on the concept of selecting an optimal kVp value that is required for the radiographic examination and adjusting the mAs for variations in part thickness. A radiographic system that allows the radiographer to select a particular button on the control panel that represents an anatomic area; a preprogrammed set of exposure factors is displayed and selected for use. The actual mAs used for the image is displayed immediately after the AEC exposure, sometimes for only a few seconds A system used to consistently control the amount of radiation reaching the image receptor by terminating the length of exposure. Concept stating that different parts of the same size can be radiographed using the same exposure factors, provided the minimum kVp value needed to penetrate the part is used in each case. An electronic device that converts visible light energy into electrical energy A device that measures part thickness. Pre-established guidelines used by the radiographer to select standardized manual or AEC exposure factors for each type of radiographic examination The sensors, cells, or chambers within an AEC device that sense how much radiation has reached the imaging plate in order to terminate the exposure. Refers to the shortest exposure time that the AEC system can produce. Controls that allow the radiographer to adjust the amount of preset radiation detection values. Each control changes the exposure time by a certain predetermined amount or increment. A type of exposure technique chart based on the concept that kVp can be increased as the anatomic part size increases. The baseline kVp is increased by 2 for every 1 cm increase in part thickness, and the mAs is maintained. The maximum length of time for which the x-ray exposure continues when using an AEC system. Uses a fluorescent (light-producing) screen and a device that converts light to electricity in an AEC device The kVp value that is high enough to ensure penetration of the part but not too high to diminish radiographic contrast. A hollow cell that contains air and is connected to the AEC timer circuit via an electrical wire. Mathematically estimated; the mathematical process used to create technique charts.
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