Matching Pairs RADR 1313 Chapter 8 TermsOnline version Chapter 8 Terms by Courtney Akvan 1 contrast medium 2 comparative anatomy 3 photomultiplier (PM) tube 4 backup time 5 exposure technique charts 6 density controls 7 automatic exposure control (AEC) 8 variable kVp/fixed mAs technique chart 9 anatomically programmed techniques 10 phototimer 11 caliper 12 minimum response time 13 mAs readout 14 extrapolated 15 fixed kVp/variable mAs technique chart 16 detectors 17 optimal kVp 18 ionization/ion chamber 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. The maximum length of time for which the x-ray exposure continues when using an AEC system. A hollow cell that contains air and is connected to the AEC timer circuit via an electrical wire. 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. The kVp value that is high enough to ensure penetration of the part but not too high to diminish radiographic contrast. 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. 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. 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. A device that measures part thickness. Mathematically estimated; the mathematical process used to create technique charts. Pre-established guidelines used by the radiographer to select standardized manual or AEC exposure factors for each type of radiographic examination 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. Uses a fluorescent (light-producing) screen and a device that converts light to electricity in an AEC device 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. An electronic device that converts visible light energy into electrical energy
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