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