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Anatomically programmed radiography (APR)
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Automatic exposure control (AEC)
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Ch. 13 &15
| Question | Answer |
|---|---|
| Anatomically programmed radiography (APR) | 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 & selected for us |
| Automatic exposure control (AEC) | a device that uses an ionization chamber to detect the quantity of radition exposing the patient & IR |
| Backup time | the maximum length of time the x-ray exposure will continue when using an automatic exposure control system |
| Bone densitometry | a specialized procedure during ionization radiation to provide info on the condition of the skeletal bones |
| Dedicated units | radiographic units designed for specific imaging procedures |
| Density controls | part of the automatic exposure control device that allows the radiographer to adjust the amount of present radiation detection values |
| Detectors | radiation-measuring devices |
| Focal plane | or object plane. the plane where the area of interest lies, at the level of the fulcrum |
| Fulcrum | or pivot point. the fixed point during the movement of the x-ray tube, which lies within the plane of the anatomic area to be imaged |
| Ionization or ion chamber | a hollow cell that contains air & is connected to the timer circuit via an electrical wire |
| Linear tomographic | an imaging procedure using movement of the x-ray tube & IR in opposing directions to create images of structures in a focal plane by blurring the anatomy located above & below the plane of interest |
| Mammography | specialized radiographic imaging procedure of the breast |
| mAs readout | the actual amount of mAs used for an image is displayed on an automatic exposure control panel immediately after the exposure |
| Minimum response time | - the shortest exposure time that the automatic exposure control (AEC) system can produce |
| Osteoporosis | a bone disease in which the bones become thinner & more porous & therefore susceptible to fx’s |
| Panoramic x-ray (panorex) | unit that is designed to image curved surfaces, typically the mandible & teeth |
| Photodiode | a solid-state device that performs the same function as a photomultiplier tube |
| Photomultiplier (PM) tube | an electronic device that converts visible light energy into electrical energy |
| Phototimer | automatic exposure control detectors that use a fluorescent (light-producing) screen & a device that converts the light to electricity |
| Tomographic angle | the angle or arc created during total movement of the x-ray tube; directly related to the amount of blur created in the image |
Created by:
hicksm0155
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