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Chapter 13
Chapter 13: Exposure Technique Selection Key Terms
| Question | Answer |
|---|---|
| A radiographic system that allows the radiographer to select a particular button on the control panel that represents an anatomic area. A pre-programmed set of exposure factors is displayed and selected for use: | anatomically programmed technique |
| A device that uses an ionization chamber to detect the quantity of radiation exposing the patient and IR | automatic exposure control (AEC) |
| The maximum length of time the x-ray exposure will continue when using an automatic exposure control system | backup time |
| Devices that measure part thickness | calipers |
| Similar anatomic parts can use similar exposure techniques to achieve diagnostic radiographs | comparative anatomy |
| A substance that can be instilled into the body by injection or ingestion | contrast medium |
| Part of the automatic exposure control device that allows the radiographer to adjust the amount of preset radiation detection values, also known as exposure adjustment | density controls |
| Radiation-measuring devices | detectors |
| Part of the automatic exposure control device that allows the radiographer to adjust the amount of preset radiation detection values, also known as density controls | exposure adjustment |
| Preestablished guidelines used by the radiographer to select standardized manual or automatic exposure control factors for each type of radiographic examination | exposure technique chart |
| A type of technique exposure chart in which the optimal kVp value for each part is indicated and the mAs value is varied as a function of part thickness | fixed-kVp-variable mAs technique chart |
| A hollow cell that contains air and is connected to the timer circuit via an electrical wire | ionization/ion chamber |
| The actual amount of mAs used for an image is displayed immediately on an automatic exposure control panel immediately after exposure | mAs readout |
| The shortest exposure time that the automatic exposure control system can produce | minimum response time |
| The kVp value that is high enough to ensure penetration of the part but not too high to diminish subject contrast | optimal kVp |
| An electronic device that converts visible light energy into electrical energy | photomultiplier tube (PMT) |
| Automatic exposure control detectors that use a fluorescent (light-producing) screen and a device that converts the light to electricity | phototimer |
| A type of exposure technique chart that changes the kVp for change in part thickness | variable-kVp-fixed mAs technique chart |
Created by:
setelinea