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Radiology Unit 4
S&T's
| Question | Answer |
|---|---|
| Underdeveloping | Results in light, difficult to view films-caused from insufficient processing with weak chemicals, time or temperature. |
| Overdeveloping | results in radiographs that are too dark and difficult to interpret |
| Foreshortening | Tooth structures appear shorter than their actual anatomical size-caused by excessive vertical angulation |
| Elongation | the image of tooth structure appears longer tan actual size due to insufficient vertical angulation |
| Overlapping | distortion of the film showing an overlapping of the crowns superimposed on adjacent teeth-caused by improper horizontal angulation |
| Cone cutting | improper placement of the central beam which is caused by lack of exposure to radiation. PID is not centered properly |
| Reticulation | crackling of film emulsion caused by large temperature differences between processing solutions. gives a stained glass effect. |
| Fog | clouded, darkened, or blemished x-ray film results- caused by old film, contaminated solutions, faulty safelight, improper storage of film |
| Herringbone effect | fish bone effect on film surgace resulting from placing film in the mouth backwards |
| Landmarks | anatomic structures that act as guides |
| Contrast | Variations in shades from black to white |
| Density | film blackening occurring from the percentage of light transmitted through a film |
| Radiolucent | portion of radiograph that appears dark or ability of a substance to permit passage of x-ray causing darkening on film |
| Radiopaque | portion of radiograph that appears light or the ability of a substance to resist x-ray penetration causing light area on the film |
| Definition | outline sharpness and clarity of image exhibited on radiograph |
| Double exposure | two exposures on one film |
| Panoramic radiograph | extraoral radiograph showing the entire mandible, maxilla, teeth and other structures |
| Extraoral radiographs | radiographs taken outside of the mouth |
| Cephalometric radiograph | extraoral radiograph taken from a lateral or frontal view showing the relationship between the jaws and other skeletal structures |
| Occlusal radiograph | intraoral radiograph showing the entire maxillary or mandibular arch surrounding structures |
Created by:
mthompson
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