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Radiology Unit 4

S&T's

QuestionAnswer
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 on 2010-02-25



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