The portion of a processed radiograph that appears dark or black is termed
radiolucent
The portion of a processed radiograph that appears light or white is termed
radiopaque
Which of the following appears most radiolucent on a dental radiograph?
Air space
An example of a radiopaque structure seen on dental x-rays is
Bone, enamel, dentin
The overall blackness or darkness of a dental radiograph is termed
Density
Increasing the milliaperage (mA) will cause
An increase in density, the film appears darker
Increasing the operating kilovoltage peak (kVp) will cause
an increase in density, the film appears darker.
Increasing exposure time will cause
an increase in density, the film appears darker
A dental patient has thick soft tissues and dense bones. To compensate for this increase in subject thickness and provide a film of diagnostic density, the dental radiographer may
Increase the exposure time, or
Increase the milliamperage, or
Increase the operating kVp
The difference in the degrees of blackness between adjacent areas on a dental radiograph is termed
contrast
When viewed on a light source, a dental radiograph that demonstrates many shades of gray is said to have
low contrast
When viewed on a light source, a dental radiograph that demonstrates very dark areas and very light areas is said to have
high contrast
The one exposure factor that has a direct influence on the contrast of a dental radiograph is
operating kVp
The type of contrast preferred in dental radiography
a compromise between short-scale contrast and long-scale contrast
The stepwedge is used for all the following except
To increase pentrating quality of the x-ray beam
The capability of the x-ray film to reproduce distinct outlines of an object is termed
sharpness
The unsharpness or blurred edges seen on a radiographic image is termed
Penumbra
The geometric characteristic that refers to a radiographic image that appears larger than its actual size is termed
Magnification
A variation in the true size and shape of the object being radiographed is termed
Distortion
Decrease focal spot size =
increase sharpness
Increase crystal size =
decrease sharpness
Decrease crystal size =
increase sharpness
Decrease movement =
increase sharpness
Increase movement =
decrease sharpness
Increase target-film distance =
decrease magnification
Increase object-film distance =
increase magnification
Decrease object-film distance =
decrease magnification
Object and film are parallel =
decrease distortion
Beam perpendicular to object and film =
decrease distortion
Beam not perpendicular to object and film =
increase distortion