Dental Radiography Ch. 8 Quiz Questions

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 =

increase 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