Chapter 8 Flashcards
The portion of a dental image that appears dark or black is termed:
Radiolucent
The portion of the dental image that appears light or white is termed:
Radiopaque
Which appears most radiolucent on a dental image?
Air space
Which appears most radiopaque on a dental image?
Bone, enamel, dentin (all of the above)
The overall blackness or darkness of a dental image is termed:
Density
Increasing the milliamperage (mA) will cause:
An increase in density; the image appears darker
Increasing the operating kilovoltage (kV) will cause:
An increase in density; the image appears darker
Increasing the exposure time will cause:
An increase in density; the image appears darker
A dental patient has thick soft tissues and dense bones. To compensate for this increase in subject thickness and to provide an image of diagnostic density, the radiographer may:
Increase the exposure time, increase the milliamperage, increase the kilovoltage (all of the above)
The difference in the degrees of densities between adjacent areas on a dental image is termed:
Contrast
A dental image that demonstrates many shades of gray is said to have:
Low contrast
A dental image 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 image is:
Kilovoltage
The type of contrast preferred in dental imaging is:
A compromise between short scale contrast and long scale contrast
The stepwedge is used for all of the following except:
To increase the penetrating quality of the x-ray beam
The capability of the receptor to reproduce distinct outlines of an object is termed:
Sharpness
The unsharp or blurred edges seen on an image are termed:
Penumbra
The geometric characteristic that refers to an image that appears larger than its actual size is termed:
Magnification
A variation in the true size and shape of the object being imaged is termed:
Distortion
Decrease focal spot size equals ———- sharpness.
Increase
Increase crystal size equals ————- sharpness.
Decrease
Decrease crystal size equals ———- sharpness.
Increase
Decrease movement equals——- sharpness.
Increase
Increase movement equals ————- sharpness.
Decrease
