DENT 1050 Chapter 8 Flashcards
The portion of a processed radiograph that appears dark or black is termed:
a. dense
b. radiolucent
c. radiopaque
d. transparent
b. radiolucent
The portion of a processed radiograph that appears light or white is termed:
a. radiolucent
b. radiopaque
c. dense
d. high density
b. radiopaque
Which of the following appears most radiolucent on a dental radiograph?
a. bone
b. enamel
c. dentin
d. air space
d. air space
An example of a radiopaque structure seen on dental x-rays is:
a. bone
b. enamel
c. dentin
d. all of the above
d. all of the above
The overall blackness or darkness of a dental radiograph is termed:
a. density
b. contrast
c. subject thickness
d. diagnostic quality
a. density
Increasing the milliamperage (mA) will cause:
a. an increase in density; the image appears darker
b. an increase in density; the image appears lighter
c. a decrease in density; the image appears darker
d. a decrease in density; the image appears lighter
a. an increase in density; the image appears darker
Increasing the operating kilovoltage peak (kVp) will cause:
a. an increase in density; the image appears darker
b. an increase in density; the image appears lighter
c. a decrease in density; the image appears darker
d. a decrease in density; the image appears lighter
a. an increase in density; the image appears darker
Increasing the exposure time will cause:
a. an increase in density; the image appears darker
b. an increase in density; the image appears lighter
c. a decrease in density; the image appears darker
d. a decrease in density; the image appears lighter
a. 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 dental radiographer may:
a. increase the exposure time
b. increase the milliamperage
c. increase the operating kilovoltage peak
d. any of the above
d. any of the above
The difference in the degrees of blackness between adjacent areas on a dental radiograph is termed:
a. density
b. contrast
c. subject thickness
d. diagnostic quality
b. contrast
When viewed on a light source, a dental radiograph that demonstrates many shades of gray is said to have:
a. high contrast
b. low contrast
c. high density
d. low density
b. low contrast
When viewed on a light source, a dental radiograph that demonstrates very dark areas and very light areas is said to have:
a. high contrast
b. low contrast
c. high density
d. low density
a. high contrast
In figure 8-16, which diagram exhibits high contrast?
a. A
b. B
c. C
b. B (one black, one gray, one large white)
In figure 8-16, which diagram exhibits low contrast?
a. A
b. B
c. C
a. A (many shades of gray)
In figure 8-16, which diagram exhibits long-scale contrast?
a. A
b. B
c. C
a. A (many shades of gray)
In figure 8-16, which diagram exhibits short-scale contrast?
a. A
b. B
c. C
b. B (one black, one gray, one large white)
In figure 8-16, which diagram exhibits no contrast?
a. A
b. B
c. C
c. C (completely gray)
The one exposure factor that has a direct influence on the contrast of a dental radiograph is:
a. operating kilovoltage peak
b. milliamperage
c. exposure time
d. subject thickness
a. operating kilovoltage peak
The type of contrast preferred in dental radiography is:
a. low contrast
b. long-scale contrast only
c. short-scale contrast only
d. a compromise between short-scale contrast and long-scale contrast
d. a compromise between short-scale contrast and long-scale contrast
The stepwedge is used for all of the following EXCEPT:
a. to demonstrate short-scale and long-scale contrast
b. to monitor quality control of film processing
c. to increase the penetrating quality of the x-ray beam
d. to demonstrate densities
c. to increase the penetrating quality of the x-ray beam
The capability of the receptor to reproduce distinct outlines of an object is termed:
a. sharpness
b. magnification
c. distortion
d. diagnostic quality
a. sharpness
The unsharpness or blurred edges seen on a radiographic image is termed:
a. distortion
b. umbra
c. penumbra
d. contrast
c. penumbra
The geometric characteristic that refers to a radiographic image that appears larger than its actual size is termed:
a. distortion
b. detail
c. definition
d. magnification
d. magnification
A variation in the true size and shape of the object being radiographed is termed:
a. magnification
b. distortion
c. sharpness
d. resolution
b. distortion
Fill in the blank:
Decrease focal spot size = _______ sharpness
Increase
Fill in the blank:
Increase crystal size = _______ sharpness
decrease
Fill in the blank:
Decrease crystal size = _______ sharpness
increase
Fill in the blank:
Decrease movement = _______ sharpness
increase
Fill in the blank:
Increase movement = _______ sharpness
decrease
Fill in the blank:
Increase target-receptor distance = _______ magnification
decrease
Fill in the blank:
Increase object-receptor distance = _______ magnification
increase
Fill in the blank:
Decrease object-receptor distance = _______ magnification
decrease
Fill in the blank:
Object and receptor are parallel = _______ distortion
decrease
Fill in the blank:
Beam perpendicular to object and receptor = _______ distortion
decrease
Fill in the blank:
Beam not perpendicular to object and receptor = _______ distortion
increase
Contrast
define
Contrast, high
define
Contrast, long-scale
define
Contrast, low
define
Contrast, film
define
Contrast, scale of
define
Contrast, short scale
define
Contrast, subject
define
Density
define
Distance, object-receptor
define
Distance, target-receptor
define
Distortion
define
Exposure factors
define
Exposure time
define
Focal spot
define
Magnification
define
Milliamperage
define
Operating kilovoltage peak
define
Penumbra
define
Radiograph, diagnostic
define
Radiolucent
define
Radiopaque
define
Sharpness
define
Stepwedge
define
Subject thickness
define
