DENT 1050 Chapter 8

Question 1

The portion of a processed radiograph that appears dark or black is termed:

a. dense
b. radiolucent
c. radiopaque
d. transparent

Answer 1

b. radiolucent

Question 2

The portion of a processed radiograph that appears light or white is termed:

a. radiolucent
b. radiopaque
c. dense
d. high density

Answer 2

b. radiopaque

Question 3

Which of the following appears most radiolucent on a dental radiograph?

a. bone
b. enamel
c. dentin
d. air space

Answer 3

d. air space

Question 4

An example of a radiopaque structure seen on dental x-rays is:

a. bone
b. enamel
c. dentin
d. all of the above

Answer 4

d. all of the above

Question 5

The overall blackness or darkness of a dental radiograph is termed:

a. density
b. contrast
c. subject thickness
d. diagnostic quality

Answer 5

a. density

Question 6

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

Answer 6

a. an increase in density; the image appears darker

Question 7

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

Answer 7

a. an increase in density; the image appears darker

Question 8

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

Answer 8

a. an increase in density; the image appears darker

Question 9

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

Answer 9

d. any of the above

Question 10

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

Answer 10

b. contrast

Question 11

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

Answer 11

b. low contrast

Question 12

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

Answer 12

a. high contrast

Question 13

In figure 8-16, which diagram exhibits high contrast?

a. A
b. B
c. C

Answer 13

b. B (one black, one gray, one large white)

Question 14

In figure 8-16, which diagram exhibits low contrast?

a. A
b. B
c. C

Answer 14

a. A (many shades of gray)

Question 15

In figure 8-16, which diagram exhibits long-scale contrast?

a. A
b. B
c. C

Answer 15

a. A (many shades of gray)

Question 16

In figure 8-16, which diagram exhibits short-scale contrast?

a. A
b. B
c. C

Answer 16

b. B (one black, one gray, one large white)

Question 17

In figure 8-16, which diagram exhibits no contrast?

a. A
b. B
c. C

Answer 17

c. C (completely gray)

Question 18

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

Answer 18

a. operating kilovoltage peak

Question 19

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

Answer 19

d. a compromise between short-scale contrast and long-scale contrast

Question 20

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

Answer 20

c. to increase the penetrating quality of the x-ray beam

Question 21

The capability of the receptor to reproduce distinct outlines of an object is termed:

a. sharpness
b. magnification
c. distortion
d. diagnostic quality

Answer 21

a. sharpness

Question 22

The unsharpness or blurred edges seen on a radiographic image is termed:

a. distortion
b. umbra
c. penumbra
d. contrast

Answer 22

c. penumbra

Question 23

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

Answer 23

d. magnification

Question 24

A variation in the true size and shape of the object being radiographed is termed:

a. magnification
b. distortion
c. sharpness
d. resolution

Answer 24

b. distortion

Question 25

Fill in the blank: | Decrease focal spot size = _______ sharpness

Answer 25

Increase

Question 26

Fill in the blank: | Increase crystal size = _______ sharpness

Answer 26

decrease

Question 27

Fill in the blank: | Decrease crystal size = _______ sharpness

Answer 27

increase

Question 28

Fill in the blank: | Decrease movement = _______ sharpness

Answer 28

increase

Question 29

Fill in the blank: | Increase movement = _______ sharpness

Answer 29

decrease

Question 30

Fill in the blank: | Increase target-receptor distance = _______ magnification

Answer 30

decrease

Question 31

Fill in the blank: | Increase object-receptor distance = _______ magnification

Answer 31

increase

Question 32

Fill in the blank: | Decrease object-receptor distance = _______ magnification

Answer 32

decrease

Question 33

Fill in the blank: | Object and receptor are parallel = _______ distortion

Answer 33

decrease

Question 34

Fill in the blank: | Beam perpendicular to object and receptor = _______ distortion

Answer 34

decrease

Question 35

Fill in the blank: | Beam not perpendicular to object and receptor = _______ distortion

Answer 35

increase

Question 36

Contrast

Answer 36

define

Question 37

Contrast, high

Answer 37

define

Question 38

Contrast, long-scale

Answer 38

define

Question 39

Contrast, low

Answer 39

define

Question 40

Contrast, film

Answer 40

define

Question 41

Contrast, scale of

Answer 41

define

Question 42

Contrast, short scale

Answer 42

define

Question 43

Contrast, subject

Answer 43

define

Question 44

Density

Answer 44

define

Question 45

Distance, object-receptor

Answer 45

define

Question 46

Distance, target-receptor

Answer 46

define

Question 47

Distortion

Answer 47

define

Question 48

Exposure factors

Answer 48

define

Question 49

Exposure time

Answer 49

define

Question 50

Focal spot

Answer 50

define

Question 51

Magnification

Answer 51

define

Question 52

Milliamperage

Answer 52

define

Question 53

Operating kilovoltage peak

Answer 53

define

Question 54

Penumbra

Answer 54

define

Question 55

Radiograph, diagnostic

Answer 55

define

Question 56

Radiolucent

Answer 56

define

Question 57

Radiopaque

Answer 57

define

Question 58

Sharpness

Answer 58

define

Question 59

Stepwedge

Answer 59

define

Question 60

Subject thickness

Answer 60

define