Quiz 4 Chapter 8

Question 1

The portion of a dental image that appears dark or black is termed:

Answer 1

Radiolucent

Question 2

The portion of a dental image that appears light or white is termed

Answer 2

Radiopaque

Question 3

Which appears most radiolucent on a dental image?

Answer 3

air space

Question 4

The overall blackness or darkness of a dental image is termed

Answer 4

Density

Question 5

Increasing the mA will cause

Answer 5

an increase in density, the image appears darker

Question 6

Increasing the operating kilovoltage will cause:

Answer 6

an increase in density the image appears darker

Question 7

Increasing the exposure time will cause

Answer 7

an increase in density, the image appears darker

Question 8

A dental patient has thick soft tissues and dense bones. To compensate for this increase in subject thickness and to provide an image of diagnositc density, the dental radiographer may:

Answer 8

increase milliamperage
increase the exposure time
increase the kilovoltage

Question 9

The difference in the degrees of densities between adjacent areas on a dental image is termed:

Answer 9

contrast

Question 10

A dental image that demonstrates many shades of gray is said to have

Answer 10

low contrast

Question 11

A dental image that demonstrates very dark areas and very light areas

Answer 11

high contrast

Question 12

Fig 8-16 what exhibits high contrast

Answer 12

A

Question 13

Fig 8-16 what exhibits low contrast

Answer 13

B

Question 14

Fig 8-16 what exhibits long scale contrast

Answer 14

A

Question 15

Fig 8-16 what exhibits short scale contrast

Answer 15

B

Question 16

Fig 8-16 Which exhibits no contrast

Answer 16

C

Question 17

The one exposure factor that has a direct influence on the contrast of a dental image is

Answer 17

kilovoltage

Question 18

The type of contrast preferred in dental imaging is:

Answer 18

low contrast

Question 19

The stepwedge is used for all of the following except

Answer 19

to increase the penetrating quality of the x ray beam

Question 20

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

Answer 20

distortion

Question 21

The unsharp or blurred edges seen on an image are termed

Answer 21

penumbra

Question 22

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

Answer 22

distortion

Question 23

Decrease focal spot size

Answer 23

increase sharpness

Question 24

Increase movement ___

Answer 24

decrease sharpness

Question 25

Increase Crystal size

Answer 25

decrease sharpness

Question 26

Decrease crystal size ___

Answer 26

increase sharpness

Question 27

Decrease object receptor distance

Answer 27

increase sharpness

Question 28

Increase target receptor distance =

Answer 28

decreases magnification

Question 29

Increase object-receptor distance =

Answer 29

increase magnification

Question 30

Decrease object receptor distance

Answer 30

decrease magnification

Question 31

Object and receptor are parallel

Answer 31

decrease distortion

Question 32

Beam perpendicular to object and receptor

Answer 32

decrease distortion

Question 33

Beam not perpendicular to object and receptor =

Answer 33

increase distortion