Deck 3: Image Formation

Question 1

Scatter radiation can be reduced by all of the following methods EXCEPT one.Which one is the EXCEPTION?

A)Open-ended PIDs
B)Higher kV settings
C)Lead foil inside the film packet
D)Using as small a beam as possible

Answer 1

Higher kV settings

Question 2

The sharpness of an image is determined by being able to distinguish the outlines of an object and the ability of the dental image to mimic the smallest details of an object or structure.The size of the target or focal area may influence sharpness.

A)Both statements are true.
B)Both statements are false.
C)The first statement is true,the second is false.
D)The first statement is false,the second is true.

Answer 2

Both statements are true.

Question 3

High-contrast images are referred to as long-scale contrast films.

Answer 3

False

Question 4

The most common cause of poor definition in a radiograph is movement.

Question 5

In order to increase the contrast on a radiograph one should decrease the kVp.

Question 6

Penumbra can be described as:

A)detail.
B)blurring.
C)definition.
D)sharpness.

Question 7

Object contrast is determined by all of the following EXCEPT one.Which one is the EXCEPTION?

A)Scatter radiation
B)Density of the object
C)Quantity of the x-rays
D)Chemical composition of the object

Question 8

Identify the source-to-film distance (FFD)which produces the most amount of image magnification:

A)6 inches.
B)8 inches.
C)12 inches.
D)16 inches.

Question 9

When viewing film-based,conventional radiographs the practitioner should always view the processed radiograph:

A)unmounted.
B)on a viewbox.
C)in the darkroom.
D)using ambient light.

Question 10

A step wedge consists of plates of increasing thickness.As the wedge gets thicker,there is an increase in x-ray penetration due to the object density.

A)Both statements are true.
B)Both statements are false.
C)The first statement is true,the second is false.
D)The first statement is false,the second is true.

Question 11

Short-scale contrasts produce shades of gray.

Question 12

All of the following will keep the penumbra as small as possible EXCEPT one.Which one is the EXCEPTION?

A)Small focal spot
B)Angulation of the target
C)Increased target-object distance
D)Increased object-receptor distance

Question 13

All of the following are enhancing options on the digital system that are useful when viewing the digital image EXCEPT one.Which one is the EXCEPTION?

A)Using an illuminator
B)Changing the density
C)Changing the contrast
D)Magnifying the image

Question 14

The degree of blackness on an image is known as:

A)umbra.
B)density.
C)contrast.
D)penumbra.

Question 15

What is the advantage of the recessed tube or recessed target design?

A)Target-receptor distance (FFD)increases by half
B)Target-receptor distance (FFD)decreases by half
C)Extended focal distance and the elimination of the longer PID
D)Decreased focal distance and the elimination of the longer PID

Question 16

Long-scale contrast gives the radiograph a (an):

A)gray appearance.
B)fogged appearance.
C)black and white appearance.
D)underpenetrated appearance.

Question 17

When using the bisecting method,the object-film distance is kept to a minimum.

Question 18

Kilovoltage in the 45- to below 60-kV range can produce a diagnostic image,but should not be used because of the amount of secondary (scatter)radiation produced.

A)Both statements are true.
B)Both statements are false.
C)The first statement is true,the second is false.
D)The first statement is false,the second is true.

Question 19

Film fog is caused by which of the following?

A)Scattered radiation
B)Intensifying screens
C)Properties of the film
D)Amount of radiation transmitted

Question 20

With regard to the inverse square law,if the focal spot-to-film distance (FFD)doubles,the exposure time should:

A)decrease by .
B)Decrease by .
C)double.
D)quadruple.