Question 1

Image receptor contrast is expressed as the ____ of the D log E curve.

Accepted Answer

A)  slope
B)  toe
C)  shoulder
D)  straight lineE) A) and D)
F) B) and D)

Question 2

Match the following terms with the correct statement below.
-responsible for high contrast densities on images

Accepted Answer

A)  average gradient
B)  long scale contrast
C)  Compton interactions
D)  low contrast
E)  short scale contrastF) high contrastG) photoelectric interactionsH) subject contrastI) B) and C)
J) C) and G) G

Question 3

What should you expect to occur with a decrease in kVp?

Accepted Answer

A)  longer scale contrast
B)  more Compton interactions
C)  lower contrast
D)  more photoelectric interactionsE) None of the above
F) A) and B)

Question 4

kVp controls the proportional relationship

Accepted Answer

A)  mAs and kVp.
B)  Compton and photoelectric interactions.
C)  photoelectric and characteristic interactions.
D)  SID and patient thickness.E) A) and D)
F) A) and C)

Question 5

As the slope of the D log E curve ____, contrast ____.

Accepted Answer

A)  increases; decreases
B)  decreases; increases
C)  increases; increases
D)  moves closer to vertical; decreasesE) A) and D)
F) A) and C)

Question 6

A radiograph that demonstrates considerable differences between densities is called

Accepted Answer

A)  long scale.
B)  low contrast.
C)  high contrast.
D)  all of the aboveE) A) and B)
F) A) and C)

Question 7

Depending upon the kVp range, a visible change in contrast will not be seen unless kVp is minimally changed

Accepted Answer

A)  2-3%.
B)  4-12%.
C)  25%.
D)  50%.E) A) and C)
F) B) and D)

Question 8

A radiograph with few shades of gray exhibits

Accepted Answer

A)  low contrast.
B)  high contrast.
C)  medium contrast.
D)  long scale contrast.E) A) and C)
F) A) and D)

Question 9

A radiograph that demonstrates minimal differences between density shades is called

Accepted Answer

A)  short scale.
B)  low contrast.
C)  high contrast.
D)  all of the aboveE) A) and D)
F) C) and D) B

Question 10

A increase in x-ray beam filtration

Accepted Answer

A)  increases the number of Compton interactions.
B)  reduces contrast.
C)  increases the average photon energy.
D)  all of the aboveE) All of the above
F) B) and C)

Question 11

Contrast increases with all of the following EXCEPT

Accepted Answer

A)  decreased kVp.
B)  decreased field size.
C)  decreased part thickness.
D)  increased scatter.E) All of the above
F) A) and B)

Question 12

All of the following factors would affect radiographic contrast EXCEPT

Accepted Answer

A)  field size.
B)  SID and OID.
C)  receptor characteristics.
D)  focal spot selection.E) B) and D)
F) A) and D)

Question 13

High contrast is directly related to

Accepted Answer

A)  the number of photoelectric interactions.
B)  high kVp.
C)  the amount of Compton scatter.
D)  mAs.E) A) and C)
F) None of the above

Question 14

Which of the choices below does not increase contrast?

Accepted Answer

A)  increasing grid ratio
B)  increasing the amount of irradiated tissue
C)  decreasing filtration
D)  decreasing kVpE) A) and C)
F) C) and D)

Question 15

After completing a radiograph using 27 mAs at 90 kVp, the image demonstrates adequate overall density but an area that is underpenetrated.In order to produce an optimum image in terms of contrast and penetration, the repeat image should be taken at

Accepted Answer

A)  27 mAs and 100 kVp.
B)  54 mAs and 77 kVp.
C)  13 mAs and 94 kVp.
D)  27 mAs and 94 kVp.E) All of the above
F) A) and D)

Question 16

Match the following terms with the correct statement below.
-used to calculate slope of the H and D curve

Accepted Answer

A)  average gradient
B)  long scale contrast
C)  Compton interactions
D)  low contrast
E)  short scale contrastF) high contrastG) photoelectric interactionsH) subject contrastI) A) and E)
J) E) and G)

Question 17

In order to reduce patient entrance skin exposure (ESE) , higher kVp exposures are a consideration.It is important to remember that

Accepted Answer

A)  kVp values that are too high reduce density and recorded detail.
B)  kVp values that are too high produce more scatter and reduce contrast.
C)  a significant loss of image contrast is not a reason to avoid higher kVp values in order to reduce ESE.
D)  the digital processing software will correct for any kVp value regardless of how high it is in value.E) A) and D)
F) A) and C)

Question 18

Match the following terms with the correct statement below.
-the same as low contrast

Accepted Answer

A)  average gradient
B)  long scale contrast
C)  Compton interactions
D)  low contrast
E)  short scale contrastF) high contrastG) photoelectric interactionsH) subject contrastI) B) and H)
J) B) and D)

Question 19

The concept of contrast as it is displayed on a soft-copy monitor for digital images is described as

Accepted Answer

A)  window width.
B)  dynamic range.
C)  contrast width.
D)  window range.E) A) and B)
F) None of the above

Question 20

With digital imaging systems, the primary factors affecting final image contrast are the

Accepted Answer

A)  window level and brightness.
B)  histogram and look-up-table (LUT) .
C)  EI numbers and grid ratio.
D)  kVp and mAs.E) A) and B)
F) C) and D) B

Exam 27: Contrast

Image receptor contrast is expressed as the ____ of the D log E curve.

Correct AnswerverifiedShow Answer

Match the following terms with the correct statement below. -responsible for high contrast densities on images

Correct AnswerverifiedG

What should you expect to occur with a decrease in kVp?

Correct AnswerverifiedShow Answer

kVp controls the proportional relationship

Correct AnswerverifiedShow Answer

As the slope of the D log E curve ____, contrast ____.

Correct AnswerverifiedShow Answer

A radiograph that demonstrates considerable differences between densities is called

Correct AnswerverifiedShow Answer

Depending upon the kVp range, a visible change in contrast will not be seen unless kVp is minimally changed

Correct AnswerverifiedShow Answer

A radiograph with few shades of gray exhibits

Correct AnswerverifiedShow Answer

A radiograph that demonstrates minimal differences between density shades is called

Correct AnswerverifiedB

A increase in x-ray beam filtration

Correct AnswerverifiedShow Answer

Contrast increases with all of the following EXCEPT

Correct AnswerverifiedShow Answer

All of the following factors would affect radiographic contrast EXCEPT

Correct AnswerverifiedShow Answer

High contrast is directly related to

Correct AnswerverifiedShow Answer

Which of the choices below does not increase contrast?

Correct AnswerverifiedShow Answer

After completing a radiograph using 27 mAs at 90 kVp, the image demonstrates adequate overall density but an area that is underpenetrated.In order to produce an optimum image in terms of contrast and penetration, the repeat image should be taken at

Correct AnswerverifiedShow Answer

Match the following terms with the correct statement below. -used to calculate slope of the H and D curve

Correct AnswerverifiedShow Answer

In order to reduce patient entrance skin exposure (ESE) , higher kVp exposures are a consideration.It is important to remember that

Correct AnswerverifiedShow Answer

Match the following terms with the correct statement below. -the same as low contrast

Correct AnswerverifiedShow Answer

The concept of contrast as it is displayed on a soft-copy monitor for digital images is described as

Correct AnswerverifiedShow Answer

With digital imaging systems, the primary factors affecting final image contrast are the

Correct AnswerverifiedB

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G

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As the slope of the D log E curve , contrast .

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B

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B