Deck 9: Image Evaluation

Question 1

A digital image with decreased spatial resolution may be due to:
1)Increased central ray angulation
2)Decreased grid ratio
3)Decreased SID

A) 1 and 2 only.
B) 1 and 3 only.
C) 2 and 3 only.
D) 1, 2, and 3.

Answer 1

1 and 3 only.

Question 2

A film-screen image with increased recorded detail may be due to:
1)Increased SID
2)Decreased focal spot size
3)Decreased film-screen speed

A) 1 and 2 only.
B) 1 and 3 only.
C) 2 and 3 only.
D) 1, 2, and 3.

Answer 2

1, 2, and 3.

Question 3

Using a Konica digital imaging system,if an image's S number is 600 while the optimal range ends at 300,this means that the IR was ______________ and the exposure to the IR needs to be ___________________.

A) underexposed; doubled
B) under exposed; halved
C) overexposed; doubled
D) overexposed; halved

Answer 3

underexposed; doubled

Question 4

A film-screen image with decreased distortion may be due to:
1)Decreased patient thickness
2)Increased SID
3)Increased focal spot size

A) 1 and 2 only.
B) 1 and 3 only.
C) 2 and 3 only.
D) 1, 2, and 3.

Question 5

A digital image with higher contrast may be due to:
1)Decreased kVp
2)Increased grid ratio
3)Decreased patient thickness

A) 1 and 2 only.
B) 1 and 3 only.
C) 2 and 3 only.
D) 1, 2, and 3.

Question 6

A film-screen image with increased density may be due to:
1)Increased OID
2)Decreased SID
3)Increased film-screen speed

A) 1 and 2 only.
B) 1 and 3 only.
C) 2 and 3 only.
D) 1, 2, and 3.

Question 7

An area of decreased brightness visualized on a computer monitor has ________density on a film image.

A) increased
B) decreased
C) no

Question 8

When using a film-screen imaging system,changing from small to large focal spot size would result in _____________ density and ____________ recorded detail.

A) no change in; no change in
B) decreased; increased
C) no change in; decreased
D) decreased; decreased

Question 9

The amount of luminance (light emission)of a display monitor is the:

A) density.
B) contrast.
C) SID.
D) brightness.

Question 10

Using an Agfa digital imaging system,if an image's exposure indicator is 2.3 lgM while the optimal range begins at 2.6 lgM,this means that the IR was ______________ and the exposure to the IR needs to be ___________________ .

A) underexposed; increased by 30%
B) underexposed; increased by a factor of two
C) overexposed; decreased by 30%
D) overexposed; decreased by a factor of two

Question 11

When using a digital imaging system,changing from 8 × 10 collimation to 14 × 17 collimation would result in _____________ brightness and ____________ contrast.

A) no change in; no change in
B) decreased; increased
C) no change in; decreased
D) decreased; decreased

Question 12

The visibility of anatomic structures in a radiographic image is determined by:

A) spatial resolution and image contrast.
B) brightness/density and image contrast.
C) spatial resolution and brightness/density.
D) all of the above.

Question 13

A digital image with increased distortion may be due to:
1)Decreased OID
2)Increased CR angulation
3)Decreased SID

A)1 and 2 only.
B)1 and 3 only.
C)2 and 3 only.
D)1,2,and 3.

Question 14

When using a digital imaging system,changing from 40 in SID to 72 in SID would result in _____________ brightness and ____________ contrast.

A) no change in; no change in
B) decreased; increased
C) no change in; decreased
D) decreased; decreased

Question 15

A film-screen image with lower contrast may be due to:
1)Increased patient thickness
2)Increased beam restriction
3)Increased kVp

A) 1 and 2 only.
B) 1 and 3 only.
C) 2 and 3 only.
D) 1, 2, and 3.

Question 16

A film-screen image produced using 16 mAs at 80 kVp has to be repeated because it is too dark.Which of the following exposure factors would be the best choice to correct the problem?

A) 4 mAs at 80 kVp
B) 8 mAs at 80 kVp
C) 8 mAs at 68 kVp
D) 16 mAs at 68 kVp

Question 17

Which of the following changes would produce a digital image with decreased brightness?

A) Increased mAs
B) Decreased kVp
C) Increased patient thickness
D) None of the above

Question 18

Using a Carestream digital imaging system,if an image's EI number is 1800 while the optimal range ends at 1200,this means that the IR was ______________ and the exposure to the IR needs to be ___________________.

A) underexposed; doubled
B) underexposed; increased by a factor of four
C) overexposed; halved
D) overexposed; reduced by a factor of four

Question 19

The amount of overall blackness on the processed image is the:

A) density.
B) contrast.
C) SID.
D) brightness.

Question 20

The variation in brightness and density on digital or film imaging is the:

A) density.
B) contrast.
C) SID.
D) brightness.

Question 21

In order to produce a radiographic image with structural lines as accurate as possible,you must maximize the spatial resolution and distortion.

Question 22

Assuming no other changes are made,which of the following would result in increased quantum noise in a digital image?
1)Decreasing mAs
2)Increasing kVp
3)Imaging a thicker part

A) 1 and 2 only
B) 1 and 3 only
C) 2 and 3 only
D) 1, 2, and 3

Question 23

Which of the following would reduce quantum noise in a digital image?
1)Decreasing mAs
2)Increasing mAs
3)Changing to a lower ratio grid

A) 1 and 2 only
B) 1 and 3 only
C) 2 and 3 only
D) 1, 2, and 3

Question 24

Artifacts are detrimental to radiographs because they can make the visibility of anatomy,pathologic conditions,or patient identification information difficult or impossible.

Question 25

______________ is a universal standard value that reflects the difference between the desired or target exposure to the IR and the actual exposure to the IR.

A) Exposure index
B) Sensitivity number
C) Deviation index
D) Log median number