Deck 9: Image Evaluation

Question 1

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

Answer 1

None of the above

Question 2

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

Answer 2

Overexposed; reduced by a factor of four

Question 3

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

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

Answer 3

No change in; decreased

Question 4

When using a digital imaging system, changing from 8 $\times$ 10 collimation to 14 $\times$ 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 5

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 6

When using a digital imaging system, changing from 40" SID to 72" 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 7

When using a film-screen imaging system, changing from a 200 to a 400 speed system would result in _____________ density and ____________ spatial resolution.

A) No change in; no change in
B) Decreased; increased
C) No change in; decreased
D) Increased; decreased

Question 8

When using a film-screen imaging system, increasing the central angle would result in _____________ density and ____________ spatial resolution.

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

Question 9

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 10

When using a film-screen imaging system, changing from 85 to 70 kVp would result in _____________ density and ____________ contrast.

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

Question 11

A film-screen image produced using 16 mAs @ 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 @ 80 kVp
B) 8 mAs @ 80 kVp
C) 8 mAs @ 68 kVp
D) 16 mAs @ 68 kVp

Question 12

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

Question 13

When using a digital imaging system, changing from no grid to an 8:1 ratio grid would result in _____________ brightness and ____________ spatial resolution.

A) Increased; no change in
B) Decreased; increased
C) No change in; decreased
D) No change in; no change in

Question 14

When using a digital imaging system, changing from 70 to 85 kVp would result in _____________ brightness and ____________ spatial resolution.

A) Increased; no change in
B) Decreased; increased
C) No change in; decreased
D) No change in; no change in