Deck 6: Radiographic Image Artifacts

Question 1

Which of the following artifacts can occur in both CR and film/screen radiography?

A) Static electricity
B) Wet-pressure sensitization
C) Moiré pattern
D) Water spots

Answer 1

C
Moire patterns can occur in both if certain grids are misused.

Question 2

Which of the following can occur as a result of a double set of grid lines?

A) Grid misalignment
B) Film fog
C) Static artifacts
D) Moiré effect

Answer 2

D
Moiré effect, or zebra pattern artifact, is a double set of grid lines caused by the placement of a grid cassette in a Bucky.

Question 3

Patient motion during exposure results in _____ artifact.

A) a processing
B) an exposure
C) a handling
D) no

Answer 3

B
Patient motion is considered to be an exposure artifact.

Question 4

_______ can appear as dark bands at the interfaces of structures that differ widely in brightness level such as barium examinations or metal prosthesis.

A) Electronic noise
B) Halo artifacts
C) Dirt or debris on the front of the
D) Dropped pixels

Question 5

Pi lines are so named because they

A) occur at regular intervals.
B) occur on the finished radiograph.
C) appear as a section of pie.
D) None of the above are correct.

Question 6

Which of the following will run in the same direction as that of film travel?

A) Pi lines
B) Hesitation lines
C) Guide shoe marks
D) All of the answer options are correct.

Question 7

A chemical fog artifact

A) is an exposure artifact.
B) appears as streaks.
C) results in lower contrast.
D) results in lower optical density.

Question 8

If residual thiosulfate is not properly removed during washing, the radiograph will

A) be underdeveloped.
B) be overdeveloped.
C) turn blue.
D) turn brown.

Question 9

Wet pressure sensitization would be classified as _____ artifact.

A) an exposure
B) a processing
C) a handling
D) no

Question 10

Data for determining repeat rates should include at least ____ patients to obtain a statistical sample large enough for valid results.

A) 100
B) 150
C) 250
D) 500