Deck 4: Radiographic Image Quality: Photographic Properties

Question 1

Kilovoltage does not affect radiographic density until adequate penetration is reached.

Answer 1

True

Question 2

An image with low contrast appears:

A) black and white.
B) very gray.
C) very dark.
D) very light.

Answer 2

very gray.

Question 3

What is the minimum change in mAs that would result in a visible change in radiographic density?

A) 10%
B) 15%
C) 30%
D) 100%

Answer 3

30%

Question 4

For a given exposure technique, increasing part thickness decreases radiographic density.

Question 5

A radiograph with few densities but great differences among them is said to have:

A) high contrast.
B) low contrast.
C) long-scale contrast.
D) medium-scale contrast.

Question 6

If a person stands 12 feet from the source of exposure, receives an exposure of 16 R/min, and then moves to 3 feet from the source of exposure, what would be the new exposure rate according to the inverse square law?

A) 1 R/min
B) 4 R/min
C) 64 R/min
D) 256 R/min

Question 7

As it applies to a radiograph, density is:

A) the difference between two dark areas approximately 2.5 cm apart.
B) the measurement of the overall blackening on the radiographic image.
C) the measurement of the difference in the blackening on the radiographic film.
D) the difference between similar shades of gray.

Question 8

If the first radiograph of a foot is done using 4 mAs at 40 inches and a second radiograph is done using 50 inches, how much mAs should be used to maintain density?

A) 1 mAs
B) 2 mAs
C) 6 mAs
D) 12 mAs

Question 9

If a person stands 3 feet from the source of exposure, receives an exposure of 16 R/min, and then moves to 6 feet from the source of exposure, what would be the new exposure rate according to the inverse square law?

A) 1 R/min
B) 4 R/min
C) 64 R/min
D) 256 R/min

Question 10

For every _____ of part thickness, the radiographer should adjust the mAs by a factor of 2.

A) 2-3 cm
B) 4-5 cm
C) 6-7 cm
D) 8-9 cm

Question 11

A quality radiograph is done using 10 mAs, 70 kVp and a 12:1 ratio grid. How much mAs is needed to produce an image with the same density when the grid is removed?

A) 2 mAs
B) 5 mAs
C) 15 mAs
D) 50 mAs

Question 12

Considering the primary controller of radiographic density, which film has the greatest density?

A) 300 mA, 0.2 second
B) 400 mA, 0.2 second
C) 100 mA, 1 second
D) 800 mA, 0.001 second

Question 13

If mAs were fixed, which kVp would produce the greatest density?

A) 70 kVp
B) 80 kVp
C) 90 kVp
D) 100 kVp

Question 14

Density is a _____ property of the radiographic image.

A) photographic
B) geometric
C) detail
D) b and c

Question 15

If the first radiograph of a chest is done using 72 inches and 12 mAs and a second radiograph is done using 40 inches, how much mAs should be used to maintain density?

A) 2 mAs
B) 4 mAs
C) 7 mAs
D) 9 mAs

Question 16

Considering the primary controller of radiographic density, which film has the greatest density?

A) 300 mA, 1 second
B) 400 mA, 2 seconds
C) 100 mA, 0.5 second
D) 800 mA, 0.01 second

Question 17

Contrast is a _____ property of the radiographic image.

A) photographic
B) geometric
C) detail
D) a and c

Question 18

If the kVp were decreased by 15% and no changes were made to the mAs:

A) density would be unchanged and contrast would decrease.
B) density would increase and contrast would decrease.
C) density would decrease and contrast would increase.
D) there would be no change in either contrast or density.

Question 19

What is the primary controller of image contrast?

A) kVp
B) mA
C) Seconds
D) None of the above

Question 20

When imaging the thoracic spine, in order to take advantage of the anode heel effect, the most superior portion of the patient's spine should be placed beneath:

A) the anode end of the tube.
B) the cathode end of the tube.
C) the middle of the tube.
D) either end; it doesn't matter when imaging the thoracic spine.

Question 21

What would be the appropriate change in mAs if the kVp were decreased by 15% and the density needed to be maintained?

A) Twice the mAs
B) Half the mAs
C) One fourth of the mAs
D) No change would be necessary.

Question 22

Reducing the area of exposure (increasing collimation) _____ image contrast.

A) increases
B) decreases
C) has no effect on

Question 23

Which of the following changes will result in increased density with no change in contrast?

A) Increased SID
B) Decreased SID
C) Increased collimation
D) Decreased collimation

Question 24

Which of the following is a destructive pathology?

A) Pneumonia
B) Edema
C) Pleural effusion
D) Emphysema

Question 25

If barium sulfate is selected as the contrast media, it is necessary to:

A) increase kVp.
B) increase mAs.
C) decrease the grid ratio.
D) decrease the time.

Question 26

With all other factors remaining the same, a patient with which body habitus would require the highest exposure factors?

A) Asthenic
B) Sthenic
C) Hypersthenic
D) Hyposthenic

Question 27

Which one of the following immobilizing devices requires an increase in the exposure technique?

A) Fiberglass cast
B) Plaster cast
C) Air splint
D) b and c

Question 28

An abdomen image is done using 66 kVp and 40 mAs. Image density is appropriate but the image has too high (short scale) contrast. Which of these exposure factors would be the best change to make?

A) 56 kVp and 60 mAs
B) 66 kVp and 20 mAs
C) 76 kVp and 40 mAs
D) 76 kVp and 20 mAs

Question 29

Assuming all produce appropriate density images, which of the following would be the best exposure technique choice when performing a chest radiograph on an infant?

A) Use 40 ms exposure time.
B) Use 60 ms exposure time.
C) Use 200 ms exposure time.
D) Use at least 80 kVp.

Question 30

Generally speaking, what do additive pathologic conditions require?

A) Increased focal spot size
B) Increased mA
C) Increased kVp
D) Increased SID

Question 31

Assuming all exposure factors remain unchanged, what is the result of changing to an image receptor with a higher relative speed?

A) Density increases.
B) Density decreases.
C) Patient dose increases.
D) b and c

Question 32

In order to reduce patient exposure, a _____ kVp and _____ mAs should be used when possible.

A) lower, higher
B) higher, higher
C) higher, lower
D) it makes no difference

Question 33

A 3-year-old comes in for a hand radiograph. If the fixed kVp technique chart recommends 4 mAs for an average adult hand, how much mAs would the 3-year-old require?

A) 1 mAs
B) 3 mAs
C) 5 mAs
D) 16 mAs

Question 34

When a radiograph needs to be repeated because it is too dark, the minimum change in mAs needed is:

A) reduce the mAs by 30%.
B) reduce the mAs by 50%.
C) increase the mAs by 30%.
D) increase the mAs by a factor of 2.

Question 35

Generally speaking, what is the kVp value for a pediatric (less than 6 years old) skull compared with the adult skull?

A) 5% less
B) 15% less
C) 50% less
D) 50% more