Deck 26: Densityir Exposure

Question 1

The relationship between exposure and SID is

A)directly proportional.
B)inversely proportional.
C)directly proportional to the square of the distance.
D)inversely proportional to the square of the distance.

Answer 1

inversely proportional to the square of the distance.

Question 2

The density of the radiographic image in a film-based environment is the

A)easiest prime technical factor to evaluate.
B)result of black metallic silver deposited on a film
C)degree of overall blackening of the image.
D)all of the above

Answer 2

all of the above

Question 3

In the case of film radiography,

A)the response to exposure is linear.
B)the response to radiation exposure is inverse.
C)the response to exposure is logarithmic.
D)the response to exposure is exclusively a function of kVp.

Answer 3

the response to exposure is logarithmic.

Question 4

The minimum change necessary to cause a visible shift in density is ____ percent of mAs.

A)10-12
B)25-35
C)50-60
D)none of the above

Question 5

The effect of mAs upon IR exposure is

A)inverse.
B)inversely proportional.
C)directly proportional.
D)dependent upon kVp.

Question 6

In the event of making a single exposure that is critical to the exam success, most experienced technologists will

A)use slightly less mAs than necessary to prevent overexposure.
B)overexpose the IR slightly.
C)provide enough exposure to permit viewing with a bright light or adequate histogram analysis.
D)both b and c

Question 7

What conclusion can you reach regarding an image with an S# of 750 and good radiographic image density on the display monitor?

A)The image is likely to demonstrate noise or quantum mottle.
B)There was not enough exposure to create a good histogram.
C)The noise level will be at a minimum and the image will look good in the magnification mode.
D)The IR received too much exposure.

Question 8

The density maintenance formula mathematically resembles the

A)inverse square law.
B)15% rule.
C)law of reciprocity.
D)none of the above

Question 9

The 15% rule changes

A)density.
B)contrast.
C)distortion.
D)both a and b

Question 10

The principal controlling factor of radiographic image density is

A)kVp.
B)mAs.
C)time.
D)milliamperes.

Question 11

Which statement is FALSE?

A)As mAs increases, exposure increases.
B)As mAs decreases, density decreases.
C)As mAs increases, density increases.
D)As mAs decreases, exposure increases.

Question 12

A severely underexposed film image will

A)demonstrate adequate image detail but low contrast.
B)be unable to visualize recorded detail.
C)darken when placed on an illuminator.
D)demonstrate high radiographic density.

Question 13

Image brightness on an image display monitor is controlled by

A)window level.
B)window width.
C)EI number.
D)S number.

Question 14

Which factor influences the average energy of photons reaching the IR?

A)kVp
B)mAs
C)focal spot size
D)mA

Question 15

Which generator produces the least amount of radiographic density per mAs?

A)single-phase, 2-pulse
B)three-phase, 6-pulse
C)three-phase, 12-pulse
D)a high-frequency generator

Question 16

Which generator produces the greatest amount of radiographic density per mAs?

A)single-phase, 2-pulse
B)three-phase, 6-pulse
C)three-phase, 12-pulse
D)a high-frequency generator

Question 17

Which factor influences the number of photons reaching the IR?

A)kVp
B)mAs
C)focal spot selection
D)exposure time

Question 18

The optical density range visible to the human eye is

A)0.025 to 0.25.
B)0.25 to 2.50.
C)2.50 to 20.50.
D)20.50 to 200.50.

Question 19

The brightness of the image on a viewing monitor is

A)the result of radiographic density.
B)the result of the tissue density.
C)the result of the tissue thickness.
D)a function of the monitor.

Question 20

Which rule is used as a guide to maintain the same density when kVp changes?

A)doubling rule
B)15% rule
C)inverse square rule
D)density maintenance law

Question 21

As you analyze your image, you come to the conclusion that it must have more exposure.As a general rule, you should increase

A)kVp.
B)mAs by 2x.
C)the SID.
D)mAs by a 0.5 multiplier.

Question 22

The anode heel effect is more pronounced with

A)smaller field sizes (8"x10").
B)stationary anodes.
C)a 10 ^-degree target angle.
D)rotating anodes.

Question 23

Because of the "heel effect," x-ray beam intensity

A)is greater under the cathode side of the tube.
B)is greater under the anode side of the tube.
C)is equal across the beam long axis.
D)changes with patient position.

Question 24

Match the following items with the appropriate statement as each relates to image receptor exposure.
increasing kVp from 85 to 98 kVp

A)mAs
B)kVp
C)density maintenance formula
D)radiographic grids
E)15% rule
F)anode heel effect
G)focal spot size
H)recorded detail
I)EI value
J)visibility of detail

Question 25

All of the following will increase radiographic film density EXCEPT

A)increased developer temperature.
B)increased dryer temperature.
C)increased immersion time in developer.
D)increased developer concentration.

Question 26

Match the following items with the appropriate statement as each relates to image receptor exposure.
variation in beam intensity along the long axis of beam

A)mAs
B)kVp
C)density maintenance formula
D)radiographic grids
E)15% rule
F)anode heel effect
G)focal spot size
H)recorded detail
I)EI value
J)visibility of detail

Question 27

Focal spot blooming occurs with

A)high kVps.
B)high mAs.
C)large SIDs.
D)extreme tube angulation.

Question 28

Match the following items with the appropriate statement as each relates to image receptor exposure.
require an increase in mAs as ratio increases

A)mAs
B)kVp
C)density maintenance formula
D)radiographic grids
E)15% rule
F)anode heel effect
G)focal spot size
H)recorded detail
I)EI value
J)visibility of detail

Question 29

Optimum exposure to an IR is

A)1 mR plus or minus 33%.
B)10 mR plus or minus 33%.
C)1 mR plus or minus 3%.
D)10 mR plus or minus 15%.

Question 30

The greatest factor in the production of scatter radiation is

A)kVp.
B)mAs.
C)patient thickness.
D)patient position.

Question 31

Match the following items with the appropriate statement as each relates to image receptor exposure.
small and large

A)mAs
B)kVp
C)density maintenance formula
D)radiographic grids
E)15% rule
F)anode heel effect
G)focal spot size
H)recorded detail
I)EI value
J)visibility of detail

Question 32

Match the following items with the appropriate statement as each relates to image receptor exposure.
controls x-ray beam quantity

A)mAs
B)kVp
C)density maintenance formula
D)radiographic grids
E)15% rule
F)anode heel effect
G)focal spot size
H)recorded detail
I)EI value
J)visibility of detail

Question 33

A change in kVp, as an exposure factor, affects

A)average beam energy.
B)beam intensity.
C)the amount of scatter production.
D)all of the above

Question 34

When changing your SID from 72" to 56"

A)decrease your kVp by 15%.
B)decrease your mAs by 50%.
C)increase the mAs by a factor of 4.
D)all of the above

Question 35

If 60 kVp, 100 mA, and 0.25 sec.produce a satisfactory radiograph, what mAs was used?

Question 36

Match the following items with the appropriate statement as each relates to image receptor exposure.
controls the average energy of the x-ray beam

A)mAs
B)kVp
C)density maintenance formula
D)radiographic grids
E)15% rule
F)anode heel effect
G)focal spot size
H)recorded detail
I)EI value
J)visibility of detail

Question 37

Match the following items with the appropriate statement as each relates to image receptor exposure.
direct relationship between mAs and distance

A)mAs
B)kVp
C)density maintenance formula
D)radiographic grids
E)15% rule
F)anode heel effect
G)focal spot size
H)recorded detail
I)EI value
J)visibility of detail

Question 38

Radiographic room A is a three-phase, 6-pulse generator.Room B is a high frequency generator.When going between these two rooms to perform examinations, what exposure modification is necessary to produce comparable exposure density?

A)Use 15% more with the three-phase system.
B)Use 10% more with the high frequency system.
C)No change is required between the two systems.
D)Use 10% less with the high frequency system.

Question 39

Match the following items with the appropriate statement as each relates to image receptor exposure.
affected by photographic properties of image

A)mAs
B)kVp
C)density maintenance formula
D)radiographic grids
E)15% rule
F)anode heel effect
G)focal spot size
H)recorded detail
I)EI value
J)visibility of detail

Question 40

If 80 kVp, 400 mA, and 0.025 sec.produce a satisfactory radiograph, what mAs was used?

Question 41

If a satisfactory chest radiograph is obtained at 72 in.with a patient exposure of 10 R, what will the exposure be if the distance is reduced to 40 in.?

Question 42

If a radiograph using 30 mAs (400 mA at 0.075 sec.) produced a radiograph with satisfactory density, what new mA should be used at 0.20 sec.?

Question 43

A radiograph of the forearm is produced using 4 mA at 55 kVp.What kVp is required to halve the exposure?

Question 44

If a satisfactory density is obtained with 40 mAs at 72 in., what mAs is required to maintain the same density at 40 in.?

Question 45

If a satisfactory radiograph is obtained at 72 in.with a patient exposure of 4 R, what will the exposure be if the distance is reduced to 40 in.?

Question 46

If a radiograph using 50 mA (400 mA at 0.125 sec.) produced a radiograph with satisfactory density, what new mA should be used at 0.25 sec.?

Question 47

A radiograph of the forearm is produced using 4 mA at 55 kVp.What kVp would be required to double the exposure?

Question 48

If a satisfactory PA chest radiograph is obtained with 4 mAs at 72 in., what mAs is required to maintain the same density at 60 in.?

Question 49

If a radiograph using 40 mA (400 mA at 0.10 sec.) produced a radiograph with satisfactory density, what new time should be used at 200 mA?

Question 50

If a satisfactory density is obtained with 20 mAs at 40 in., what mAs is required to maintain the same density at 72 in.?