Deck 4: Exposure Technique Factors

Question 1

If a person stands 3 feet from the source of exposure, receives an exposure of 160 mR, and then moves to 6 feet from the source of exposure, what would be the new exposure according to the inverse square law?

A) 10 mR
B) 40 mR
C) 640 mR
D) 2560 mR

Answer 1

40 mR

Question 2

In film-screen imaging, reducing the area of exposure (increasing collimation)_____ image contrast.

A) Increases
B) Decreases
C) Has no effect on

Answer 2

Increases

Question 3

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.

Answer 3

Use 40 ms exposure time.

Question 4

With film-screen imaging, 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%

Question 5

With film-screen imaging, what would be the appropriate change in mAs if the kVp were decreased by 15% and the density needed to be maintained?

A) Double the mAs
B) Halve the mAs
C) Use one fourth of the mAs
D) No change would be necessary.

Question 6

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

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

Question 7

With film-screen imaging, which of the following technique factors will produce an image with 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 8

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 exposure to the IR when the grid is removed?

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

Question 9

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 exposure to the IR?

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

Question 10

If a person stands 12 feet from the source of exposure, receives an exposure of 60 mR, and then moves to 3 feet from the source of exposure, what would be the new exposure according to the inverse square law?

A) 15 mR
B) 45 mR
C) 240 mR
D) 960 mR

Question 11

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

Question 12

With film-screen imaging, which of the following technique factors will produce an image with the greatest density?

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

Question 13

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 exposure to the IR?

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

Question 14

If 20 mAs was used for all exposures, which kVp would produce the film-screen image with the greatest density?

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

Question 15

With film-screen imaging, an abdomen image is done using 60 kVp and 30 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) 51 kVp and 60 mAs
B) 51 kVp and 30 mAs
C) 69 kVp and 30 mAs
D) 69 kVp and 15 mAs

Question 16

With film-screen imaging, 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 17

With film-screen imaging, what is the primary controller of image contrast?

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

Question 18

When a film-screen image 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 two

Question 19

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

A) Lower, higher
B) Higher, higher
C) Higher, lower
D) It makes no difference.

Question 20

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 21

What effect will increasing SID have on recorded detail?

A) Increased recorded detail
B) Decreased recorded detail
C) No effect on recorded detail

Question 22

The misrepresentation of the size of an object is:

A) Shape distortion
B) Magnification
C) Foreshortening
D) Elongation

Question 23

Which of the following mA and exposure time combinations does not produce 12 mAs?

A) 200 mA @ 0.06 sec
B) 400 mA @ 0.03 sec
C) 600 mA @ 20 ms
D) 800 mA @ 0.15 sec

Question 24

If the image size measures 4.6 inches, and the magnification factor is 1.42, what is the size of the object?

A) 2.43 inches
B) 3.24 inches
C) 5.63 inches
D) 6.53 inches

Question 25

For film-screen imaging, density is controlled by:

A) mA
B) Exposure time
C) mAs
D) All of the above

Question 26

The digital imaging exposure indicator reflects the amount of radiation:

A) Leaving the tube
B) Entering the patient
C) Exiting the patient
D) Reaching the IR

Question 27

The SOD can be determined by:

A) Adding SID and OID
B) Adding the MF to the OID
C) Subtracting the OID from SID
D) Subtracting the SID from the MF

Question 28

With film-screen imaging, 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 29

Using a small focal spot size may be prohibited due to the:

A) Amount of heat produced by x-ray exposure
B) Amount of exposure time used
C) SID used
D) Speed of the film-screen system

Question 30

The property of the x-ray beam that impacts the unsharpness on the radiograph is beam:

A) Quality
B) Quantity
C) Divergence
D) Restriction

Question 31

Which of the following is a destructive pathology?

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

Question 32

Generally speaking, what do additive pathologic conditions require?

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

Question 33

When the SID is divided by the SOD, what is the result called?

A) Magnification factor
B) Degree of unsharpness
C) OID
D) Image width

Question 34

Magnification is affected by:

A) Focal spot size
B) OID
C) SID
D) B and C

Question 35

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 36

Shape distortion can be created by:

A) Off-centering the central ray
B) Angling the central ray
C) Increasing the SID
D) A and B only

Question 37

With film-screen imaging, increasing the kVp results in an image with ___________ density and ____________contrast.

A) Decreased; lower
B) Decreased; higher
C) Increased; lower
D) Increased; higher

Question 38

In order to image a structure that is located anteriorly in the body, it is best radiographed to minimize magnification by doing a(n)_____ projection.

A) Posterior-anterior
B) Anterior-posterior
C) Lateral
D) Oblique

Question 39

During selection of the focal spot size, the radiographer is really determining the:

A) Angle of the anode used
B) Actual size of the filament used
C) Energy of electrons available for tube current
D) Distance the electrons travel from cathode to anode

Question 40

Once the part has been penetrated, a doubling of the mAs results in ____________ the exposure to the IR.

A) One fourth
B) One half
C) Two times
D) Four times

Question 41

In order to see the effect of changing kVp, a greater change is needed when operating at low kVp as compared to high kVp.

Question 42

Kilovoltage does not affect the quantity of exit radiation until adequate penetration is reached.

Question 43

Knowing that 6 mAs is appropriate for a knee examination done at 40" SID, how much mAs should be used at 56" SID?

A) 1.5 mAs
B) 3 mAs
C) 12 mAs
D) 24 mAs

Question 44

With digital imaging, if lower than needed kVp is set, the image will have _______________ brightness and _________________ quantum mottle.

A) Very low; increased
B) Appropriate; increased
C) Excessive; decreased
D) Unacceptable; decreased

Question 45

The radiographic grid is located:

A) Inside the x-ray tube
B) Between the tube and patient
C) Between the patient and the IR
D) Beneath the IR

Question 46

Film-screen images should be produced with very high kVp and very low mAs in order to reduce patient exposure.

Question 47

When choosing a grid for an examination, the grid with the highest grid ratio should always be selected in order to most improve image contrast.

Question 48

With digital imaging, using twice as much mAs as needed will result in an image with _______________ brightness and _________________ patient exposure.

A) Appropriate; increased
B) Appropriate; appropriate
C) Excessive; increased
D) Excessive; appropriate

Question 49

Any increase in magnification results in a decrease in recorded detail.

Question 50

Which of the following is not affected by a change in SID?

A) Recorded detail
B) Image contrast
C) Amount of radiation reaching the IR
D) Magnification

Question 51

With film-screen imaging, for a given exposure technique, increasing part thickness decreases radiographic density.

Question 52

Which of the following contrast media do not require an adjustment in exposure factors?

A) Barium
B) Iodinated
C) Air
D) All require a change in exposure factors.

Question 53

As compared to a three-phase x-ray unit, a single phase unit requires higher exposure techniques to produce a comparable image.

Question 54

With digital imaging, the same mAs and kVp should be used for an AP lumbar spine and a lateral lumbar spine.

Question 55

The amount of mAs used has a direct effect on the density of a film-screen image.

Question 56

With film-screen imaging, decreasing collimation (using a larger field size)results in ____________image contrast and ____________ patient exposure.

A) Lower; higher
B) Lower; lower
C) Higher; higher
D) Higher; lower

Question 57

Changes in kVp do not affect the digital exposure indicator.

Question 58

As compared to a patient with a 24 cm thick abdomen, imaging a patient with a 20 cm thick abdomen will result in _____________ scatter being produced and ______________ image contrast.

A) Less; lower
B) More; lower
C) Less; higher
D) More; higher

Question 59

Increasing tube filtration results in an x-ray beam with __________________ quantity and ___________ energy.

A) Less; lower
B) Less; higher
C) More; lower
D) More; higher

Question 60

With digital imaging, exposure factors do not need to be adjusted in order to visualize soft tissue.