Deck 6: Exposure Technique Factors

Question 1

With film-screen imaging,when mAs is increased,density is _____________; when mAs is decreased,density is _____________.

A) increased; increased
B) increased; decreased
C) decreased; decreased
D) decreased; increased

Answer 1

increased; decreased

Question 2

With film-screen imaging,which of the following technique factors directly controls the density produced on the image?

A) mAs
B) kVp
C) SID
D) Central ray angle

Answer 2

mAs

Question 3

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%

Answer 3

30%

Question 4

As mAs increases,the quantity of radiation reaching the IR ____________________.

A) increases
B) decreases
C) is not affected

Question 5

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 6

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 7

What effect does the level of mAs have on image brightness when using digital image receptors?

A) Increases image brightness.
B) Decreases image brightness.
C) Does not directly affect image brightness.

Question 8

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 9

If you were to select 250 mA and 0.5 s on the control panel,how much mAs would be created?

A) 62.5 mAs
B) 250 mAs
C) 125 mAs
D) 500 mAs

Question 10

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 11

Increasing the kVp will _________ the IR exposure and density produced on the film image.

A) increase
B) decrease
C) not affect

Question 12

The product of milliamperage and exposure time is ______________________ to the quantity of x-rays produced

A) directly proportional
B) inversely proportional
C) not related

Question 13

When a film image is too light,it has _________ density,and would require a(n)_______ in mAs by 2 on repeat to obtain a diagnostic image.

A) insufficient; increase
B) insufficient; decrease
C) excessive; decrease
D) excessive; increase

Question 14

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

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

Question 15

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 16

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

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

Question 17

The numerical value that is displayed on the processed image to indicate the level of x-ray exposure received on the digital image receptor is the_______________.

A) image brightness
B) exposure indicator
C) accession number
D) optical density

Question 18

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

A) kVp
B) mA
C) Seconds
D) SID

Question 19

Increased quantum noise is seen in a digital image with:

A) severely lower-than-needed mAs.
B) a little lower-than-needed mAs.
C) a little higher-than-needed mAs.
D) severely higher-than-needed mAs.

Question 20

Which of the following technical factors affects the exposure to the IR by altering the amount and penetrating ability of the x-ray beam?

A) kVp
B) mA
C) Seconds
D) SID

Question 21

If the first radiograph of a chest is done using 72 in and 12 mAs,and a second radiograph is done using 40 in,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 22

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 23

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 24

The misrepresentation of the size of an object is:

A) shape distortion.
B) magnification.
C) foreshortening.
D) elongation.

Question 25

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 26

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

Question 27

The distance between the object being radiographed and the IR is the:

A) magnification factor.
B) SID.
C) OID.
D) SOD.

Question 28

If the first radiograph of a foot is done using 4 mAs at 40 in,and a second radiograph is done using 50 in,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 29

What effect will increasing SID have on recorded detail?

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

Question 30

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

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

Question 31

The relationship between distance and x-ray beam intensity,specifically that the intensity of the x-ray beam is inversely proportional to the square of the distance from the source,is the:

A) direct square law.
B) Gurney-Mott theory.
C) inverse square law.
D) magnification law.

Question 32

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 33

Magnification is affected by:

A) focal spot size.
B) OID.
C) SID.
D) B and C.

Question 34

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 35

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 36

A high kVp results in:

A) less absorption and more transmission in anatomic tissues.
B) less variation in the x-ray intensities exiting the patient.
C) increase interactions from Compton scattering.
D) low-contrast image.
E) all of the above.

Question 37

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 38

The distance between the radiation source and the image receptor is the:

A) magnification factor.
B) SID.
C) OID.
D) SOD.

Question 39

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 40

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 41

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 42

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

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

Question 43

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 44

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

Question 45

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 46

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 47

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 48

Changes in kVp do not affect the digital exposure indicator.

Question 49

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 50

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 51

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 52

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

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

Question 53

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

A) 200 mA at 0.06 s
B) 400 mA at 0.03 s
C) 600 mA at 20 ms
D) 800 mA at 0.15 s

Question 54

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 55

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 56

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 57

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

Question 58

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

Question 59

For film-screen imaging,density is controlled by:

A) mA.
B) exposure time.
C) mAs.
D) all of the above.

Question 60

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 61

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

Question 62

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 63

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

Question 64

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

Question 65

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 66

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

Question 67

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