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Radiographic Imaging > Chapter 12 > Flashcards

Chapter 12 Flashcards

1
Q

The factors that affect x-ray emission under the direct control of the radiographer are called the ____ factors.
a. quality
b. quantity
c. prime
d. principal

A

prime

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2
Q

The prime factors include all of the following EXCEPT
a. filtration.
b. mAs.
c. kVp.
d. distance.

A

filtration

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3
Q

Milliamperage-second (mAs) directly affects all of the following EXCEPT
a. beam quantity.
b. beam intensity.
c. beam quality.
d. x-ray output.

A

beam quality

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4
Q

The factors that directly affect x-ray quantity are
a. mA.
b. time (S).
c. filtration.
d. both a and b.

A

both a and b

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5
Q

Total x-ray beam quality is numerically represented by the
a. kEv.
b. SOD.
c. mAs.
d. HVL.

A

HVL

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6
Q

The factors that directly affect x-ray quality are
a. kVp and beam filtration.
b. mAs and distance.
c. filtration and mAs.
d. focal spot size and anode angle.

A

kVp and beam filtration

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7
Q

Using digital detector technology, the term used to express exposure to the detector is
a. mR/mAs
b. exposure index(EI)
c. QDE
d. IRE

A

exposure index (EI)

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8
Q

Select the TRUE statement regarding digital imaging, from the choices below.
a. Digital detectors will compensate for errors in mAs selection
b. Exposure index numbers are consistent between manufacturers
c. The brightness on a review monitor is not related to x-ray exposure
d. Digital technology has eliminated repeat images due to errors in exposure selection

A

The brightness on a review monitor is not related to x-ray exposure

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9
Q

As the mA doubles, the number of electrons flowing from cathode to anode
a. increases fourfold.
b. increases twofold.
c. decreases twofold.
d. increases by 50 percent.

A

increased twofold

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10
Q

The product of tube current and exposure time is equal to
a. kVp.
b. x-ray beam quality.
c. x-ray beam quantity.
d. the HVL.

A

x-ray beam quantity

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11
Q

The primary factor controlling x-ray beam quantity is determined by
a. mAs.
b. kVp.
c. distance.
d. filtration.

A

mAs

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12
Q

In order to increase image receptor (IR) exposure by 40 percent, the radiographer would
a. change the mAs from 15 to 21 mAs.
b. decrease the kVp by 40 percent.
c. increase the mAs by 20 percent.
d. decrease the distance by 40 percent.

A

change the mAs from 15 to 21 mAs

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13
Q

In order to increase image receptor (IR) exposure by 40 percent, the radiographer would
a. change the mAs from 15 to 21 mAs.
b. decrease the kVp by 40 percent.
c. increase the mAs by 20 percent.
d. decrease the distance by 40 percent.

A

change the mAs from 15 to 21 mAs

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14
Q

If the mAs of a radiograph is increased from 10 to 20, the result will be
a. an increase in the EI number from 125 to 250.
b. no change in the EI number.
c. an increase in the EI number from 125 to 135.
d. a decrease in patient exposure.

A

an increase in the EI number from 125 to 250

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15
Q

The relationship between mAs and exposure is
a. exponential.
b. directly proportional.
c. indirectly proportional.
d. a squared relationship.

A

directly proportional

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16
Q

Exposure indicators used in digital imaging have a direct or indirect relationship with exposure, depending upon the manufacturer. If the digital system you are using has an indirect relationship with exposure, your exposure reference value (S#) will
a. increase with increased exposure.
b. decrease with increased exposure.
c. be unaffected by changes in mAs.
d. will not change with an increase in kVp.

A

decrease with increased exposure

17
Q

Increasing the kVp for an exposure will
a. create a decrease in the number of electrons traveling from cathode to anode.
b. decrease the speed of electrons going from cathode to anode.
c. create an increase in the number of electrons traveling from cathode to anode.
d. cause the electrons to travel faster from cathode to anode.

A

cause the electrons to travel faster from cathode to anode

18
Q

Increasing the energy of an incident electron will result in the production of an x-ray photon with
a. greater energy.
b. less energy.
c. greater charge.
d. greater velocity.

A

greater energy

19
Q

If kVp is doubled, the amount of x-ray photons created approximately increases
a. twofold.
b. threefold.
c. fourfold.
d. eightfold.

A

fourfold

20
Q

Kilovoltage is the primary controlling factor of
a. x-ray beam quantity.
b. filtration thickness.
c. x-ray beam quality.
d. x-ray beam intensity.

A

x-ray beam quality

21
Q

An increase in kVp by 15 percent will cause an approximate ____ in the exposure to the receptor.
a. 15 percent increase
b. tripling
c. doubling
d. quadrupling

A

doubling

22
Q

Adjustments in mAs should be used to control IR
a. resolution.
b. contrast.
c. exposure.
d. window level.

A

exposure

23
Q

X-ray beam penetrability is primarily controlled by
a. mAs.
b. focal spot size and dimension.
c. kVp.
d. filtration.

A

kVp

24
Q

The relationship between the intensity of radiation and distance is the
a. reciprocity law.
b. inverse square law.
c. direct square law.
d. 15 percent rule.

A

inverse square law

25
Q

When using a digital image receptor (IR)
a. changes in kVp are preferred to control exposure
b. control IR exposure with predictable changes in mAs
c. the 15% rule does not apply
d. the inverse square law does not apply

A

control IR exposure with predictable changes in mAs

26
Q

All factors remaining constant, which of the following set of exposure conditions would yield the GREATEST image receptor exposure?
a. 100 mA, .75 sec, 40” SID
b. 300 mA, .25 sec, 44” SID
c. 600 mA, 125 ms, 40” SID
d. 400 mA, 200 ms, 40” SID

A

400 mA, 200 ms, 40 SID

27
Q

All factors remaining constant, which of the following set of exposure conditions would yield an image with the HIGHEST image receptor (IR) exposure?
a. 100 mA, .75 sec, 40” SID, 70 kVp
b. 150 mA, .25 sec, 44” SID, 80 kVp
c. 300 mA, 125 ms, 40” SID, 70 kVp
d. 400 mA, 187 ms, 56” SID, 88 kVp

A

400 mA, 187 ms, 56’ SID, 88 kVp

28
Q

After completing an upright abdomen radiograph using A.E.C., you notice some degree of motion artifact on the final image. To improve the repeat image results, your best option would be to
a. decrease the kVp.
b. increase your distance.
c. double the mA and decrease the kVp by 15 percent.
d. increase the kVp by 15 percent with mAs compensation.

A

increase the kVp by 15 percent with mAs compensation

29
Q

Which of the following sets of exposure factors would best control involuntary motion?
a. 100 mA, 0.09 sec
b. 300 mA, 30 ms
c. 500 mA, 18 ms
d. 200 mA, 0.045 sec

A

500 mA, 18 ms

30
Q

The length of the exposure time (S) for a radiograph, is used to primarily control
a. image contrast.
b. motion distortion.
c. radiographic image density.
d. patient dose.

A

motion distortion

31
Q

You have taken a digital radiograph that yields an EI# of 75. The recommended target EI# for this projection is 125. When you repeat the image, you will achieve the desired results by
a. decreasing the mAs from 12 mAs to 9 mAs
b. increasing the mAs from 15 mAs to 25 mAs
c. increasing your SID from 40” to 44”
d. increasing you kVp from 85 kVp to 98 kVp with no mAs compensation

A

increasing the mAs from 15 mAs to 25 mAs

Radiographic Imaging (18 decks)

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