Deck 11: The Prime Factors

Question 1

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.

Answer 1

cause the electrons to travel faster from cathode to anode.

Question 2

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

Answer 2

prime

Question 3

If 1 coulomb is equal to 6.3 *10¹⁸ electron charges, how many electrons flow from cathode to anode in 1 second?

A)6.3 * 10¹⁸
B)6.3 * 10⁸
C)6.3 * 10⁴
D)6,300

Answer 3

6.3 * 10¹⁸

Question 4

If the mAs of a radiograph is increased from 10 to 20, the resulting radiograph will exhibit

A)decreased radiographic film density.
B)decreased radiographic contrast.
C)increased radiographic film density.
D)increased radiographic contrast.

Question 5

The prime factors include all of the following EXCEPT

A)filtration.
B)mAs.
C)kVp.
D)distance.

Question 6

The factors that directly affect x-ray quantity are

A)mA.
B)time (S).
C)filtration.
D)both a and b

Question 7

X-ray beam quality is numerically represented by the

A)OID.
B)SOD.
C)mAs.
D)HVL.

Question 8

The primary factor controlling x-ray beam quantity is determined by

A)mAs.
B)kVp.
C)distance.
D)filtration.

Question 9

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.

Question 10

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.

Question 11

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%.

Question 12

An increase in kVp by 15 percent will cause an approximate ____ in the exposure.

A)15 percent increase
B)tripling
C)doubling
D)quadrupling

Question 13

If 1 ampere equals a flow of 6.3 * 10¹⁸ electrons per second, how many electrons flow from cathode to anode in 1 milliampere?

A)6.3 * 10²¹
B)6.3 * 10¹⁸
C)6.3 * 10¹⁵
D)6.3 * 10¹⁶

Question 14

The reaction of a photographic film to light is equal to the product of the intensity of the light and the duration of the light exposure.This concept is known as

A)the reciprocity law.
B)the inverse square law.
C)Coulomb's law.
D)the 15 percent rule.

Question 15

In order to increase radiographic film density by 40%, the radiographer would

A)change the mAs from 15 to 21 mAs.
B)decrease the kVp by 40%.
C)increase the mAs by 20%.
D)decrease the distance by 40%.

Question 16

Milliamperage-second (mAs) directly affects all of the following EXCEPT

A)beam quantity.
B)beam intensity.
C)beam quality.
D)x-ray output.

Question 17

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.

Question 18

Kilovoltage is the primary controlling factor of

A)radiographic film density.
B)radiographic film contrast.
C)beam quantity.
D)none of the above

Question 19

The relationship between mAs and exposure is

A)exponential.
B)directly proportional.
C)indirectly proportional.
D)a squared relationship.

Question 20

If kVp is doubled, the amount of x-ray photons created approximately increases

A)twofold.
B)threefold.
C)fourfold.
D)eightfold.

Question 21

All factors remaining constant, which of the following set of exposure conditions would yield an image with the GREATEST radiographic film density?

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

Question 22

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.

Question 23

The length of the exposure time (S) for a radiograph, is used to primarily control

A)image contrast.
B)motion.
C)radiographic image density.
D)patient dose.

Question 24

Given 50 mA and an exposure time of 0.50 second, calculate the mAs.

Question 25

Given an exposure time of 0.15 second and a milliamperage of 100, calculate the mAs.

Question 26

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%.
D)increase the kVp by 15%.

Question 27

Given 40 mA and an exposure time of 0.20 second, calculate the mAs.

Question 28

A radiograph is produced using 20 mAs at 65 kVp.To double the exposure, what kVp should be used?

Question 29

Given 25 mAs and a milliamperage of 100, calculate the exposure time.

Question 30

A radiograph is taken at 400 mA, 55 ms, 95 kVp.A second image could be taken to improve contrast at

A)400 mA, 0.110 sec, 80 kVp.
B)400 mA, 0.055 sec, 110 kVp.
C)500 mA, 4 ms, 95 kVp.
D)600 mA, 0.083 sec, 92 kVp.

Question 31

All factors remaining constant, which of the following set of exposure conditions would yield an image with the GREATEST radiographic film density?

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

Question 32

Given an exposure time of 0.06 second and a milliamperage of 400, calculate the mAs.

Question 33

A radiograph is produced using 25 mAs at 80 kVp.To cut the exposure in half, how much should the kVp be increased?

Question 34

An x-ray exposure of 200 mR is recorded at a distance of 40 inches.If the same technical factors are used, what will the exposure be if the distance is increased to 72 inches?

Question 35

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

Question 36

X-ray beam penetrability is primarily controlled by

A)mAs.
B)focal spot size and dimension.
C)kVp.
D)filtration.

Question 37

Adjustments in kVp should be used to control radiographic

A)density.
B)detail.
C)contrast.
D)distance.

Question 38

The density maintenance formula is a

A)reciprocity law.
B)inverse square law.
C)direct square law.
D)15 percent rule.

Question 39

A radiographer takes an initial radiograph using the technical factors of 50 mA at 0.46 sec.There is involuntary motion on the radiograph, but the radiographer wants to maintain radiographic film density.If the exposure time is reduced to 0.115 sec, what is the new mA?

Question 40

Given 5 mAs and a milliamperage of 200, calculate the exposure time.

Question 41

An exposure was made using 200 mA, 0.05 second exposure and 75 kVp.
Suggest three options you could use to double the radiographic image density.

Question 42

An x-ray exposure of 100 mR is recorded at a distance of 40 inches.To reduce the exposure to 25 mR, to what will the distance need to be changed?

Question 43

An acceptable radiograph was taken using 12 mAs at 80 kVp at a distance of 72 inches.To reduce the image density by 50%, the new distance should be what?

Question 44

An acceptable radiograph was taken using 20 mAs at 70 kVp at a distance of 40 inches.A second radiograph is requested at 72 inches.What mAs should be used to produce this radiograph with a 72-inch distance?

Question 45

An acceptable radiograph was taken using 40 mAs at 80 kVp at a distance of 60 inches.A second radiograph is requested at 40 inches.What mAs should be used to produce this radiograph with a 40-inch distance?