112 EXAM 3

Question 1

Adjustments in mAs should be used to control IR

Answer 1

exposure.

Question 2

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

Answer 2

400 mA, 200 ms, 40” SID

Question 3

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

Answer 3

400 mA, 187 ms, 56” SID, 88 kVp

Question 4

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

Answer 4

doubling

Question 5

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.

Answer 5

increases twofold

Question 6

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

Answer 6

fourfold.

Question 7

If the mAs of a radiograph is increased from 10 to 20, the result will be

Answer 7

a decrease in patient exposure.

Question 8

In order to increase image receptor (IR) exposure by 40 percent, the radiographer would

Answer 8

change the mAs from 15 to 21 mAs.

Question 9

Increasing the energy of an incident electron will result in the production of an x-ray photon with

Answer 9

greater energy.

Question 10

Kilovoltage is the primary controlling factor of

Answer 10

x-ray beam quality.

Question 11

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

Answer 11

beam quality.

Question 12

The factors that affect x-ray emission under the direct control of the radiographer are called the ____ factors.

Answer 12

prime

Question 13

The factors that directly affect x-ray quality are

Answer 13

kVp and beam filtration.

Question 14

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

Answer 14

motion distortion.

Question 15

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

Answer 15

mAs.

Question 16

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

Answer 16

filtration

Question 17

The product of tube current and exposure time is equal to

Answer 17

x-ray beam quantity.

Question 18

The relationship between mAs and exposure is

Answer 18

directly proportional

Question 19

The relationship between the intensity of radiation and distance is the

Answer 19

inverse square law

Question 20

Total x-ray beam quality is numerically represented by the

Answer 20

HVL.

Question 21

Which of the following sets of exposure factors would best control involuntary motion?

Answer 21

500 mA, 18 ms

Question 22

X-ray beam penetrability is primarily controlled by

Answer 22

kVp.

Question 23

A compensating wedge filter would be appropriate for

Answer 23

AP foot radiography.

Question 24

A Thoraeus filter combines all of the following materials EXCEPT
a. silver.
b. copper.
c. tin.
d. aluminum.

Answer 24

silver.

Question 25

All filtration can be expressed in terms of the thickness of _________ equivalency.

Answer 25

aluminum.

Question 26

All of the following are true of K-edge filters EXCEPT a. They are also called compound filters. b. Copper and aluminum are the materials of choice. c. They rely on photoelectric interactions and the production of characteristic radiation. d. The x-ray beam traverses aluminum first, followed by the copper layer.

Answer 26

The x-ray beam traverses aluminum first, followed by the copper layer.

Question 27

Beam filtration does what to patient dose?

Answer 27

It decreases patient dose.

Question 28

Filtration is the process of eliminating undesirable ____ by the insertion of absorbing materials into the primary beam.

Answer 28

low-energy x-ray photons

Question 29

Filtration permits the radiographer to ____ the photon emission spectrum into a more useful beam.

Answer 29

narrow

Question 30

For an x-ray beam operated at 80 kVp,

Answer 30

the beam is harder than a 60 kVp beam.

Question 31

For an x-ray beam operated at 90 kVp, the required minimum filtration must be

Answer 31

1.0 mm Al/Eq inherent plus 1.5 mm Al/Eq added.

Question 32

How many half-value layers must be added to the primary beam to reduce its intensity to less than 20 percent of its original value?

Answer 32

3

Question 33

If the half-value layer of diagnostic radiographic equipment is too low, it may be corrected by

Answer 33

increasing the primary beam filtration.

Question 34

In general, low-energy x-ray photons

Answer 34

are absorbed by the patient.

Question 35

In mammography tubes, the glass window of the tube is replaced with __________ to reduce patient skin exposure.

Answer 35

beryllium

Question 36

Most of the inherent filtration of a typical x-ray equipment comes from the

Answer 36

window of the glass envelope

Question 37

The amount of material that will reduce the intensity of the primary beam to one-half its original value is termed the

Answer 37

half-value layer.

Question 38

The build-up of tungsten deposits on the inside of an aged x-ray tube adds to the

Answer 38

inherent filtration

Question 39

The collimator device is considered part of the ____ filtration.

Answer 39

added

Question 40

The half-value layer is typically expressed in

Answer 40

Al/Eq.

Question 41

The most common diagnostic x-ray beam filter material is

Answer 41

aluminum.

Question 42

The problem of uneven image receptor exposure due the heel effect is solved by a

Answer 42

compensation filter.

Question 43

Total beam filtration is equal to the sum of ____ filtration.

Answer 43

inherent and added

Question 44

What term describes filtration that is part of the x-ray tube, the tube housing, and the collimation device?

Answer 44

inherent

Question 45

When comparing two x-ray beams, one at 60 kVp and another at 85 kVp, a. adding aluminum to the 60 kVp beam greatly reduces the skin dose to the patient. b. the 85 kVp beam will offer a lower entrance skin exposure. c. adding 0.5 mm of aluminum to the 85 kVp beam will require no additional mAs in order to maintain beam intensity.

Answer 45

all of them

Question 46

When looking to purchase an x-ray tube, output of tubes can be measured by looking at the tube’s published

Answer 46

HVL

Question 47

Which of the following are considered filter media as the beam traverses toward the patient?

Answer 47

a. glass b. dielectric oil c. aluminum

Question 48

Which of the following filtrations would result in the lowest entrance skin exposure to the patient?

Answer 48

1.0 Al/Eq

Question 49

Which of the following is affected by half-layer value?

Answer 49

patient skin exposure

Question 50

Which one of the following compensating filters is used most commonly in the radiography of femur?

Answer 50

wedge