Chapter 6 Test

Question 1

The inverse square law relates intensity (of light/xrays)) to

a.) mass
b.) time
c.) distance
d.) velocity

Answer 1

c.) distance

Question 2

Which of the following is NOT a contributor to xray beam quality?

a.) kvp
b.) mas
c.) filtration
d.) penetrability

Answer 2

b.) mas

Question 3

An increase in total filtration of the xray beam will decrease

a.) IR exposure
b.) beam HVL
c.) the average energy of the xray beam
d.) image quality
e.) IR exposure

Answer 3

e.) IR exposure

Question 4

A decrease in kvp will result in which of the following:

1.) a decrease in photon energy
2.) an increase in average filtration
3.) a decrease in receptor exposure
4.) an increase in beam penetrabilty
5.) a 15 percent increase in mas

a.) 1, 2, and 3
b.) 2 and 3
c.) 1, 2, 3, 4, and 5
d.) 1, 3 and 5
e.) 1 and 3

Answer 4

e.) 1 and 3

Question 5

What combination of factors results in the highest quality xray beam?

a.) 96 kvp, 50 mas, 2.5 mm AL
b.) 82 kvp, 25 mas, 3.5 mm AL
c.) 96 kvp, 15 mas, 3.5 mm AL

Answer 5

c.) 96 kvp, 15 mas, 3.5 mm AL

Question 6

Shorthand for atomic number is Z

a.) true
b.) fasle

Answer 6

a.) true

Question 7

The radiographer has no control over the penetrability of the xray beam

a.) true
b.) false

Answer 7

b.) fasle

Question 8

When xray tube filtration is increased, xray quality

a.) decreases
b.) increases
c.) filtration doesnt affect beam quality
d.) remains the same

Answer 8

b.) increases

Question 9

In a tungsten atom a brems interaction will occur when the incident electron _____________.

a.) strikes the nucleus
b.) strikes an outer shell electron
c.) interacts with the force field around the nucleus
d.) strikes an inner shell electron

Answer 9

c.) interacts with the force field around the nucleus

Question 10

How will xray photon intensity be affected if the source to image distance (SID) is doubled?

a.) its intensity increases two fold
b.) its intensity increases four fold
c.) its intensity decrease two fold
d.) its intensity decreases four fold

Answer 10

d.) its intensity decreases four fold

Question 11

When xray tube filtration is increases, xray quantity

a.) decreases
b.) increases
c.) remains the same
d.) filtration doesnt affect quantity

Answer 11

a.) decreases

Question 12

If kvp is doubled, beam quantity will:

a.) be cut in half
b.) double
c.) increase by a factor of 4
d.) increase by a factor of 2

Answer 12

c.) increase by a factor of 4

Question 13

The energy of a brems photon is dependent on which of the following variables?

a.) direct impact with the nucleus
b.) proximity of the incident electron to the nucleus
c.) binding energy of orbital electrons
d.) electron binding energy of the k shell

Answer 13

b.) proximity of the incident electron to the nucleus

Question 14

Brems photons are graphically represents by:

a.) quality emission spectrum
b.) continuous emission spectrum
c.) electromagnetic spectrum
d.) discrete emission spectrum

Answer 14

b.) continuous emission spectrum

Question 15

Added filtration affects the xray beam in what way?

a.) poorer beam quality
b.) higher beam quantity
c.) increased beam hardening
d.) higher patient dose

Answer 15

c.) increased beam hardening

Question 16

As the kvp increases (choose all that apply)

a.) beam quantity increases
b.) beam energy decreases
c.) beam peentrability increases
d.) beam quality remains the same while the quantityincreases

Answer 16

a.) beam quantity increases
c.) beam penetrability increases

Question 17

As mas increases, quality:

a.) decreases
b.) is unaffected
c.) increases
d.) increases by a factor of 4

Answer 17

b.) is unaffected

Question 18

Distance and xray beam quantity or intensity share what kind of relationship?

a.) inverse
b.) direct

Answer 18

a.) inverse

Question 19

When distance is increased, xray quantity at that distance:

a.) decreases in proportion to the distance squared
b.) decreases proportionately
c.) remains the same
d.) increases proportional to the distance squared

Answer 19

a.) decreases in proportion to the distance squared

Question 20

Which of the following effect xray beam quantity? choose all that apply

a.) kvp
b.) intensity
c.) total number of photons
d.) radiation dose

Answer 20

a.) kvp
b.) intensity
c.) total number of photons
d.) radiation dose

Question 21

To maintain density in an image what percentage increase in kvp should be accompanied by a reduction of one half mas?

a.) 15 percent
b.) 10 percent
c.) 5 percent
d.) 50 percent

Answer 21

a.) 15 percent

Question 22

Characteristic photon energy is equal to:

a.) the binding energy of outer shell electron
b.) the sum of the original and final energy of the incident electrons
c.) the difference between electron shell energies
d.) the kvp set by the tech

Answer 22

c.) the difference between electron shell energies

Question 23

During an xray exposure an incident electron strikes the anode with an energy of 84 kev and passes very close to the nucleus what is the approxiamte energy of the beams photon?

a.) 69
b.) 1
c.) 16
d.) slightly less than 84

Answer 23

d.) slightly less than 84

Question 24

How does increasing the distance from the xray tube influence characterisitcs of the xray beam?

a.) increases quality
b.) increases quantity
c.) decreases quality
d.) decreases quantity

Answer 24

d.) decreases quantity

Question 25

The total number of xray photons in a beam is referred to as the:

a.) xray number
b.) xray quality
c.) xray quantity
d.) xray beam

Answer 25

c.) xray quantity

Question 26

What is the bidning energy of a k shell in a tungsten atom?

a.) 74 mas
b.) 69.5 kev
c.) 74 kev
d.) 32.5 kev

Answer 26

b.) 69.5 kev

Question 27

The __________ beam exits the collimator and exposes the patient while the _____________ beam exits the patient and strikes the IR.

a.) primary; remnant
b.) remnant; primary
c.) exit; remnant
d.) exit; primary

Answer 27

a.) primary; remnant

Question 28

Characteristics photons are graphically represented by the:

a.) discrete emission spectrim
b.) continous emission spectrum
c.) quality emission spectrum
d.) electromagnetic emission spectrum

Answer 28

a.) discrete emission spectrum

Question 29

The average energy of the xray beam is called;

a.) beam quanitty
b.) beam quality
c.) beam velocity
d.) beam intensity

Answer 29

b.) beam quality

Question 30

How does an increase from 70 to 100 kvp affect the energy of a k shell characteristics photon?

a.) decreases
b.) no change
c.) increases
d.) more info is required

Answer 30

b.) no change

Question 31

What is produced when an incident electron excites an outer shell electron?

a.) characteristic photon
b.) low energy characteristics electron
c.) heat
d.) brems photon

Answer 31

c.) heat

Question 32

Which of the following sets will produce the highest quality xray beam?

a.) 110 kvp and 26 mas
b.) 65 kvp and 12 mas
c.) 115 kvp and 3 mas
d.) 80 kvp and 60 mas

Answer 32

c.) 115 kvp and 3 mas

Question 33

to double the beam quality:

a.) increase the mas by a factor of 4
b.) double the mas
c.) leave the mas as is and reduce the kvp
d.) half the mas

Answer 33

b.) double the mas

Question 34

A wedge, trough or boomerang filter is also known as:

a.) a device to replace added filtration
b.) a compensating filter
c.) added filtration
d.) inherent filtration

Answer 34

b.) a compensating filter

Question 35

Aluminim filtration has its greatest effect on :

a.) low energy xray phtons
b.) low energy scattered photons
c.) high energy scattered phtons
d.) high energy xray phtons

Answer 35

a.) low energy xray photons

Question 36

How does an increase of 25 mas to 50 mas affect xray beam quality?

a.) it has no affect
b.) increases quality
c.) decreases quality
d.) it depends on the focal spot size

Answer 36

a.) it has no affect

Question 37

Another meaning of xray quantity is xray:

a.) intenisty
b.) penetrability
c.) filtration
d.) energy

Answer 37

a.) intensity

Question 38

Xray beam quantity refers to:

a.) velocity of phtons in a beam
b.) penetrating ability of the beam
c.) average energy of a beam
d.) the total number of phtons in a beam

Answer 38

d.) the total number of phtons in a beam

Question 39

What is the primary purpose of filtration?

a.) to decrease patient dose
b.) increase image quality
c.) decrease beam energy
d.) increase beam intensity

Answer 39

a.) to decrease patient dose

Question 40

Which of the following terms are related to xray beam quantity?

a.) HVL
b.) energy
c.) intenisty
d.) penetrability

Answer 40

c.) intenisty

Question 41

During an xray expousre an incident electron strikes the anode with an energy of 84 kev and passes very close to the tungsten nucleus what is the approximate energy of the incident electron as it exits the atoms?

a.) 1
b.) 110
c.) 69
d.) slightly less than 84

Answer 41

a.) 1

Question 42

Xray beam quality refers to:

a.) the number of photons in an xray beam
b.) the average energy of the xray beam
c.) the intensity of the xray beam
d.) the velocity of photons in an xray beam

Answer 42

b.) the average energy of the xray beam

Question 43

All of the following have an effect on patient dose except: choose all that apply

a.) inherent filtration
b.) milliamperage seconds
c.) compensating filters
d.) kilovoltage
e.) focal spot size

Answer 43

e.) focal spot size

Question 44

The electron stream which bombards the anode is called:

a.) effective focal spot
b.) actual focal spot

Answer 44

b.) actual focal spot

Question 45

The intensity of quantity of radiation diminishes with a decrease in distance

a.) true
b.) false

Answer 45

b.) false

Question 46

When the mas is increased, xray quantity

a.) increase as the square of the mas
b.) decreases as the square of the mas
c.) decreases proportionately
d.) increases proportionately

Answer 46

d.) increases proportionately

Question 47

if mas during an exam is increased by 50 percent

a.) patient exposure is increases by 50 percent
b.) kvp should be reduced by 4
c.) intenisty to the patient is increased 15 percent
d.) the scatter exposure to the operator is increased by 25 percent

Answer 47

a.) patient exposure is increased by 50 percentW

Question 48

Which of the following statements defines electron binding energy?

a.) the energy of repulsion between protons in the nucleus
b.) the the energy released through the process of ionization
c.) the energy required to remove an electron from orbit
d.) the energy of attraction between orbital electrons

Answer 48

c.) the energy required to remove an electron from orbit

Question 49

How does adding filtration to the xray tube assemnly change the characteristics of the xray beam?

a.) increase quantity, increase quality
b.) decreased quantity, increased quality
c.) decreased quantity, decreased quality
d.) increased quanitty, decreased quality

Answer 49

b.) decreased quanitity, increased quality

Question 50

The process of removing an electron from an atom is:

a.) atomization
b.) none of the above
c.) ionization
d.) annihilation

Answer 50

c.) ionization

Question 51

Which of the following terms is correctly used to describe xray beam quality?

a.) HVL
b.) ma
c.) intensity
d.) dose rate

Answer 51

a.) HVL

Question 52

Most diagnostic xray units will have a total aluminum equivalent of:

Answer 52

2.5mm

Question 53

Which of the following exposure factors controls the energy of the xray beam?

a.) exposure time
b.) kvp
c.) filtration
d.) mas

Answer 53

b.) kvp

Question 54

In brems xray production:

a.) the projectile electron is bound to tungsten
b.) the target electron is from the cathode
c.) the target electron is ionized
d.) the projectile electron is from the cathode

Answer 54

d.) the projectile electron is from the cathode

Question 55

Useful characteristics radiation is created within the xray tube when high energy electrons interact with:

a.) outer shell electrons
b.) electric field of the nucleus
c.) inner shell electrons
d.) nuclear force field of nucleus

Answer 55

c.) inner shell electrons

Question 56

The energy of characteristic photons will change when which of the following variable is modified?

a.) filtration thickness
b.)) tube current
c.) tube voltage
d.) anode material

Answer 56

d.) anode material

Question 57

Which interaction is responsible for producing the most xray photons at the xray tube target?

a.) brems
b.) characteristics
c.) photoelectric
d.) heat

Answer 57

a.) brems