Chapter 7 Quiz

Question 1

Which of the following is not one of the five basic xray interactions with matter?

a.) bremsstrahlung
b.) classical scattering
c.) compton scattering
d.) photoelectric effect

Answer 1

a.) bremmsstrahlung

Question 2

Compton interaction effects the image by increasing which of the following?

a.) contrast resolution
b.) latitude
c.) scatter (fog)
d.) spatial resolution

Answer 2

c.) scatter (fog)

Question 3

The compton effect is:

a.) also called classical scattering
b.) the principle source of image noise (fog)
c.) the same as Rayleigh scattering
d.) the same as thompson effect

Answer 3

b.) the principle source of image noise (fog)

Question 4

The radiographic image is formed principally by which of the following?

a.) classical scattering
b.) compton scattering
c.) off focus radiation
d.) photoelectric interactions
e.) uniform distribution of remnant xrays

Answer 4

d.) photoelectric interactions

Question 5

Which of the following is a major source of occupational exposure?

a.) pair production
b.) classical interactions
c.) compton interactions
d.) thomson interactions

Answer 5

c.) compton interactions

Question 6

Which of the following events will not occur in the diagnostic range of xray energies?

a.) compton
b.) classical
c.) photoelectric
d.) photodisintegration

Answer 6

d.) photodisintegration

Question 7

Which of the following tissue interactions is a major source or patient exposure?

a.) classical
b.) compton
c.) photoelectric
d.) coherent

Answer 7

c.) photoelectric

Question 8

Contrast is considered a radiopaque material. T/F

Answer 8

True

Question 9

A reduction in the number of photons or energy in the xray beam after it interacts with tissue defines what?

a.) absorption
b.) attenuation
c.) differential attenuation
d.) transmission

Answer 9

b.) attenuation

Question 10

A thompson tissue interaction will have what effect on patient dose?

a.) no effect
b.) signifigantly increases
c.) decreases
d.) slightly increases

Answer 10

d.) slightly increases

Question 11

Photoelectric interactions:

a.) contribute significantly to patient dose
b.) should be reduced to as near zero as possible
c.) negatively effect IR exposure
d.) all of the above

Answer 11

a.) contribute significantly to patient dose

Question 12

The difference between the xray photons that are absorbed photoelectrically and photons that exit the body is the defintion for:

a.) attenuation
b.) absorption
c.) differential absorption
d.) transmission
e.) scatter

Answer 12

c.) differential absorption

Question 13

Choose all of the following statements that are accurate pertaining to the role of KVP in radiographic image prodution.

a.) as kvp increased, penetrating ability of the xrays increases
b.) as kvp is increased, mroe xrays exit the patient to strike the IR
c.) as kvp is decreased wavelength decreases
d.) as kvp increased, receptor exposure increases
e.) as kvp decreases IR exposure remains constant

Answer 13

a, b and d only

Question 14

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

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

Answer 14

d.) xray quantity

Question 15

____________ interact with tungsten atoms and create a brems or characteristic xray.

a.) electrons
b.) photons
c.) electrons and photons
d.) characteristic electrons

Answer 15

a.) electrons

Question 16

Xrays can eject electrons from atoms. this is known as:

a.) ionization
b.) photoelectric
c.) compton
d.) absorption

Answer 16

a.) ionization

Question 17

Which of the following has the greatest mass density:

a.) blood
b.) bone
c.) fat
d.) lung
e.) muscle

Answer 17

b.) bone

Question 18

_________ atomic thickness will decrease attenuation.

a.) increased
b.) decreased

Answer 18

b.) decreased

Question 19

___________ atomic number will decrease transmission

a.) increase
b.) decrease

Answer 19

a.) increase

Question 20

____________ tissue density will increase transmissiono

a.) increase
b.) decrease

Answer 20

b.) decrease

Question 21

__________ part thichness will decrease image receptor exposure.

a.) increase
b.) decrease

Answer 21

a.) increase

Question 22

Attenuated xray beam that leaves the patient and contains both scatter and transmitted radiation describes which of the following?

a.) attenuation
b.) exit radiation
c.) scatter
d.) differential absorption

Answer 22

b.) exit radiation

Question 23

Factors that decrease xray absorption include:

a.) increase tissue density
b.) increased xray beam quality
c.) increased tissue thickness
d.) increased atomic number

Answer 23

b.) increase xray beam quality

Question 24

Which of the following is not a contributor to xray beam quality

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

Answer 24

b.) mas

Question 25

Decreased patient thickness will:

a.) increase attenuation
b.) increase transmission
c.) decrease transmission
d.) increase absorption

Answer 25

b.) increase transmission

Question 26

If xray beam transmission has increased then likely:

a.) attenuation has increased
b.) the part has a high z number
c.) Ir exposure increased
d.) IR exposure decreased

Answer 26

c.) IR exposure increased

Question 27

Which of the followign will increase beam attenuation?

a.) higher kvp
b.) decreased tissue density
c.) thicker atomic part
d.) lower atomic numebr

Answer 27

c.) thicker atomic part