Question 1

Barium sulfate is used as a contrast agent to visualize soft tissue structures such as the stomach because it

Accepted Answer

A) is very heavy 
B) can be made very thick 
C) is inexpensive 
D) has a high atomic number 
A) is very heavy 
B) can be made very thick 
C) is inexpensive 
D) has a high atomic number

Question 2

Air is considered:

Accepted Answer

A) radiopaque 
B) hard to penetrate 
C) radiolucent 
D) more likely to absorb radiation 
A) radiopaque 
B) hard to penetrate 
C) radiolucent 
D) more likely to absorb radiation

Question 3

Pair production requires an x-ray photon with an energy of at least

Accepted Answer

A) 0.51 MeV 
B) 1.02 MeV 
C) 1.51 MeV 
D) 2.04 MeV 
A) 0.51 MeV 
B) 1.02 MeV 
C) 1.51 MeV 
D) 2.04 MeV

Question 4

The most radiosensitive molecule in the body is

Accepted Answer

A) DNA 
B) RNA 
C) nerve cells 
D) gonadal cells 
A) DNA 
B) RNA 
C) nerve cells 
D) gonadal cells

Question 5

The more the energy of the incident x-ray photon exceeds the binding energy of the inner-shell electron,the greater the probability of a photoelectric interaction.

Accepted Answer

A) True 
 B)False

Question 6

The probability of Compton scattering depends on the atomic number of the atom.

Accepted Answer

A) True 
 B)False

Question 7

Compton scattering typically occurs with

Accepted Answer

A) low-energy photons 
B) high-energy photons 
C) moderate-energy photons 
D) all of the above 
A) low-energy photons 
B) high-energy photons 
C) moderate-energy photons 
D) all of the above

Question 8

The Compton scatter photon

Accepted Answer

A) may exit the patient as part of the remnant radiation 
B) does not have enough energy to produce further interactions 
C) has enough energy to produce further interactions 
D) A and C 
E) A and B 
A) may exit the patient as part of the remnant radiation 
B) does not have enough energy to produce further interactions 
C) has enough energy to produce further interactions 
D) A and C 
E) A and B

Question 9

Without differential absorption,the image would be a single shade of gray.

Accepted Answer

A) True 
 B)False

Question 10

For photoelectric interactions to occur,the energy of the incident photon

Accepted Answer

A) may be greater than the binding energy of an inner-shell electron 
B) may be the same as the binding energy of an inner-shell electron 
C) may be less than the binding energy of an inner-shell electron 
D) A and B 
E) B and C 
A) may be greater than the binding energy of an inner-shell electron 
B) may be the same as the binding energy of an inner-shell electron 
C) may be less than the binding energy of an inner-shell electron 
D) A and B 
E) B and C

Question 11

Radiation interacting with air is more likely to be _____________,resulting in that area of the image being darker.

Accepted Answer

A) absorbed 
B) transmitted 
C) attenuated 
D) scattered 
A) absorbed 
B) transmitted 
C) attenuated 
D) scattered

Question 12

The Compton electron

Accepted Answer

A) typically exits the patient as part of the remnant radiation 
B) does not have enough energy to produce further interactions 
C) has enough energy to produce further interactions 
D) A and B 
A) typically exits the patient as part of the remnant radiation 
B) does not have enough energy to produce further interactions 
C) has enough energy to produce further interactions 
D) A and B

Question 13

With Compton scattering,the incident photon

Accepted Answer

A) loses none of its energy 
B) loses up to one third of its energy 
C) loses up to one half of its energy 
D) does not lose any energy 
A) loses none of its energy 
B) loses up to one third of its energy 
C) loses up to one half of its energy 
D) does not lose any energy

Question 14

Compton scattering involves the x-ray photon

Accepted Answer

A) being absorbed in the atom 
B) removing an inner-shell electron 
C) removing a middle- or outer-shell electron 
D) passing through the atom without any change 
A) being absorbed in the atom 
B) removing an inner-shell electron 
C) removing a middle- or outer-shell electron 
D) passing through the atom without any change

Question 15

The energy of the photoelectron is the least as a result of a photoelectric interaction in

Accepted Answer

A) bone 
B) soft tissue 
C) fat 
D) the energy level is the same for all 
A) bone 
B) soft tissue 
C) fat 
D) the energy level is the same for all

Question 16

Irradiation of water can create harmful free radicals that then indirectly damage molecules and cells.

Accepted Answer

A) True 
 B)False

Question 17

The photoelectric interaction and Compton interaction can both result in a characteristic cascade,producing characteristic radiation.

Accepted Answer

A) True 
 B)False

Question 18

Compton scattering results in

Accepted Answer

A) a Compton electron 
B) a secondary electron 
C) a Compton scatter photon 
D) all of the above 
A) a Compton electron 
B) a secondary electron 
C) a Compton scatter photon 
D) all of the above

Question 19

Secondary x-ray photons are the result of

Accepted Answer

A) Compton interactions 
B) Thompson scattering 
C) photoelectric interactions 
D) A and C 
A) Compton interactions 
B) Thompson scattering 
C) photoelectric interactions 
D) A and C

Question 20

No matter which direction the Compton scatter photon goes,it retains approximately

Accepted Answer

A) one fourth of its energy 
B) one third of its energy 
C) one half of its energy 
D) two thirds of its energy 
A) one fourth of its energy 
B) one third of its energy 
C) one half of its energy 
D) two thirds of its energy

Barium sulfate is used as a contrast agent to visualize soft tissue structures such as the stomach because it

Air is considered:

Pair production requires an x-ray photon with an energy of at least

The most radiosensitive molecule in the body is

The more the energy of the incident x-ray photon exceeds the binding energy of the inner-shell electron,the greater the probability of a photoelectric interaction.

The probability of Compton scattering depends on the atomic number of the atom.

Compton scattering typically occurs with

The Compton scatter photon

Without differential absorption,the image would be a single shade of gray.

For photoelectric interactions to occur,the energy of the incident photon

Radiation interacting with air is more likely to be _____________,resulting in that area of the image being darker.

The Compton electron

With Compton scattering,the incident photon

Compton scattering involves the x-ray photon

The energy of the photoelectron is the least as a result of a photoelectric interaction in

Irradiation of water can create harmful free radicals that then indirectly damage molecules and cells.

The photoelectric interaction and Compton interaction can both result in a characteristic cascade,producing characteristic radiation.

Compton scattering results in

Secondary x-ray photons are the result of

No matter which direction the Compton scatter photon goes,it retains approximately

Introduction to the Imaging Sciences

Structure of the Atom

Electromagnetic and Particulate Radiation

The X-Ray Circuit

The X-Ray Tube

X-Ray Production

Image Production

Image Quality and Characteristics

Radiographic Exposure Technique

Scatter Control

Image Receptors

Exposure Technique Selection

Image Intensified Fluoroscopy

Additional Equipment

Computed Tomography

Filters

Exam 7: X-Ray Interactions With Matter

Barium sulfate is used as a contrast agent to visualize soft tissue structures such as the stomach because it

Air is considered:

Pair production requires an x-ray photon with an energy of at least

The most radiosensitive molecule in the body is

The more the energy of the incident x-ray photon exceeds the binding energy of the inner-shell electron,the greater the probability of a photoelectric interaction.

The probability of Compton scattering depends on the atomic number of the atom.

Compton scattering typically occurs with

The Compton scatter photon

Without differential absorption,the image would be a single shade of gray.

For photoelectric interactions to occur,the energy of the incident photon

Radiation interacting with air is more likely to be _____________,resulting in that area of the image being darker.

The Compton electron

With Compton scattering,the incident photon

Compton scattering involves the x-ray photon

The energy of the photoelectron is the least as a result of a photoelectric interaction in

Irradiation of water can create harmful free radicals that then indirectly damage molecules and cells.

The photoelectric interaction and Compton interaction can both result in a characteristic cascade,producing characteristic radiation.

Compton scattering results in

Secondary x-ray photons are the result of

No matter which direction the Compton scatter photon goes,it retains approximately

Introduction to the Imaging Sciences

Structure of the Atom

Electromagnetic and Particulate Radiation

The X-Ray Circuit

The X-Ray Tube

X-Ray Production

Image Production

Image Quality and Characteristics

Radiographic Exposure Technique

Scatter Control

Image Receptors

Exposure Technique Selection

Image Intensified Fluoroscopy

Additional Equipment

Computed Tomography

Filters