Question 1

What is the principal source of scatter radiation in radiography?

Accepted Answer

A)  Tube housing 
B)  Patient 
C)  Table 
D)  Collimator 
A)  Tube housing 
B)  Patient 
C)  Table 
D)  Collimator B

Question 2

When performing the collimator test,the four sides of the collimator must each be within ___% of the SID to be in control.

Accepted Answer

A)  1 
B)  1.5 
C)  2 
D)  3 
A)  1 
B)  1.5 
C)  2 
D)  3 C

Question 3

How does scatter radiation fog reduce the visibility of detail in a radiographic image?

Accepted Answer

A)  By increasing contrast 
B)  By increasing distortion 
C)  By decreasing contrast 
D)  By decreasing distortion 
A)  By increasing contrast 
B)  By increasing distortion 
C)  By decreasing contrast 
D)  By decreasing distortion C

Question 4

Which of the following reduces the amount of scatter radiation fog on a radiograph?
1) Decrease in kVp
2) Decrease in field size
3) Decrease in grid ratio

Accepted Answer

A)  1 and 2 only 
B)  1 and 3 only 
C)  2 and 3 only 
D)  1, 2, and 3 
A)  1 and 2 only 
B)  1 and 3 only 
C)  2 and 3 only 
D)  1, 2, and 3

Question 5

Compton scatter occurs when an x-ray photon interacts with which part of the atom in the patient's body?

Accepted Answer

A)  Inner shell electron 
B)  Outer orbital electron 
C)  Nucleus-protons 
D)  Nucleus-neutrons 
A)  Inner shell electron 
B)  Outer orbital electron 
C)  Nucleus-protons 
D)  Nucleus-neutrons

Question 6

What is one of the most important things a limited operator can do to control scatter radiation?

Accepted Answer

A)  Reduce the thickness of the part. 
B)  Maintain the correct field size. 
C)  Use the exposure technique chart. 
D)  Use the correct grid. 
A)  Reduce the thickness of the part. 
B)  Maintain the correct field size. 
C)  Use the exposure technique chart. 
D)  Use the correct grid.

Question 7

During the photoelectric effect,an incoming photon interacts with the atom in the patient's body. What happens to the photon with this effect?

Accepted Answer

A)  It scatters out of the body. 
B)  It is totally absorbed by the atom. 
C)  It scatters to a nearby atom. 
D)  It is totally absorbed by a nearby atom. 
A)  It scatters out of the body. 
B)  It is totally absorbed by the atom. 
C)  It scatters to a nearby atom. 
D)  It is totally absorbed by a nearby atom.

Question 8

The number of lead strips per inch is called:

Accepted Answer

A)  grid radius. 
B)  grid ratio. 
C)  focal range. 
D)  grid frequency. 
A)  grid radius. 
B)  grid ratio. 
C)  focal range. 
D)  grid frequency.

Question 9

Which of the following is used to check the collimator and beam alignment of the overhead tube crane?

Accepted Answer

A)  Wire test mesh 
B)  Densitometer 
C)  Collimator template and beam alignment cylinder 
D)  Collimator template and wire test mesh 
A)  Wire test mesh 
B)  Densitometer 
C)  Collimator template and beam alignment cylinder 
D)  Collimator template and wire test mesh

Question 10

The interactions that produce scatter radiation occur primarily in the:

Accepted Answer

A)  tabletop. 
B)  image receptor. 
C)  patient. 
D)  tube housing. 
A)  tabletop. 
B)  image receptor. 
C)  patient. 
D)  tube housing.

Question 11

The radiographic appearance of decreased density on the lateral margins of the image is most likely caused by grid:

Accepted Answer

A)  frequency. 
B)  motion. 
C)  ratio. 
D)  cutoff. 
A)  frequency. 
B)  motion. 
C)  ratio. 
D)  cutoff.

Question 12

As a general rule,a grid should be employed when the part thickness is greater than:

Accepted Answer

A)  4 cm. 
B)  10 cm. 
C)  18 cm. 
D)  12 in. 
A)  4 cm. 
B)  10 cm. 
C)  18 cm. 
D)  12 in.

Question 13

Grid cut-off will occur when the:
1) tube is off-center.
2) tube is tilted.
3) SID is too great.

Accepted Answer

A)  1 and 2 
B)  1 and 3 
C)  2 and 3 
D)  1, 2, and 3 
A)  1 and 2 
B)  1 and 3 
C)  2 and 3 
D)  1, 2, and 3

Question 14

The photoelectric effect occurs when an incoming photon from the primary beam interacts with which part of the atom in a patient's body?

Accepted Answer

A)  Inner shell electron 
B)  Outer shell electron 
C)  Nucleus-protons 
D)  Nucleus-neutrons 
A)  Inner shell electron 
B)  Outer shell electron 
C)  Nucleus-protons 
D)  Nucleus-neutrons

Question 15

Which of the following statements is true? If the kVp increases,the:

Accepted Answer

A)  number of photoelectric interactions increases. 
B)  scatter radiation fog increases. 
C)  Compton and photoelectric interactions increase. 
D)  Compton and photoelectric interactions decrease. 
A)  number of photoelectric interactions increases. 
B)  scatter radiation fog increases. 
C)  Compton and photoelectric interactions increase. 
D)  Compton and photoelectric interactions decrease.

Question 16

What prevents the lead strips in the grid from being seen on the radiograph?

Accepted Answer

A)  The grid oscillates. 
B)  The grid strips are parallel to the beam. 
C)  The kVp is above 60. 
D)  The lead strips blend in with kVp settings over 60. 
A)  The grid oscillates. 
B)  The grid strips are parallel to the beam. 
C)  The kVp is above 60. 
D)  The lead strips blend in with kVp settings over 60.

Question 17

If the size of the x-ray field increases,what happens to scatter radiation fog?

Accepted Answer

A)  It increases. 
B)  It decreases. 
C)  It remains the same. 
D)  It increases for the thorax, abdomen, and pelvis projections only. 
A)  It increases. 
B)  It decreases. 
C)  It remains the same. 
D)  It increases for the thorax, abdomen, and pelvis projections only.

Question 18

As compared to an 8:1 grid,a grid with a 12:1 ratio will:

Accepted Answer

A)  clean up scattered radiation less effectively. 
B)  require less precise centering. 
C)  require more exposure to make a satisfactory radiograph. 
D)  produce less radiographic contrast. 
A)  clean up scattered radiation less effectively. 
B)  require less precise centering. 
C)  require more exposure to make a satisfactory radiograph. 
D)  produce less radiographic contrast.

Question 19

Compton scatter that is directed from the patient back toward the x-ray tube is called:

Accepted Answer

A)  backscatter. 
B)  front scatter. 
C)  side scatter. 
D)  coherent scatter. 
A)  backscatter. 
B)  front scatter. 
C)  side scatter. 
D)  coherent scatter.

Question 20

Scatter radiation affects radiographic appearance by causing:

Accepted Answer

A)  increased distortion. 
B)  increased recorded detail. 
C)  decreased contrast. 
D)  decreased density. 
A)  increased distortion. 
B)  increased recorded detail. 
C)  decreased contrast. 
D)  decreased density.

Exam 9: Scatter Radiation and Its Control

What is the principal source of scatter radiation in radiography?

When performing the collimator test,the four sides of the collimator must each be within ___% of the SID to be in control.

How does scatter radiation fog reduce the visibility of detail in a radiographic image?

Which of the following reduces the amount of scatter radiation fog on a radiograph? 1) Decrease in kVp 2) Decrease in field size 3) Decrease in grid ratio

Compton scatter occurs when an x-ray photon interacts with which part of the atom in the patient's body?

What is one of the most important things a limited operator can do to control scatter radiation?

During the photoelectric effect,an incoming photon interacts with the atom in the patient's body. What happens to the photon with this effect?

The number of lead strips per inch is called:

Which of the following is used to check the collimator and beam alignment of the overhead tube crane?

The interactions that produce scatter radiation occur primarily in the:

The radiographic appearance of decreased density on the lateral margins of the image is most likely caused by grid:

As a general rule,a grid should be employed when the part thickness is greater than:

Grid cut-off will occur when the: 1) tube is off-center. 2) tube is tilted. 3) SID is too great.

The photoelectric effect occurs when an incoming photon from the primary beam interacts with which part of the atom in a patient's body?

Which of the following statements is true? If the kVp increases,the:

What prevents the lead strips in the grid from being seen on the radiograph?

If the size of the x-ray field increases,what happens to scatter radiation fog?

As compared to an 8:1 grid,a grid with a 12:1 ratio will:

Compton scatter that is directed from the patient back toward the x-ray tube is called:

Scatter radiation affects radiographic appearance by causing:

Role of the Limited X-Ray Machine Operator

Introduction to Radiographic Equipment

Basic Mathematics for Limited Operators

Basic Physics of Radiography

X-Ray Production

X-Ray Circuit and Tube Heat Management

Principles of Exposure and Image Quality

Digital Image Receptor Systems

Formulating X-Ray Techniques

Radiobiology and Radiation Safety

Introduction to Anatomy, positioning, and Pathology

Upper Extremity and Shoulder Girdle

Lower Extremity and Pelvis

Spine

Bony Thorax, Chest, and Abdomen

Skull, Facial Bones, and Paranasal Sinuses

Radiography of Pediatric and Geriatric Patients

Image Evaluation

Ethics, Legal Considerations, and Professionalism

Safety and Infection Control

Assessing Patients and Managing Acute Situations

Medications and Their Administration

Medical Laboratory Skills

Additional Procedures for Assessment and Diagnosis

Bone Densitometry

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