Question 1

Also called lateral decentering,the _____ grid error results when the central ray is not aligned to the middle of a focused grid.

Accepted Answer

A)  off-level 
B)  off-focus 
C)  off-center 
D)  upside-down focused 
A)  off-level 
B)  off-focus 
C)  off-center 
D)  upside-down focused C

Question 2

What type of grid error results in appropriate exposure to the middle of the IR and marked underexposure along the sides of the IR?

Accepted Answer

A)  Stationary grid 
B)  Upside-down focused grid 
C)  Lateral decentering 
D)  Off-level 
A)  Stationary grid 
B)  Upside-down focused grid 
C)  Lateral decentering 
D)  Off-level B

Question 3

The amount of mAs required with a grid divided by the amount of mAs needed without a grid is the calculation that determines the:
1)Grid ratio
2)Grid conversion factor
3)Bucky factor

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 C

Question 4

When a grid is needed but not available,the _____ may be used for certain examinations.

Accepted Answer

A)  tomographic technique 
B)  air-gap technique 
C)  Seldinger technique 
D)  reverse collimation technique 
A)  tomographic technique 
B)  air-gap technique 
C)  Seldinger technique 
D)  reverse collimation technique

Question 5

What is the result of imaging a thicker part or patient?

Accepted Answer

A)  More Compton interactions 
B)  Decreased scatter 
C)  Increased radiographic contrast 
D)  Decreased fog 
A)  More Compton interactions 
B)  Decreased scatter 
C)  Increased radiographic contrast 
D)  Decreased fog

Question 6

Grid frequencies can range from:

Accepted Answer

A)  10 to 30 lines per centimeter 
B)  25 to 80 lines per centimeter 
C)  60 to 120 lines per centimeter 
D)  25 to 80 lines per inch 
A)  10 to 30 lines per centimeter 
B)  25 to 80 lines per centimeter 
C)  60 to 120 lines per centimeter 
D)  25 to 80 lines per inch

Question 7

If an excellent knee radiograph is produced using 10 mAs and an 8:1 ratio grid,how much mAs will be needed if no grid is available?

Accepted Answer

A)  2.5 mAs 
B)  4 mAs 
C)  8 mAs 
D)  10 mAs 
A)  2.5 mAs 
B)  4 mAs 
C)  8 mAs 
D)  10 mAs

Question 8

Which of the following beam-restricting devices is least effective at limiting unsharpness surrounding the radiographic image?

Accepted Answer

A)  Collimator 
B)  Cylinder cone 
C)  Aperture diaphragm 
D)  Focused grid 
A)  Collimator 
B)  Cylinder cone 
C)  Aperture diaphragm 
D)  Focused grid

Question 9

The larger the x-ray beam field size,the _________ the amount of scatter radiation produced.

Accepted Answer

A)  greater 
B)  lesser 
A)  greater 
B)  lesser

Question 10

Decreasing grid ratio (with no change in frequency)results in _____________scatter cleanup and ____________ lead content.

Accepted Answer

A)  decreased; decreased 
B)  decreased; increased 
C)  increased; decreased 
D)  increased; increased 
A)  decreased; decreased 
B)  decreased; increased 
C)  increased; decreased 
D)  increased; increased

Question 11

Patient dose increases when:
1)Changing from a higher to a lower grid ratio
2)Changing from a lower to a higher grid ratio
3)A grid is used

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 12

What occurs when the x-ray beam is not properly aligned with the grid strips?

Accepted Answer

A)  Bucky delamination 
B)  Grid cutoff 
C)  Increased exposure to the IR 
D)  Nothing 
A)  Bucky delamination 
B)  Grid cutoff 
C)  Increased exposure to the IR 
D)  Nothing

Question 13

As beam restriction increases,the quantity of scatter radiation __________ and radiographic contrast ___________.

Accepted Answer

A)  increases; increases 
B)  decreases; increases 
C)  decreases; decreases 
D)  increases; decreases 
A)  increases; increases 
B)  decreases; increases 
C)  decreases; decreases 
D)  increases; decreases

Question 14

Decreasing collimation results in:

Accepted Answer

A)  a smaller field size. 
B)  a larger field size. 
C)  decreased patient dose. 
D)  less scatter production. 
A)  a smaller field size. 
B)  a larger field size. 
C)  decreased patient dose. 
D)  less scatter production.

Question 15

An adult's knee measuring 14 cm should be radiographed without a grid.

Accepted Answer

A) True 
 B)False

Question 16

The purpose of the mirror inside the collimator is to:

Accepted Answer

A)  allow the patient to see the radiographer. 
B)  allow the radiographer to see the patient. 
C)  project a light field onto the patient. 
D)  none of the above. 
A)  allow the patient to see the radiographer. 
B)  allow the radiographer to see the patient. 
C)  project a light field onto the patient. 
D)  none of the above.

Question 17

Grids that move during the exposure:

Accepted Answer

A)  are reciprocating grids. 
B)  move from top to bottom. 
C)  are part of the Potter-Bucky diaphragm. 
D)  A and C. 
A)  are reciprocating grids. 
B)  move from top to bottom. 
C)  are part of the Potter-Bucky diaphragm. 
D)  A and C.

Question 18

Digital IRs are less sensitive to scatter radiation than are film-screen IRs.

Accepted Answer

A) True 
 B)False

Question 19

What is the grid conversion factor for a 12:1 ratio grid?

Accepted Answer

A)  3 × 
B)  4 × 
C)  5 × 
D)  6 × 
A)  3 × 
B)  4 × 
C)  5 × 
D)  6 ×

Question 20

Which of the following influences the amount of scatter radiation striking the image receptor but not the production of scatter radiation?

Accepted Answer

A)  Reduce the exposure field size. 
B)  Reduce the tissue thickness. 
C)  Increase the grid ratio. 
D)  Ask a patient with a large abdomen to lie prone instead of supine. 
A)  Reduce the exposure field size. 
B)  Reduce the tissue thickness. 
C)  Increase the grid ratio. 
D)  Ask a patient with a large abdomen to lie prone instead of supine.

Also called lateral decentering,the _____ grid error results when the central ray is not aligned to the middle of a focused grid.

What type of grid error results in appropriate exposure to the middle of the IR and marked underexposure along the sides of the IR?

The amount of mAs required with a grid divided by the amount of mAs needed without a grid is the calculation that determines the: 1)Grid ratio 2)Grid conversion factor 3)Bucky factor

When a grid is needed but not available,the _____ may be used for certain examinations.

What is the result of imaging a thicker part or patient?

Grid frequencies can range from:

If an excellent knee radiograph is produced using 10 mAs and an 8:1 ratio grid,how much mAs will be needed if no grid is available?

Which of the following beam-restricting devices is least effective at limiting unsharpness surrounding the radiographic image?

The larger the x-ray beam field size,the _________ the amount of scatter radiation produced.

Decreasing grid ratio (with no change in frequency)results in _scatter cleanup and lead content.

Patient dose increases when: 1)Changing from a higher to a lower grid ratio 2)Changing from a lower to a higher grid ratio 3)A grid is used

What occurs when the x-ray beam is not properly aligned with the grid strips?

As beam restriction increases,the quantity of scatter radiation and radiographic contrast _.

Decreasing collimation results in:

An adult's knee measuring 14 cm should be radiographed without a grid.

The purpose of the mirror inside the collimator is to:

Grids that move during the exposure:

Digital IRs are less sensitive to scatter radiation than are film-screen IRs.

What is the grid conversion factor for a 12:1 ratio grid?

Which of the following influences the amount of scatter radiation striking the image receptor but not the production of scatter radiation?

Radiation and Its Discovery

The X-Ray Beam

Image Formation and Radiographic Quality

Digital Imaging

Film-Screen Imaging

Exposure Technique Factors

Exposure Technique Selection

Image Evaluation

Dynamic Imaging: Fluoroscopy

Filters

Exam 7: Scatter Control

Also called lateral decentering,the _____ grid error results when the central ray is not aligned to the middle of a focused grid.

What type of grid error results in appropriate exposure to the middle of the IR and marked underexposure along the sides of the IR?

The amount of mAs required with a grid divided by the amount of mAs needed without a grid is the calculation that determines the: 1)Grid ratio 2)Grid conversion factor 3)Bucky factor

When a grid is needed but not available,the _____ may be used for certain examinations.

What is the result of imaging a thicker part or patient?

Grid frequencies can range from:

If an excellent knee radiograph is produced using 10 mAs and an 8:1 ratio grid,how much mAs will be needed if no grid is available?

Which of the following beam-restricting devices is least effective at limiting unsharpness surrounding the radiographic image?

The larger the x-ray beam field size,the _________ the amount of scatter radiation produced.

Decreasing grid ratio (with no change in frequency)results in _____________scatter cleanup and ____________ lead content.

Patient dose increases when: 1)Changing from a higher to a lower grid ratio 2)Changing from a lower to a higher grid ratio 3)A grid is used

What occurs when the x-ray beam is not properly aligned with the grid strips?

As beam restriction increases,the quantity of scatter radiation __________ and radiographic contrast ___________.

Decreasing collimation results in:

An adult's knee measuring 14 cm should be radiographed without a grid.

The purpose of the mirror inside the collimator is to:

Grids that move during the exposure:

Digital IRs are less sensitive to scatter radiation than are film-screen IRs.

What is the grid conversion factor for a 12:1 ratio grid?

Which of the following influences the amount of scatter radiation striking the image receptor but not the production of scatter radiation?

Radiation and Its Discovery

The X-Ray Beam

Image Formation and Radiographic Quality

Digital Imaging

Film-Screen Imaging

Exposure Technique Factors

Exposure Technique Selection

Image Evaluation

Dynamic Imaging: Fluoroscopy

Filters

Decreasing grid ratio (with no change in frequency)results in _scatter cleanup and lead content.

As beam restriction increases,the quantity of scatter radiation and radiographic contrast _.