LRA 222 Final Exam New Latest Version 2025 Best
Studying Material with All Questions, Exams of Radiology
GRADED A
1. For radiographic procedures, scatter radiation is primarily the result of: Compton interaction.
2. The probability of a Compton interaction occurring is related to: the energy of the x-ray photon.
3. The two major factors that affect the amount of scatter radiation produced and exiting the patient are: volume of
tissue irradiated and kVp.
4. The volume of tissue irradiated is determined by: the area of collimation.
patient thickness. field size.
5. Which of the following produces the greatest amount of scatter radiation exiting the patient?: High kVp and large
field size. 6. The unrestricted primary x-ray beam is: round.
7. Increasing collimation (decreasing the field size) results in: decreased scatter production and higher contrast.
8. A significant amount of collimation will have what effect on the amount of radiation: reduce amount of radiation
reaching IR
9. When imaging the pelvis, changing from 14 × 17 collimation to 8 × 10 collimation requires: an increase in mAs.
10. A flat piece of lead with a hole in it that has a flange directed toward the patient is a(n): cone or cylinder.
11. The most effective and often used radiographic beam-restriction device is the: collimator.
12. The beam-restriction device that results in images with the most unsharpness around the edge of the image is the:
aperture diaphragm.
13. The field shape produced by a collimator is: rectangular.
14. The automatic collimator: automatically collimates to the IR size.
15. The grid is located: between the patient and IR.
16. Grids are typically used when:: part measures more than 10 cm and at least 60 kVp needed for the exam only. .
17. Grids absorb scatter radiation because the scattered photons: travel at an angle to the transmitted photons.
, 18. The number of lead lines per inch or centimeter is the grid: Grid frequency. 19. The relationship between the height
of the lead strips and the distance between them is the: Grid ratio.
20. Which of the following is the formula used to determine grid ratio?: Grid ratio = height of the lead strips/distance
between the lead strips
21. What is the grid ratio if the lead strips are 2.4 mm high, 0.02 mm wide, and 0.3 mm apart?: 8:1
22 Using a higher the grid ratio will: increase scatter clean up and increase radiographic contrast only.
23. Linear grids are the most commonly used because: the tube can be angled in the direction of the lead lines.
24. A grid with lead strips that run parallel to each other is a: parallel grid; nonfocused grid
25. The distance between the grid and the convergent line is the: focal distance 26. The recommended SIDs that can
be used with a focused grid is the: focal range
27. If all the convergent points were connected along the length of the grid they would form the: convergent line.
28. An IR that has a grid permanently attached to its front surface is a: grid cassette
29. Device that holds the IR: bucky.
30. What technical factor is increased when grid is being used?: mAs
31. The formula for the grid conversion factor is: GCF = mAs with grid/mAs without grid.
32. When the x-ray beam is angled across the lead strips you have _________
cutoff.: off-level
33. When the SID is above or below the focal range you have _________ cutoff.: off-focus
34. Absorption of transmitted photons by a grid caused by misalignment is: grid cutoff
35. Grid cutoff results in: reduced exposure to the IR.
may increased patient exposure. possible increased in
quantum noise.
36. The Moiré effect can be caused by: using a grid with a frequency similar to the CR laser scanning frequency and
using a grid cassette in the bucky.
Studying Material with All Questions, Exams of Radiology
GRADED A
1. For radiographic procedures, scatter radiation is primarily the result of: Compton interaction.
2. The probability of a Compton interaction occurring is related to: the energy of the x-ray photon.
3. The two major factors that affect the amount of scatter radiation produced and exiting the patient are: volume of
tissue irradiated and kVp.
4. The volume of tissue irradiated is determined by: the area of collimation.
patient thickness. field size.
5. Which of the following produces the greatest amount of scatter radiation exiting the patient?: High kVp and large
field size. 6. The unrestricted primary x-ray beam is: round.
7. Increasing collimation (decreasing the field size) results in: decreased scatter production and higher contrast.
8. A significant amount of collimation will have what effect on the amount of radiation: reduce amount of radiation
reaching IR
9. When imaging the pelvis, changing from 14 × 17 collimation to 8 × 10 collimation requires: an increase in mAs.
10. A flat piece of lead with a hole in it that has a flange directed toward the patient is a(n): cone or cylinder.
11. The most effective and often used radiographic beam-restriction device is the: collimator.
12. The beam-restriction device that results in images with the most unsharpness around the edge of the image is the:
aperture diaphragm.
13. The field shape produced by a collimator is: rectangular.
14. The automatic collimator: automatically collimates to the IR size.
15. The grid is located: between the patient and IR.
16. Grids are typically used when:: part measures more than 10 cm and at least 60 kVp needed for the exam only. .
17. Grids absorb scatter radiation because the scattered photons: travel at an angle to the transmitted photons.
, 18. The number of lead lines per inch or centimeter is the grid: Grid frequency. 19. The relationship between the height
of the lead strips and the distance between them is the: Grid ratio.
20. Which of the following is the formula used to determine grid ratio?: Grid ratio = height of the lead strips/distance
between the lead strips
21. What is the grid ratio if the lead strips are 2.4 mm high, 0.02 mm wide, and 0.3 mm apart?: 8:1
22 Using a higher the grid ratio will: increase scatter clean up and increase radiographic contrast only.
23. Linear grids are the most commonly used because: the tube can be angled in the direction of the lead lines.
24. A grid with lead strips that run parallel to each other is a: parallel grid; nonfocused grid
25. The distance between the grid and the convergent line is the: focal distance 26. The recommended SIDs that can
be used with a focused grid is the: focal range
27. If all the convergent points were connected along the length of the grid they would form the: convergent line.
28. An IR that has a grid permanently attached to its front surface is a: grid cassette
29. Device that holds the IR: bucky.
30. What technical factor is increased when grid is being used?: mAs
31. The formula for the grid conversion factor is: GCF = mAs with grid/mAs without grid.
32. When the x-ray beam is angled across the lead strips you have _________
cutoff.: off-level
33. When the SID is above or below the focal range you have _________ cutoff.: off-focus
34. Absorption of transmitted photons by a grid caused by misalignment is: grid cutoff
35. Grid cutoff results in: reduced exposure to the IR.
may increased patient exposure. possible increased in
quantum noise.
36. The Moiré effect can be caused by: using a grid with a frequency similar to the CR laser scanning frequency and
using a grid cassette in the bucky.
