LRA 222 Final Exam New Latest Version 2025 Best Studying Material with All Questions, Exams of Radiology GRADED A
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Course
LRA 222
Institution
LRA 222
LRA 222 Final Exam New Latest Version 2025 Best
Studying Material with All Questions, Exams of Radiology
GRADED ALRA 222 Final Exam New Latest Version 2025 Best
Studying Material with All Questions, Exams of Radiology
GRADED ALRA 222 Final Exam New Latest Version 2025 Best
Studying Materi...
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.
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