
RSAP 180 Final Exam Review
Authored by Kaylyn Grummett
Physics
University
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34 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Pitting of the anode commonly occurs (LO#5)
When the unit is not warmed up properly
When the anode is off-focus
With extended use
When the kilovoltage is too high
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What type of grid is typically used for mobile radiography? (LO#9)
5:1 parallel grid
8:1 focused grid
12:1 focused grid
16:1 parallel grid
Answer explanation
6:1 and 8:1 focused grids are commonly used in mobile radiography
3.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Given the technical factors below, calculate the mAs value.
68 kVp; 50 mA and 1850 ms (LO#1)
925 mAs
9.25 mAs
92.5 mAs
82.5 mAs
Answer explanation
To calculate mAs:
mAs = mA x exposure time (s)
50 mA x 1.85 s = 92.5 mAs
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
As kVp increases, what happens to the amount of Compton interactions? (LO#4)
Decreases by one quarter
Increases
Stays the same
Decreases by half
Answer explanation
As kVp is increased, it increases the penetrability of the x-ray photons. This results in more x-ray photons penetrating directly through the patient and interacting with the image receptor.
As kVp increases = increases compton scattering and decreases photoelectric absorption
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the ripple factor for a 3 phase 6 pulse generator? (LO#2)
3-4%
4-10%
100%
13-25%
Answer explanation
- Single Phase Generator:
100% ripple factor
- 3 phase 6 pulse generator: 13-25%% ripple factor. Voltage in the x-ray tube never falls below 75-87%of the kVp.
- 3 phase 12 pulse generator: 4-10% ripple factor. Voltage in the x-ray tube never falls below 90-96% of the kVp.
- High frequency generator: 1% ripple factor. Voltage in the x-ray tube never falls below 99% of the kV
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The following are recommendations used for extending tube life EXCEPT: (LO#5)
Warm up the anode following the manufacturer's recommendations
Do not hold rotor switch unnecessarily
Use higher - mA stations when possible
Do not rotate the tube housing from one position to another rapidly
Answer explanation
Ideally want to use lower mA stations when possible
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
If you could not use a grid for some reason, and had to resort to an alternative method of reducing scatter onto an image receptor, which technique could you use? (LO#6)
Use the Air Gap Technique
Use the SID Placement Technique
Place the tube closer to the patient
Turn the tube so that anode heel effect does not compensate
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