Exposure Technique Factors
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1. Which of the following is accurate regarding the relationship between milliamperage (mA) and exposure time to maintain the exposure to the image receptor?
a) Directly proportional
b) Direct
c) Inverse
d) Inversely proportional
Ans:
D
2. A radiographic film image has excessive density. Which of the following is the best for correcting the exposure error?
a) Decrease kVp by 50%
b) Increase mAs by 15%
c) Decrease mAs by 50%
d) Decrease mAs by 15%
Ans:
C
3. What exposure factor affects both the quality and the quantity of the x-ray beam?
a) kVp
b) SID
c) mA
d) Focal spot size
Ans:
A
4. Which of the following is not affected by kilovoltage?
a) Compton interactions
b) Spatial resolution
c) Film density
d) Radiation quantity
Ans:
B
5. Increasing the mAs has __________ effect on brightness displayed in digital imaging.
a) A direct
b) An indirect
c) An inverse
d) No
Ans:
D
6. Which of the following would maintain radiation exposure to the image receptor when the kilovoltage is decreased by 15%?
a) Increase mAs by 15%
b) Increase mAs by 50%
c) Double the mAs
d) Halve the mAs
Ans:
C
7. A quality image is produced using 70 kVp and 25 mAs at a 40 in SID. What calculated change in the exposure technique is necessary to maintain radiation exposure to the image receptor when the SID is increased to 56 in?
a) 60 kVp at 25 mAs
b) 70 kVp at 12.5 mAs
c) 70 kVp at 50 mAs
d) 60 kVp at 50 mAs
Ans:
C
8.
Without exposure technique compensation, increasing the OID by 4 in for a knee
film image would
(1)
increase magnification
(2)
decrease density
(3) increase contrast
a) 1 and 2 only
b) 1 and 3 only
c) 2 and 3 only
d) 1, 2, and 3
Ans:
D
9. A quality image is produced using 80 kVp at 10 mAs with a 6:1 ratio grid. Calculate the change in exposure technique to maintain radiation exposure to the image receptor when changing to a 12:1 ratio grid.
a) 80 kVp at 17 mAs
b) 68 kVp at 20 mAs
c) 80 kVp at 6 mAs
d) 92 kVp at 5 mAs
Ans:
A
10. Which of the following factors does not affect spatial resolution?
a) Focal spot size
b) SID
c) OID
d) Grid
Ans:
D
11. Which of the following factors does not affect radiation exposure to the image receptor?
a) Collimation
b) Focal spot size
c) Compensating filters
d) Body habitus
Ans:
B
12. What exposure factor change is recommended to maintain radiation exposure to the image receptor when increasing the patient thickness by 5 cm?
a) Double the kVp
b) Double the mAs
c) Decrease kVp by 15%
d) Increase mAs by 15%
Ans:
B