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34 Cards in this Set
- Front
- Back
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1. Roentgens (or grays) is the measurement for x-ray ________.
a. quantity b. exposure c. intensity d. All of the above. |
d. All of the above.
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2. The number of useful x-rays in the beam defines x-ray
a. kVp. b. quality. c. quantity. d. mAs. |
c. quantity.
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3. Standard x-ray machines produce about ____ mR/mAs at 70 kVp measured at 100 cm SID.
a. 2 b. 5 c. 10 d. 20 |
b. 5
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4. X-ray quantity increases in direct proportion to increases in ______.
a. mAs b. kVp c. distance d. filtration |
a. mAs
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5. If the distance from the source to the image (SID) is reduced by half, how is the x-ray intensity at the image affected?
a. It is increased 4 times. b. It is doubled. c. It is reduced by ½. d. It is reduced by ¼. |
a. It is increased 4 times.
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6. If filter thickness is _______, then x-ray intensity is _______.
a. reduced, reduced b. increased, reduced c. reduced, increased d. Both b and c. |
d. Both b and c.
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7. A 10% increase in kVp has ______ effect on x-ray intensity than/as a 10% increase in mAs.
a. the same b. much greater c. less d. much less |
b. much greater
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8. If x-ray quantity is doubled, the optical density on the finished radiograph will be
a. reduced by half. b. just slightly increased. c. increased by a factor of two. d. increased by a factor of four. |
c. increased by a factor of two.
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9. If a technologist changes the technique from 70 kVp @ 200 mAs to 70 kVp @ 400 mAs, then the x-ray intensity will ______ and optical density will __________.
a. double, double. b. double, remain the same. c. remain the same, will remain the same. d. will remain the same, double. |
a. double, double.
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10. The inverse square law has the same effect on optical density and x-ray _______.
a. intensity b. exposure c. quantity d. All of the above. |
d. All of the above
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11. An increase of 15% in kVp is equivalent to increasing mAs _____.
a. 15%. b. 30%. c. 50% d. 100%. |
d. 100%.
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12. If the intensity of a 70 kVp exposure at 20 mAs is 100 mR, what would it be at 5 mAs?
a. 25 mR b. 50 mR c. 200 mR d. 400 mR |
a. 25 mR
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13. If an exposure is 50 mR at an SID of 40 inches, what would the exposure be at an SID of 60 inches?
a. 22.2 mR b. 33.3 mR c. 75 mR d. 112.5 mR |
a. 22.2 mR
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14. X-ray intensity is proportional to ______.
a. distance b. kVp c. kVp2 d. filtration |
c. kVp2
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15. The penetrability of an x-ray beam is called x-ray _______.
a. quantity b. quality c. intensity d. All of the above. |
b. quality
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16. An x-ray beam that could pass through dense tissue would have high _______.
a. penetrability b. quality c. quantity d. Both a and b. |
d. Both a and b.
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17. A low quality beam would also have low
a. penetrability. b. quantity. c. mAs. d. intensity. |
a. penetrability.
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18. Beam quality is affected by
a. mAs and distance. b. kVp and mAs. c. kVp and filtration. d. filtration and mAs. |
c. kVp and filtration.
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19. The half value layer (HVL) of an x-ray beam is a measurement of beam ______.
a. intensity b. quality c. quantity d. All of the above. |
b. quality
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20. Image contrast is affected by ________.
a. beam quality b. kVp c. mAs d. Both a and b. |
d. Both a and b.
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3. If an N shell electron fills an M shell vacancy, what is the energy of the photon produced?
A. 3.42 B. 2.22 C. 1.69 D. 4.7 |
B. 2.22
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The greatest number of photons on this graph are:
A. K B. L C. M D. N |
A. K
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Based on this illustration, what was the kVp selected?
A. 30 B. 69 C. 75 D. 95 |
D. 95
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Which of the following is the most likely cause of the change in the emission spectrum, represented by the light blue line?
A. mA B. kVp C. Filtration D. Target material |
A. mA
A decrease in mA changes the overall quantity of the beam, which causes a reduction in the height of the spectrum |
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Which of the following is the most likely cause of the change in the emission spectrum, represented by the light blue line?
A. mA B. kVp C. Filtration D. Target material |
B. kVp
A change in kVp will cause a reduction in the height of the spectrum and a shift to the left. |
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Which of the following is the most likely cause of the change in the emission spectrum, represented by the light blue line?
A. mA B. kVp C. Filtration D. Target material |
C. Filtration
Adding filtration removes photons from the beam (more so for low-energy photons), causing a reduction in the height of the spectrum (more so on the left side). |
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Penetration will result in which shades of the radiographic image?
A. Light or white B. Dark or black C. Both light and dark in equal numbers |
B. Dark or black
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Penetration is more likely with which photon energy?
A. High B. Low C. Does not depend on energy |
A. High
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Which of the following equates to patient dose?
A. Penetration B. Absorption C. Scatter |
B. Absorption
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Differential absorption involves which interaction?
A. Classical B. Compton C. Photoelectric D. Pair production |
C. Photoelectric
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Which of the following affects quantity?
1. kVp 2. mAs 3. distance A. 1 and 2 only B. 2 and 3 only C. 1 and 3 only D. 1, 2, and 3 |
D. 1, 2, and 3
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What happens to quality as mAs increase?
A. Increases B. Decreases C. Unaffected by mAs |
C. Unaffected by mAs
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Which of the following tissue types is likely to have the greatest number of photoelectric events?
A. Bone B. Muscle C. Soft tissue D. Fat |
A. Bone
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A photon of 10 MeV colliding with a nucleus will likely result in what type of interaction?
A. Pair production B. Photoelectric C. Compton D. Photodisintegration |
D. Photodisintegration
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