RAD190-ch5.txt

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Author:
emerick9102
ID:
18042
Filename:
RAD190-ch5.txt
Updated:
2010-05-05 23:00:30
Tags:
radiography RADexam1 ch5
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Description:
chapter 5 review
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  1. Match the x-ray tube part with the appropriated description(s).
    A. anode B. cathode
    6. Positively charged
    7. Negatively charged
    8. Contains the target
    9. Contains the filament
    10. Heated to produce thermionic emission of electrons
    11. Often contains small and large filaments (dual focus) within a focusing cup
    6. A 7. B 8. A 9. B 10. B 11. B
  2. 99% of the energy of the electrons striking the target is converted to _______.
    Heat
  3. Electron striking the target interacts with target atom nucleus, slows down, losing kinetic energy
    • that is converted into an x-ray.
    • Bremsstrahlung x-ray
  4. Electron striking the target ejects inner shell electron of target atom; an outer shell electron fills
    • the vacancy with the release of an x-ray photon.
    • Characteristic x-ray
  5. Area of target which with which electrons interaction
    focal spot
  6. Propels electrons toward a specific area of the anode target
    focusing cup
  7. Rotates during exposure to distribute heat
    Anode
  8. Used to provide greater image detail.
    Small Filament
  9. The effective focal spot size is smaller than the actual focal spot size.
    true
  10. Because of the anode heel effect, radiation intensity is greater at the cathode and less at the anode ends of the x-ray beam.
    true
  11. To produce a more uniform radiographic density, thinner parts should be positioned under the anode portion of the x-ray beam.
    true
  12. Higher kVp results in x-rays that are less penetrating.
    false
  13. Higher kVp should be used for larger or more dense body parts.
    true
  14. The Pyrex glass envelope of the x-ray tube supports the electrodes and maintains a vacuum.
    true
  15. An exposure made at 200 mA, 0.1 sec, 80 kVp would have ___________ mAs.
    20
  16. ____________________ removes low energy x-ray photons from the x-ray beam that cause unnecessary patient exposure.
    filtration
  17. Radiation scatter production is increased when
    A. the collimator is wide open
    B. the kVp is high
    C. the body part is thick.
    D. all of the above
    d

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