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RADIOLOGY

  1. what are the 5 elements needed for x-ray production?
    • 1. source of electron
    • 2. a method to accelerate those electrons
    • (make them move faster or slower)
    • 3. obstacles free path for electrons to travel thru
    • 4. need a target on the anode that those electrons are going to hit
    • 5. need a vacuum (glass envelop) so that electtrons can pass thru without being defected
  2. what is the charge for a cathode?
    negative

    "Cathy is always negative"
  3. what is the charge for an anode?
    positive

    Cathy is always negative "and that is positively anoding"
  4. where are the electrons generated?
    cathode
  5. what is the filament?
    a lightbulb that gives off electrons when its heated
  6. what are you able to manipulate with the electrons?
    how many electrons and how powerful they are
  7. what does the collimators do?
    • make the x-ray beam smaller or wider
    • increases or decreases the primary beam
    • a beam limiting device
  8. what does it mean when you say that the led is radio opaque?
    x-rays can not go thru it
  9. what direction can you move the x-ray tube?
    up and down or side to side
  10. what generates the x-ray beams?
    the x-ray tube
  11. what determines how much electrons and how powerful they are?
    how much energy we give to the filament
  12. what does the cathode produce?
    a filament which heats up
  13. what is the filament made up of?
    tungsten
  14. where is the focal spot located?
    anode
  15. what is the anode made of?
    tungsten
  16. are you able to control the focal spot?
    no
  17. are anodes stationary or rotating?
    both but most are rotating which helps dissipate heat
  18. heel affect
    • the intensity of the x-ray beaam is not uniform
    • it is more intense toward the cathode side
    • this is an advantage when radiographing the thorax of a large dog
  19. where should you put the thickest part?
    towards the cathode side
  20. focal spot
    area of the target in which the electrons collide
  21. the smaller the focal spot...
    the better the clarity
  22. the larger the focal spot...
    the more shadow unsharpness you get
  23. which anodes have a larger focal spot and why?
    • stationary for the heat
    • it can't spin and can't dissipate heat so the focal spot has to be larger
  24. which anode have smaller focal spots and why?
    rotating anodes because of heat dispersion
  25. how can the cathode fail?
    filament can burn up and  fall apart
  26. how can the anode target fail?
    target on the anode can get zapped
  27. how can the anode bearing fail?
    because the anode spins on the bearing and can go bad
  28. what part of the tube can fail to work?
    • cathode
    • anode bearing
    • anode target
    • glass tube
    • tube housing
  29. true or false collimation decreases scatter radiation?
    true
  30. which one is more intense the primary beam or scatter radiation
    primary beam- never go under the primary beam
  31. what is the primary beam
    the part that lights up
  32. what does mA control
    the number of x-rays
  33. what is kVp?
    • the penitrating power of x-ray
    • how powerful they are
  34. what do you do if there is movement for example breathing
    have a shorter exposure time
  35. control panels
    • kVp
    • mA
    • time
    • exposure button- 2 stage exposure button
    • on/off switch
Author
vanessasoto
ID
222463
Card Set
RADIOLOGY
Description
chapter 2 flashcards
Updated

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