physic CH. 6 definitions

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RadTherapy
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183251
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physic CH. 6 definitions
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2012-11-14 20:45:49
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physics definitions
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physics ch.6 definitions
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  1. What consist of 2 sets of perpendicular sets of ceiling mounted rails.
    **most frequently used
    ** allows for longitudnal & transverse travel
    Ceiling Support
  2. What postition is considered to be centered above the exam table at the standard SID (source to image receptor distance)
    Preferred detent position
  3. What has a single column with rollers at each end and one attached to the ceiling rail and the other attached to the floor rail.
    ** xray tube slides up & down the column as the column rotates
    floor to ceiling support system
  4. What is a variation of the floor to ceiling support with 1 or 2 floor mounted rails.
    Floor support system
  5. What are ceiling mounted & provide for flexible x-ray tube positioning.
    The image receptor is attached to the other end of the c-arm
    C arm support system
  6. Emitted with equal intensity in all directions
    Isotropically
  7. WHat is the thin section of a glass envelope through which the useful beam emerges
    window
  8. Primary radiation used to form an image
    useful beam
  9. Secondary radiation emitted through the tube housing
    leakage radiation
  10. protects the tube from damage caused by rough handling
    mechanical support
  11. negative side of the xray tube; contains the filament and the focusing cup
    cathode
  12. positive side of an x-ray tube that contains the target
    anode
  13. maintain a constant electric potential between the electrons of the tube current & the enclosure therefore they have a longer life & are less likely to fail
    metal enclosure tubes
  14. coil of wire made out of tungsten.
    * part of the cathode that emits eletrons, resulting in a tube current
    filament
  15. emissions of electrons from a heated surface
    thermionic emissions
  16. metal shroud that surrounds the filament
    focusing cup
  17. xray tube designed to be turned off & on very rapidly for situations that require multiple exposures at precise exposure times
    grid controlled tubes
  18. device used to reduce the intensity of scatter radiation in the remnant x-ray beam
    grid
  19. electron cloud near the filament
    space charge
  20. Phenomenon of the space charge that makes it difficult for subsequent electrons to be emitted by the filament because of electrostatic repulsion.
    space charge effect
  21. filament current that has risen to its maximum valve because all available electrons have been used
    saturation current
  22. region of the anode target in which electrons interact to produce x-rays
    focal spot
  23. the filament embedded in a metal shroud
    focusing cup
  24. x-ray tube designed to be turned on & off very rapidly for situations that require multiple multiple exposures at precise exposure times
    grid controlled tubes
  25. device used to reduce the intensity of scatter radiation in the remnant x-ray beam
    grid
  26. electron cloud near the filament
    space charge
  27. phenomenom of hte space charge that makes it difficult for subsequent electrons to be emitted by the filament becuase of electrostatic repulsion
    space charge effect
  28. filament surrent that has risen to its maximum value because all available elctrons have been used
    saturation current
  29. emission of electrons from a heated surface
    thermionic emission
  30. anode used in imaging systems in which high tube current and power are not required
    stationary anode
  31. anode used in general purpose x-ray tubes because the tubes must be capable of producing high intensity x-ray beams in a short time
    rotating anode
  32. the region os an x-ray tube anode that is struck by electrons emitted by the filament
    target
  33. stationary coil winding located in the protective housing but outside the x-ray tube glass envelope
    stator
  34. rotating part of an electromagnetic induction motor that is located inside the glass envelope
    rotor
  35. design incorportated into x-ray tube targets to allow a large area for heating while a small focacl spot is maintained
    line focus principle
  36. x-rays produced in the anode but not at the focal spot
    off focus radiation
  37. energy emitted & transferred through matter
    radiation
  38. transfer of heat by molecular agitation
    conduction
  39. transfer of heat by the movement of hot matter to a colder place
    Convection
  40. Condition that results when the filament becomes thinner & breaks
    Open filament

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