RAD - IMAGING STUDY QUESTIONS

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anatomy12
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273037
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RAD - IMAGING STUDY QUESTIONS
Updated:
2014-05-03 20:15:19
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xray
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xray
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  1. which of the following will affect radiographic contrast
    grid devices
    small focal spot
    beam restrictors
    grids and beam restrictors
  2. which of the following have an effect on recorded detail
    focal spot size
    kvp
    source to image distance
    fss and source to image distance
  3. intensyfying screens with a speed at 200 will:
    require 50% less exposure than 100 speed screens
    increase the production of scatter radiation
    enable the radiographer to decrease the exposure time
    1 and 3
  4. which of the following is not a charactteristic of an intensyfiying screen:
    high atomic number
    high conversion efficiency
    high phosphorescence
    appropriate spectral matching
    high phosphorescence
  5. an increase in radiographic density will most likely result from:
    kvp
    mas
     grid ratio
    fss
    grid ratio
  6. when IS screens continues to glow after the xray exposure has ended the screen is said to posses:
    fluorescence
    incandescence
    luminescence
    phosphorescence
    phosphorescence
  7. radiographic sharpness(detail) is directly proportional to:
    SID
    screen speed
    FSS
    SID
  8. quantum mottle is most obvious when using:
    slow speed screens
    rare earth screens
    fine grain film
    minimal filtration
    rare earth screens
  9. which of the following is NOT related to radiographic contrast
    OID
    grid
    photon energy
    FSS
    FSS
  10. umbra (geometric sharpness) is greatest where
    directly along the course of the central ray
  11. direct exposure (non screen) radiography is rarely employed today because it:
    produces excessive contrast
    produces excessive density
    produces insufficient detail
    requires excessive pt dose
    requires excessive pt dose
  12. which of the following will cause an increase in subject contrast
    increase of mas
    increase grid ratio
    decreasing kvp
    • increasing grid ratio
    • decreasing kvp
  13. which of the following contribute to quantum mottle
    high speed film/screen combinations
    high mAs, low kvp factors
    low mas, high kv factors
    • high speed film/screen combinations
    • low mas high kv factors
  14. which of the following will decrease recorded detail
    increase fss
    decrease in screen speed
    an increase in SID
    a decrease in OFD
    increase in FSS
  15. which of the following is not classified as a rare earth phosphor
    lathanum oxybromide
    gadolinium oxysulfide
    calcium tungstate
    yttrium
    calcium tungstate
  16. the form of spectral matching refers to the fact that film sensitivity must be matched with the:
    proper color screen fluorescence
    correct kvp
    correct ma level
    proper developer concentration
    proper color screen fluorescence
  17. with a given exposure as intensifying screen speed increases how is radiographic density affected:
    density decreases
    density increases
    density remains unchanged
    density is variable
    density increases turns to black faster
  18. what terms describes a picture element the smallest area represented in a digital image
    pixel
    coxel
    matrix
    modulation transfer function
    pixel
  19. when involuntary motion must be considered the exposure time may be cut in half if the kvp is
    doubled
    increased 15%
    increased 25%
    increased 35%
    increased 15% b/c mas is cut in half kvp goes up 15%
  20. if the developer temperature in the automatic process is higher than normal what will be the effect on the finished radiograph:
    decreased contrast
    increased density
    increased contrast
    • increased density
    • increased contrast
  21. which of the following will increase contrast
    increase collimation
    increase grid ratio
    increase SID
    increase collimation and grid ratio grids because it gets rid of more scatter scatter makes image gray so it will be brighter
  22. which of the following would increase the number of photons striking the IR
    increase SID
    increase OID
    increase kvp
    increase beam restriction
    increase the kvp
  23. recorded detail is improved when an object is imaged by more perpendicular rays rather than divergent rays. this may be accomplished by
    increase SID
    incresing OID
    decreasing SID
    using an angle on tube
    increasing SID
  24. which of the following has an effect on radiographic density
    collimation
    kv selection
    SID
    collimation kv and SID
  25. all of the following will have an effect on recorded detail except:
    FSS
    SID
    grid ratio
    motion
    grid ratio
  26. which of the following are affected by film/screen combination
    density
    film contrast
    recorded detail
    • density
    • film contrast
    • recorded detail
  27. the relative speed of the intensifying screen and the mAs needed to provide adequate density have which type of relationship:
    inversely proportional
    directly propoprtional
    relative speed squared equals the mAs
    non of the above
    none
  28. the layer of the IS closest to the film is
    protective coat
    base
    relfective layer
    emulsion layer
    protective coat
  29. the reflective layer in the IS can be made of:
    titanium dioxide
    zinc sulfide
    calcium tungstate
    polyester
    titanium dioxide
  30. fluctuations in brightness that are unrelated to the object being imaged can be collectively described as:
    image nose
    matrxi size
    picture elements
    exposure latitude
    image noise
  31. which of the following would be the least likely cause of poor form film/screen contact
    a foreign object in the cassette
    dirt or dust in the IS
    a warped casette
    damage to the foam pressure pad the screen is mounted on
    dirt or dust in the IS
  32. how much is the latent image is formed by light photons
    99
    75
    15
    32
    99%
  33. how does the presence of a reflective layer affect patient dose
    decreases amt of light hitting the film decreasing pt dose
    requries increase in tech factors increasing pt dose
    it increase the amt of light hitting the film therefore decreasing pt dose
    it increase the amt of light hitting the film therefore decreasing pt dose
  34. the emission spectra for gadolinium oxysulfide is
    green
    blue
    red
    purple
    green
  35. which of the is not considered a way to measure film.screen resolution
    lines per millimeter
    lines spread function
    pin hole camera
    modulation transfer function
    pin hole camera
  36. the normal life span of an IS is
    10 yrs
    5-7
    1-2
    5-7 yrs
  37. window width in CR and DR controls what image property
    density
    contrast
    recorded detail
    algorithm
    contrast
  38. what would be the result of mismatching screen emission spectra
    film would have excessive density
    film would have inadequate density
    film would be fogged
    film would not be affect4ed
    film have inadequate density
  39. which of the following changes would not produce an increase in radiographic density?
    10mas -13 mas
    200 ma -100ma
    .2sec to .7
    50kv to 65kv
    200 -100 ma will not because it is a decrease out of all the choices
  40. which of the following would not produce an increase in radiographic contrast
    90-70kv
    100 f/s speed to 400 f/s speed
    heavy patient to thin patient
    10:1 grid to 5:1 grid
    10:1 grid to 5:1 grid
  41. which of the following will occur if exposure time is increased
    ma increases
    density increases
    motion may increase
    • density and motion may increase because longer time for room for movement and more radiation gets to tube with longer exposure time
    • it is not ma because as time increase ma decreases not increases
  42. if the distance between the xray tube and the IR is doubled, the mAs required to maintain IR exposure or radiographic density for a repeat image is
    doubled
    halfed
    quadrupled
    reduced by 4
    quadrupled
  43. the relationship between time and density.IR exposure is
    direct
    inverse
    directly proportional to the square of the distance
    inversely proportional to the square of the distance
    directly proportional to the square of the distance
  44. an increase in filtration would ___ contrast
    increase
    decrease
    not affect
    decrease idk why just memorize
  45. a decrease in replenishment rate would ___ film density
    increase
    decrease
    not affect
    decrease
  46. a significant increase in ofd would ___ contrast
    increase
    decrease
    not affect
    increase
  47. an increase in flm/screen speed would ___ recorded detail
    decrease
  48. a decrease in ma would ___ density/IR exposure
    increase
    decrease
    not affect
    decrease

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