Card Set Information

2014-06-16 15:30:31

Show Answers:

  1. Radiographic tomography is also known as (4)
    It was first developed when
    • body section radiography, planigraphy, stratigraphy, laminography
    • 1921
  2. what is tomography
    a special type of imaging used to obtain a diagnostic image of a specific layer of tissue or object which is superimposed by other tissues or objects
  3. it is another term used for severe loose bowel
    what is a term for a pt that is feeling queasy sick and close to vomiting
    • diarrhea
    • nauseous or nausea
  4. what kvp is most optimal for viewing a kidney stone on a KUB
    75 or less
  5. what two things affect how thin or thick a slice will be
    • the tube movement
    • tube trajectory (linear hypocycloidal etc..)
  6. a 10 degree movement of the tube produces what kind of slice
    thicker slice because tube movement is much less
  7. a 40 degree movement of the tube produces what slice
    thinner slice because the tube moves back and forth on a greater distance which is better for detail
  8. what two elements of the tomographic principle have a synchronized movement
    the xray tube and image receptor
  9. what are the three main elements of tomography
    IR tube and object
  10. what is the fulcrum
    • a pivot point on which tube and image receptor move
    • the middle portion
  11. Objects located at the fulcrum are said to be ______
    objects far away from the fulcrum are _____ due to motion
    • sharp
    • blurred
  12. structures above and below the level of the fulcrum are said to be _______ but would have been superimposed are now blurred due to _____
    • blurred
    • motion
  13. the greater the image is blurred the _____ it is to visualize sharp unblurred structures through the blurring
  14. the further an object is from the fulcrum the greater the _____
  15. An injection of what contrast is needed when going into the veins
    water soluble iodinated contrast
  16. After we take our nephrotomogram what are the positions needed after in an IVP/IVU (all positions)
    • scout
    • injection (note time at beginning)
    • 1 min nephrogram
    • 5min KUB
    • 15min KUB
    • 20min KUB Obliques RPO LPO
    • PA
    • Postvoid (of bladder only)
  17. what is tomographic amplitude
    it is the full path or total movement of the tube back and forth
  18. what is the exposure amplitude
    it is the tube movement of only when an exposure is made
  19. the fulcrum is the same as what 2 other terms
    focal plane and section interval
  20. what determines the focal plane and thereby controls the section level
  21. which degree produces a thicker cut
    25 or 50 deg
  22. what is the focal plane
    region within which the image exhibits satisfactory recorded detail and is controlled by the level of the fulcrum
  23. what is section thickness controlled by
    controlled by exposure angle or exposure amplitude
  24. what are section intervals
    distance between fulcrum levels (6cm 7cm 8cm)
  25. the tomographic/exposure amplitude has a ____ linear relationship to blur width
    direct = as amplitude increases blur increases an increase in amplitude produces a thinner slice = a better detail image
  26. objects outside the fulcrum or focal plane have good or bad detail
  27. the greater the tomographic amplitude or degree of movement of tube the greater the ____ and ____
    the further from the fulcrum the greater _____
    • blur and detail
    • blur increases
  28. tube trajectory has a  _____ relationship to the slice or cut
    • direct
    • the more complex the trajectory the thinner the cut
  29. in digital tomosynthesis image databases are created from how many exposures
  30. most tomographic images exhibit less ______ than static images of the same regions because of the decreased tissue densuty that is being imaged with a single section
  31. what is narrow angle tomography (zonography)
    under 10 deg movement produces thicker slices
  32. what is wide angle tomography
    more than 40 deg movement useful with very small bones in the ear which produces thinner slices better detail
  33. where is panoramic tomography used mainly
    in dental radiography
  34. what is autotomography
    • the pt motion and the IR and tube remain stationary "breathing techniques"
    • wagging jaw
    • ap scapula
    • rao sternum
    • lateral t spine
    • transthoracic lateral for proximal humerus