Radiology

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Author:
sthomp88
ID:
56361
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Radiology
Updated:
2010-12-15 22:56:19
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Final Review week seven
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ch. twenty two, twenty three
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  1. Panoramic radiograph is used for what purposes?
    • evaluate impacted teeth
    • evaluate eruption patterns, growth, and development
    • detect diseases, lesions, and conditions of the jaws
    • examine the extent of large lesions
    • evaluate trauma
  2. Why should the panoramic film not be used to evaluate and diagnose caries or periapical lesions, or used as a substitute for intraoral films?
    images are not as sharp or defined
  3. a radiographic technique that allows the imaging of one layer or section of the body while blurring images from structures in other planes
    tomography
  4. the location and number of ___________ ________ influence the size and shape of the focal trough
    rotational centers
  5. a three dimensional curved zone in which structures are clearly demonstrated on a panoramic radiograph; it is used to determine where the dental arches must be positioned to achieve the clearest image
    focal trough
  6. the closer the rotation center is to the teeth, the ________ the focal trough
    narrower
  7. The collimator used in the panoramic x-ray machine is a lead plate with an opening in the shape of a _____ ______ _______
    narrow veritcal slit
  8. The tubehead of the panoramic unit is _______ in position, so that the x-ray beam is directed slightly _______
    • fixed
    • upward
  9. The tubehead of the panoramic unit always rotates ________ the pts head, and the film rotates _________ the patients head
    • behind
    • infront of
  10. mA and kVp settings on a panoramic unit are ____________, exposure time is __________
    • adjustable
    • fixed
  11. calcium tungstate screens emit _______ light, rare earth screens emit ______ light. Which of these two films is recommended and why?
    • bue
    • green
    • rare earth; it requires less x-ray exposure and is faster, so it reduces pt exposure more
  12. imaginary line that divides the pt's face into right and left sides.
    imaginary plane that passes through the top of the ear canal and the bottom of the eye socket
    • midsagittal
    • frankfort
  13. a radiopaque artifact seen on a panoramic film that is produced when a radiodense object (glasses, necklaces, earings, hairpins, dentures, napkin chains, hearing aids) it is seen on the opposite side of the film, and appears indistinct, larger, and higher than its counter part
    ghost image
  14. problem that causes - hard palate and nasal cavity superimposed over roots of maxillary teeth, loss of detail for max incisors, reverse smile line is seen
    chin is tipped up
  15. problem that causes - mandibular incisors blurred, exaggerated smile line
    chin tipped down
  16. If anterior teeth appear too skinny and are out of focus, pt was too far ______ on the focal trough. If anterior teeth appear fat and out of focus, the pt was too far _________ on the focal trough
    • forward
    • back
  17. Intensifying screens reduce image ________
    sharpness/quality
  18. What is the most common extra oral film?
    panoramic
  19. extra oral films are primarily used in what types of specialty professions?
    • orthodontics
    • oral surgery
  20. What size of films are most often used in extra oral films/
    • 5 x 7
    • 8 x 10
  21. true or false. Occlusal (size 4) films are sometimes used in EO radiography
    true
  22. what are the disadvantages of using a nonscreen (size 4 occlusal film) film for EO radiography?
    • it requires longer exposure time
    • it is smaller than a screen film
  23. composed of a series of thin lead strips embedded in a material that permits the passage of the x-ray beam, it is placed between the pt's head and the film, and it reduces the amount of scatter radiation that reaches the film during exposure
    grid
  24. What is a disadvantage of grid use?
    You must increase exposure time because of the lead strips
  25. used to examine the posterior region of the mandible and is valuable for children, pts with limited jaw opening due to fracture or swelling, and in pts who have difficulty with intraoral films
    lateral jaw projection
  26. two types of lateral jaw projections and their uses:
    • body of mandible - impacted teeth, fractures, and lesions in the body of mandible
    • ramus of mandible - third molars, large lesions, and fractures that extend into the ramus of the mandible
  27. purpose of film is to evaluate facial growth and development, trauma, and disease; film shows bones of face and skull and soft tissue profile place cassette perpendicular to the floor, left side of pt's head adjacent to cassette
    lateral cephalometric projection
  28. film demonstrates the frontal and ethmoid sinuses, orbits and oral cavity; pt's head and forehead are touching cassette
    posteroanterior projection
  29. purpose of film is to evaluate the maxillary sinus area, also demonstrates the frontal and ethmoid sinuses, orbits, and nasal cavity; pt faces cassette lifts chin and places it on cassette
    waters projection
  30. purpose of film is to identify position of the condyles, demonstrate base of skull, and evaluate fractures of the zygomatic arch; pt tips head and neck back as far as possible
    submentovertex projection
  31. identifies fractures of the condylar neck and ramus area; pt tips head down and opens mouth as wide as possible
    reverse towne projection
  32. purpose of film is to evaluate the superior surface of the condyle and the articular eminence
    transcranial projection

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