imaging, radiology positioning.txt

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Author:
kepling
ID:
90521
Filename:
imaging, radiology positioning.txt
Updated:
2011-06-13 19:54:49
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imaging radiology positioning
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imaging, radiology positioning
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  1. What is the pregnancy 10-day rule?
    There are genereally ten days b/t menstruation and ovulation where X-rays are safe b/c pregnancy cannot occur
  2. What are the five common x-ray foot views?
    • Dorsoplanar (st)
    • Lateral (st)
    • Medial oblique view/position (st)
    • Lateral oblique (sp)
    • Sesamoid axial (sp)
    • Calcaneal axial (sp)
  3. What happens to an image during a WB oblique x-ray?
    Magnified
  4. Dorsoplanar X-ray characteristics
    • cassette flat
    • stand on cassette
    • tube @ 15 deg.
    • central ray @ base of 2nd met
  5. Lateral View X-ray characteristics
    • Cassette upright
    • tube @ 90 degrees
    • medial ankle against cassette
    • central ray @ lateral cuneiform/cuboid
  6. Medial oblique position/view X-ray characteristics
    • cassette flat
    • tube @ 0 degrees
    • medial aspect of foot against cassette
    • central ray @ lateral aspect of 3rd metatarsocuneiform joint
  7. Lateral oblique (medial oblique projection) X-ray characteristics
    • Cassette flat
    • tube @ 0 degrees
    • lateral foot against cassette
    • central ray @ medial 1st metatarasocuneiform joint
    • foot rotated 45 degrees
  8. Sesamoid axial X-ray characteristics
    • Cassette upright
    • toes close to cassette
    • tube behind patient
    • central ray directed @ plantar surface to 3rd MPJ
  9. Calcaneal axial X-ray characteristics
    • Cassette flat
    • tube @ 25 degrees anterior directed
    • feet on cassette in "ski jump" position
    • Central ray @ achilles insertion and ankle joint
  10. What are the five common ankle views?
    • Anteroposterior (st)
    • Mortise (st)
    • Lateral (st)
    • Medial oblique internal (sp)
    • Lateral oblique external (sp)
  11. Anteroposterior x-ray characteristics
    • Cassette upright
    • tube 90 degrees
    • heel against cassette
    • central ray b/t malleoli
  12. Mortise Ankle x-ray characteristics
    • Cassette upright
    • Tube 90 degrees
    • heel against cassette
    • foot internally rotated 15 degrees (remove overlap)
    • Central ray b/t malleoli
  13. Why perform a Mortise Ankle x-ray?
    exposes mortise of the ankle and allows you to see if there are any tarsal coalitions or distinct malleoli fractures
  14. Lateral Ankle x-ray characteristics
    • Cassette upright
    • tube 90 degrees
    • medial ankle against cassette
    • central ray @ center of lateral malleoli
  15. Medial oblique internal of ankle x-ray characteristics
    • cassette upright
    • tube 90 degrees
    • heel against cassette while foot internally rotates 45 degrees
    • Central ray @ center, lateral of ankle b/t malleoli
  16. Lateral oblique internal of ankle x-ray characteristics
    • Cassette upright
    • tube 90 degrees
    • ankle against cassette while foot externally rotated 45 degrees
    • Central ray @ center, medial of ankle b/t malleoli
  17. x-ray controversy 1
    • Projection: named for where the ray enters and where it is directed to leave
    • View: what view you see on the image
    • Position: named for what part of foot is closest to cassette
  18. x-ray controversy 2
    Oblique view is often weight bearing and can cause magnification
  19. x-ray controversy 3
    • bilateral views are cheaper = good
    • bilateral views produce more scatter radiation due to larger field of intensity = bad
    • You have to take less x-rays which protects the patient = not really good b/c of extra scattering

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