DI 4

The flashcards below were created by user jld15 on FreezingBlue Flashcards.

  1. Bone scan advantages and disadvantages
    • High sensitivity, low specificity
    • Poor anatomy
    • Radiation
  2. Reverse piezoelectric effect
    • Electrical energy into crystal→ deformation → sound energy
    • US
  3. Piezolectical effect
    • sound energy reflects off tissues turning into electrical energy → image
    • DU
  4. What is US imaging based off of?
    • Reflection of sound energy
    • Amount of reflection determine by echogenicity
  5. Echogenicity
    Ability of tissue to reflect energy
  6. Hyperechoic
    • Bone
    • Tendon
    • nerve
  7. Anechoic
    Cyst
  8. Hypoechoic
    Muscle w/ hyperechoic fat
  9. Advantages of US
    • 1. low cost
    • 2. portable
    • 3. can image w hardware
    • 4. can do w/ dynamic movement
    • 5. can compare sides
  10. Disadvantages of US
    • 1. Operator dependent
    • 2. Bad of obese pts
    • 3. *** cannot cross bone (cant see in SC)
    • 4. time consuming
  11. Advantages and Disadvantages of Radiographs
    • Fast, cheep, readily available
    • Not as good as MR and CT for certain conditions
  12. How does a radiograph work?
    X-rays penetrate body causing ionization (darkening) of the silver atoms on the film whenever the item is radiotranslucent
  13. Radiograph White vs gray
    • Based on density of object
    • Bone: white
    • Water/ muscle/ soft tissue: gray (more dense than air)
    • Fat: black
    • Air :black
  14. Radiograph radiodensity dependent on
    Thickness and shape
Author
ID
321428
Card Set
DI 4
Description
DI 4
Updated
Show Answers