MI Final ultrasound.txt

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MI Final ultrasound.txt
2011-08-10 13:57:41
MI Final ultrasound

MI Final ultrasound
Show Answers:

  1. common human velocity?
    1540 m/s
  2. What contrast do you get if two tissues are highly different?
    High contrast
  3. What contrast do you get if two tissues are similar?
    low contrast
  4. T/F high frequeny beams are used for deeper structures?
    F, low frequency beams used for deeper structures
  5. What is the common frequency for foot and ankle: high or low?
    High b/c not very deep structurally
  6. What is the common hertz measurement for Ultrasound sound waves?
    25,000 Hz
  7. How does ultrasound convert AC current to sound waves?
    Reverse Piezoelectric effect
  8. What is anisotropy?
    when the entire image is not clear b/c transducer not at 90 degrees
  9. What type of DUS is utilized to view blood flow?
    Power doppler
  10. What is tissue gain compensation?
    mechanism allowing all objects to be struck by same frequency
  11. What is obtunded?
    bulge of structure appearing on DUS
  12. What is fibrillar?
    Fibrous structure appearing on DUS
  13. What is the diff b/t hyper- and hypoechoic?
    • Hyper: white
    • Hypoechoic: black (anechoic)
  14. What is the max amount of fluid that should be in the ankle during an ultrasound?
  15. how much fluid should be around peroneal sheath?
    no more than 3mm
  16. How much fluid shoule be around PT tendon?
    no more than 4mm
  17. how much fluid should be around FHL, FDL?
  18. how much fluid should be around achilles tendon?
  19. how much fluid should be around the retrocalcaneal bursa?
    no more than 2-3mm
  20. sizes for medial, central and lateral bands of plantar fascia?
    • medial: 3-4mm.
    • central: 2-3mm
    • lateral: 2