Radiology: Alternative Imaging

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Radiology: Alternative Imaging
2015-04-07 17:09:04
Radiology Alternative Imaging

Radiology: Alternative Imaging
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  1. Ultrasonagraphy
    Uses sound waves for soft tissue evaluation
  2. Computed Tomography
    Uses x-rays and computers to show cross section anatomy
  3. Nuclear Sctintigraphy
    Uses radiographic material
  4. Echogenicity meaning
    Brightness of the returning echoes
  5. Anechoic meaning
    Blackness, usually fluid filled structures
  6. Hypoechoic meaning
    Dark grey echoes
  7. Hyperechoic meaning
    Brighter/white echoes
  8. Acoustic impedence meaning
    Intensity of returning signal that is dependent on tissue thickness
  9. Attenuation meaning
    Reduced intensity of sound waves as they pass through tissues
  10. Probe/transducer meaning
    Hand piece responsible for sending and receiving sound pulses , intensity varies from 3.0 MHz to 7.5 MHz
  11. How ultrasounds work
    Pulses of sound are sent into the body and milliseconds later the returning echoes are received. The strength and time of the returning signal to arrive are the major elements to construct the image, tissue densities conduct sound differently
  12. 2 types of ultrasound transducers
    • 1) Linear
    • 2) Sector, used for general purpose
  13. Linear transducer
    Large contact surface and produces a rectangular sound beam
  14. Sector transducer
    Small contact surface and produces and pie beam shape
  15. Mineral appearance
    Bright white
  16. Air appearance
    Bright white
  17. Organ soft tissue appearance
    Medium grey
  18. Connective tissue/fat appearance
    Moderate white
  19. Blood/homogenous fluid appearance
  20. Complex fluid (pus) appearance
    Black with internal speckle
  21. Ultrasound uses
    • 1) Organ function
    • 2) Biopsies/ Aspiration cytology 
    • 3) Echocardiography
    • 4) Pregnancy evaluation
  22. Computed Tomagraphy allows visualization of what
    Structures in sagittal, dorsal, transverse, and oblique planes without artifact from fat, rib, spine, pelvis or organs that may interfere with the detail
  23. CT unit is comprised of...
    • A movable bed where the patient lays and the
    • cradle moves through the opening of the gantry at specific distance increments
  24. CT requires what...
    • 1) General anesthesia
    • 2) Animal in lateral, VD, or DV position
  25. Nuclear sctintigraphy
    Non-invasive imaging procedure which uses a small amount of radioactive material (radionuclide) administered IV, transcolonically or aerosol insufflation
  26. What radioactive isotope that emits predominately gamma rays is most commonly used in veterinary medicine
    Technetium 99m
  27. Nuclear sctintigraphy mainly used for what
    Detect lameness in horses