DMI 50B

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Author:
whitneyrtt
ID:
220264
Filename:
DMI 50B
Updated:
2013-05-19 14:33:47
Tags:
Fluoroscopy
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Description:
DMI 50B, fluoroscopy for final
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  1. How do radiographers make up for fluoroscopys low contrast?
    Administer contrast
  2. How are illumination levels measured?
    Lamberts
  3. What are the two structures of the eye responsibel for vision?
    Rods and Cones
  4. Describe the difference between Rods and Cones
    Rods- sensitive to light, used for scotopic (night), do not percieve color as well as cones

    Cones- respond to brighter light, used for photopic (daylight) vison, able to percieve fine detail, can distinguish between brightness levels
  5. What is visual acuity?
    ability to percieve fine detail
  6. What is contrast perception?
    Ability to detect difference between light levels
  7. What are the 5 parts of the image intensifier tube?
    • - input phosphor
    • - photocathode
    • - electrostatic lenses
    • - accelerating anode
    • - output phosphor
  8. What is theinput phosphor made out of and what is it's role?
    Cesium iodide- convert x-rays to light
  9. What is the role of the photocathode?
    • emits electrons when stimulated by light
    • - directly proportional
  10. What is the role of the electrostatic lenses?
    • Negatively charged elctrodes, plated on the inside surface of the glass
    • - Focuses the elctrons from photocathode to the output phosphor
  11. Whate is the role of the accelerating anode?
    • Positively charged, located in the neck of the tube
    • Accelerates electrons towards the output phosphor
  12. What is the output phosphor made of and what is its role?
    • Made of zinc cadmium sulfite
    • converts electrons from photocathode into light

    Light photons are multiplied by the output phosphor, resulting in a much brighter image

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