Kats Final Chapter 10 pt1

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Kats Final Chapter 10 pt1
2014-04-26 21:12:47
Kats Final Chapter 10 pt1

Kats Final Chapter 10 pt1
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  1. The use of high-mAs, low-kVp and of slower image receptors reduces______ .
    quantum mottle.  
  2. Fast image receptors have___ noise and low spatial resolution and low contrast resolution. 1)no Noise
    2)Low Noise
    3)High Noise
  3. Fast image receptors have High noise and____ spatial resolution and low contrast resolution.
    1)no spatial resolution 

    2)Low spatial resolution 

    3)High spatial resolution 
    2 Low
  4. Radiographic noise has four components:
    • film graininess,
    • structure mottle,
    • quantum mottle,  
    • scatter radiation.
  5. ·        
    The principal source of radiographic noise is 
    scatter radiation  
  6. Distribution of phosphor crystals in an intensifying screen is called 
    Structure mottle 
  7. Radiographic noise produced by the random interaction of x-rays with an intensifying screen. This effect is more noticeable when very high rare Earth systems are used at a high kVp.  this is called
    Quantum mottle
  8. Lower noise results in a better radiographic image because it improves contrast resolution.  
    true or false
  9. The Ability to image small objects that have high subject contrast is called.....
    Spatial resolution
  10. Spatial resolution improves as screen blur 1)decreases
    3)No Change,
  11. the ability to distinguish anatomical structures of similar subject contrast such as liver–spleen and gray matter–white matter.is
    Contrast resolution
  12.  refers to the ability to visualize recorded detail when image contrast and optical density (OD) are optimized.  
    Visibility of detail
  13. Degree of sharpness of structural lines on a radiograph. 
  14. the random fluctuation in the OD of the image.
    Radiographic noise
  15. Sensitivity is the ability of the CCD to detect and respond to very____  levels of visible light 
  16. ________ is the ability of the CCD to respond to a wide range of light intensity, from very dim to very bright. 
    Dynamic range
  17. The CCD has Lower sensitivity for radiation and a much wider dynamic range than screen-film image receptors. 
    True or False
  18. CsI/CCD is an indirect DR process by which x-rays are converted first to light and then to electric signal.  .
    True or False
  19. The percentage of the pixel face that is sensitive to x-rays is the ______. 
    fill factor
  20. The fill factor is approximately___%; therefore, ___% of the x-ray beam does not contribute to the image.  
    • 80%
    • 20%
  21. _________ in DR is pixel limited. 
    Spatial resolution
  22. a-____ is a direct DR process by which x-rays are converted to electric signal.  
  23. special optics that can keep beam size shape and speed independent of the beam position
    beam shapeing optics
  24. moves laser beam rapidly back and fourth across the screen to stimulate sequentaily  each point along the scar line
    Beam Deflector 
  25. the _____ are used to collect as much of the emitted light from the screen and channel with minimal loss to the photo-detector where it is converted into a electrical image
    Light Collection Optics
  26. the____ plays a crucial role in keeping the   stimulated light from entering the photo detector and swamping the desired image signal 
    optic filter 
  27. the___ converts the emited light photons into an electrical signal that can be processed into a digital image
  28. ______ refers to a continuously varying quantity; a digital system uses only two values that vary discretely through coding.  .