kats final 15

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  1. What is the relationship between spatial frequency and spatial resolution?
    higher spatial frequency equals better spatial resolution
  2. CR scanners use what type of read out technique?  (will proabably find best answers from the article)
    point by point
  3. According to the article by Schaetzing, what is the trade off between absorption and resolution in regards to the phosphor layer of CR screens?
    thicker = better absorption, but creates greater unsharpness or loss of resolution/recorded detail
  4. define signal and noise. ?
    signal - photons stricking the IPnoise - disturbance that causes a loss of signal
  5. In direct conversion digital imaging, exit radiation is converent into what?  Where does this converstion occur and briefly stored?
    an electrical chargethe TFT array
  6. In digital imaging, what is subject contrast dependent upon?
    subject contrast depends on the x-ray beam energy and tissue characteristics.
  7. What does the photomultipler tube "do" to the visible light?
    collects, amplifies and converts it to an electrical signal
  8. What is ambient lighting and what is its relationship to viewing digital images?
    ambient lighting refers to how bright or dim the area is that is being used to view digital images.  It should be kept low
  9. 4 basic advantages to digital imaging.
    • image manipulation
    •  image transmission
    • image storge
    • image reconstruction
  10. Why do we consider brightness and density to have an inverse relationship?
    an image that has insufficient brightness is said to have excessive density
  11. Why does digital imaging have a higher dynamic range then film/screen?
    because it has a higher or greater ability to accurately capture a wider/higher/greater number/range of photon intensities that exit the patient
  12. According to the article by Schaetzing, the active layer of the SP screen is the site of three very important steps in forming of a digital image.What are these three?
    x-ray absorptioncreation and storage of the latent imagestimulated emission
  13. What happens to spatial resolution with a lower sampling frequency?
    it will decrease
  14. In digital imaging, what factor will have the ultimate control over brightness of the image?
    the computer
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kats final 15
kats final 15
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