Lecture 5 ~~~~~ FROM NOTES
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Questions and Answers

What is the spatial resolution of a solid-state receptor in terms of line pairs per millimeter (lp/mm)?

  • 25 lp/mm (correct)
  • 20 lp/mm
  • 30 lp/mm
  • 7 lp/mm
  • Which of the following is an advantage of digital imaging?

  • Ability to adjust brightness and contrast (correct)
  • Need for chemical processing
  • Longer image production time
  • Higher radiation dose
  • How does digital imaging compare to film in terms of resolution measured in lp/mm?

  • Digital imaging has a less forgiving resolution than film.
  • Digital imaging has a consistent lower resolution than film.
  • Digital imaging can sometimes match film's resolution. (correct)
  • Digital imaging always has higher resolution than film.
  • What is one major disadvantage of digital imaging equipment?

    <p>It has a high one-time purchase cost.</p> Signup and view all the answers

    What is the total number of greyscale values available in digital imaging systems?

    <p>242</p> Signup and view all the answers

    What is a disadvantage of film-based X-ray imaging systems?

    <p>They require chemical processing and take time.</p> Signup and view all the answers

    How do solid state receptors generate charge when exposed to X-rays?

    <p>They are essentially semi-conductors that detect X-rays.</p> Signup and view all the answers

    Which characteristic enhances the usability of phosphor plate receptors?

    <p>They are wireless and reusable.</p> Signup and view all the answers

    What is the primary method used to read the latent image captured by phosphor plate receptors?

    <p>Lasers that stimulate fluorescence.</p> Signup and view all the answers

    What is a characteristic of the Digora System used with phosphor plate receptors?

    <p>It incorporates a small circular magnet.</p> Signup and view all the answers

    Which of the following statements is true about digital imaging using solid state receptors?

    <p>They connect directly to computers for immediate viewing.</p> Signup and view all the answers

    Which component is essential in the processing stage of film-based X-ray imaging?

    <p>Chemical solutions for film development.</p> Signup and view all the answers

    What does the extent of fluorescence in a phosphor plate receptor indicate?

    <p>The level of X-ray exposure received.</p> Signup and view all the answers

    Study Notes

    Spatial Resolution

    • Spatial resolution, for digital imaging, is measured by pixel size
    • Phosphor Plates - 60 μm
    • Solid State Receptor - 20 μm

    Spatial Resolution for Film-Based Imaging

    • Can be measured via line pairs/mm (higher is better)
    • Phosphor Plates - 7 lp/mm
    • Solid State Receptor - 25 lp/mm
    • Film - 20 lp/mm

    Contrast

    • In digital imaging, there are 242 different grayscale values

    Post-Processing

    • Advantage of digital imaging is the ability to post-process and adjust brightness and contrast
    • Digital imaging has a broader exposure latitude, making it more tolerant to over and under-exposure compared to film
    • The forgiving nature of digital receptors decreases the likelihood of over or underexposed images
    • Over or underexposed images can be corrected through post-processing techniques

    Advantages and Disadvantages of Digital Imaging

    • Advantages
      • Lower radiation dose
      • No chemical processing, reducing processing artifacts
      • Rapid image production
      • Can post-process images
      • Digital storage and sharing of images
      • Images can be easily magnified
      • Software tools can aid measurements
    • Disadvantages
      • High cost (one-off fixed cost for buying equipment) - however overtime can reduce costs as you do not need to purchase consumables needed as part of the film-based imaging process

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    Description

    Explore the principles of digital imaging, including spatial resolution, contrast, and the advantages of post-processing. This quiz covers essential concepts such as pixel size in detectors and the comparison of digital to film-based imaging. Test your knowledge on the various aspects of digital imaging technology.

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