Image Reconstruction in CT Imaging
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Questions and Answers

What is the main difference between CT imaging and conventional radiography?

  • CT imaging generates a matrix of intensities, while conventional radiography forms an image directly on the image receptor. (correct)
  • CT imaging creates a 3D image, while conventional radiography creates a 2D image.
  • CT imaging uses x-rays to form an image, while conventional radiography uses a different type of radiation.
  • CT imaging creates an image directly on the image receptor, while conventional radiography uses data received to depict relative attenuation of x-rays.

    • What property of a tissue determines its x-ray attenuating ability?

  • The energy of the x-ray photon
  • The tissue's thickness
  • The tissue's molecular structure
  • The tissue's density (correct)

    • What is the relationship between a tissue's attenuation coefficient (μ) and the number of photons that reach the detector?

  • The higher the μ value, the higher the number of photons that reach the detector.
  • The relationship between μ and the number of photons is not mentioned in the text.
  • The μ value does not affect the number of photons that reach the detector.
  • The higher the μ value, the lower the number of photons that reach the detector. (correct)

    • What is the purpose of the image reconstruction process in CT imaging?

    <p>To mathematically generate tomographic images from x-ray projection data acquired at different angles.</p> Signup and view all the answers

    How does the attenuation coefficient (μ) of a tissue vary?

    <p>The μ value may be altered by both the tissue thickness and the energy of the x-ray photon.</p> Signup and view all the answers

    What is the relationship between a tissue's density and its attenuation coefficient (μ)?

    <p>The higher the tissue density, the higher its μ value.</p> Signup and view all the answers

    What is the main advantage of back-projection in CT image reconstruction?

    <p>It is quick and can reconstruct multiple slices per second</p> Signup and view all the answers

    Why is back-projection not commonly used in clinical CT?

    <p>It produces images with star patterns due to artifacts</p> Signup and view all the answers

    What does the filtered back-projection method aim to remove from CT images?

    <p>Blurring caused by star patterns</p> Signup and view all the answers

    Why does filtered back-projection require higher radiation doses compared to other methods?

    <p>To counteract the accentuated noise from filtering techniques</p> Signup and view all the answers

    Which aspect limits the spatial resolution in filtered back-projection?

    <p>The tissue attenuation in larger patients</p> Signup and view all the answers

    What is a major disadvantage of the filtered back-projection method in CT imaging?

    <p>Limited sensitivity to low contrast detectability</p> Signup and view all the answers

    In filtered back-projection, what happens when the negative and positive components are canceled?

    <p>Streak artifacts are reduced</p> Signup and view all the answers

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