Image Reconstruction and Interpolation in Helical CT
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Questions and Answers

What is the main purpose of interpolation algorithms in helical CT scans?

  • To reconstruct axial images from the spiral volume data set (correct)
  • To reduce motion artifacts
  • To enhance 3D renderings
  • To increase the speed of the scan

    • What is the definition of pitch in helical CT scans?

  • The speed of the table motion during the scan
  • The ratio of table displacement per 360° rotation to section thickness (correct)
  • The width of the x-ray beam
  • The overlap between consecutive helical loops

    • What happens when the pitch is less than 1 in a helical CT scan?

  • The patient dose is reduced
  • There is a gap between the x-ray beam edge of the consecutive loops
  • The coils of the helix overlap (correct)
  • The x-ray beam associated with consecutive helical loops is contiguous

    • What is the main advantage of a helical CT scanner compared to a conventional CT scanner?

    <p>All of the above</p> Signup and view all the answers

    What happens when the pitch is greater than 1 in a helical CT scan?

    <p>There is a gap between the x-ray beam edge of the consecutive loops</p> Signup and view all the answers

    What is the relationship between pitch and table travel per rotation in helical CT scans?

    <p>Pitch = table travel / beam width</p> Signup and view all the answers

    What is the mathematical process that allows reconstruction of an image at any z-axis position?

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

    What is the primary challenge faced by conventional reconstruction algorithms when dealing with helical CT data?

    <p>The X-ray source travels in a helical trajectory around the patient.</p> Signup and view all the answers

    What is the purpose of the interpolation algorithm in helical CT scanning?

    <p>To convert the helical data set into a series of planar image data sets.</p> Signup and view all the answers

    Why is data interpolation necessary during helical CT image reconstruction?

    <p>The image plane does not contain enough data for direct reconstruction.</p> Signup and view all the answers

    What is the result of the interpolation process in helical CT scanning?

    <p>A series of planar image data sets in the reconstruction plane of interest.</p> Signup and view all the answers

    What is the difference between interpolation and extrapolation?

    <p>Interpolation estimates values between known data points, while extrapolation estimates values beyond the range of known data points.</p> Signup and view all the answers

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