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Longitudinal sampling and aliasing in spiral CT.

S Y Yen1, C H Yan, G D Rubin

  • 1Department of Electrical Engineering, Stanford University, Stanford, CA 94305, USA.

IEEE Transactions on Medical Imaging
|April 8, 1999
PubMed
Summary
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Longitudinal aliasing in spiral computed tomography (CT) is significant, especially away from the scanner

Area of Science:

  • Medical Imaging
  • Radiological Physics

Background:

  • In-plane aliasing in conventional computed tomography (CT) is understood.
  • Longitudinal aliasing in spiral CT remains under-investigated.

Purpose of the Study:

  • To develop a mathematical model for spiral CT's 3-D sampling scheme.
  • To analyze the impact of this scheme on longitudinal aliasing.

Main Methods:

  • Mathematical modeling of spiral CT sampling.
  • CT simulations and phantom scans.
  • Analysis of helical-interpolation algorithms, pitch, and reconstruction interval.

Main Results:

  • Spiral CT sampling causes spatially varying longitudinal aliasing.
  • Aliasing is minimal at the isocenter but increases with distance.

Related Experiment Videos

  • Model predictions align with existing isocenter data and offer new off-isocenter insights.

    • Conclusions:

    • Longitudinal aliasing is significant at off-isocenter locations in spiral CT.
    • Isocenter measurements do not predict off-isocenter aliasing magnitude or effects.