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[Evaluation for Resolution Property of CT Image with Half-reconstruction Algorithm].

Norisato Tsuda1, Kota Mitsui1, Shinichiro Oda1

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Nihon Hoshasen Gijutsu Gakkai Zasshi
|August 23, 2019
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Summary

Half-reconstruction computed tomography (CT) images show similar XY-plane resolution to full-reconstruction CT images. Resolution depends on X-ray tube position, particularly in the tangential direction for half-reconstruction CT.

Keywords:
computed tomography (CT)half-reconstruction algorithmmodulation transfer function (MTF)resolution property

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Area of Science:

  • Medical Imaging
  • Radiology
  • Image Reconstruction

Background:

  • Computed tomography (CT) is a crucial diagnostic tool.
  • Image reconstruction algorithms impact diagnostic quality.
  • Assessing resolution properties is vital for CT performance evaluation.

Purpose of the Study:

  • To evaluate the XY-plane resolution of half-reconstruction CT images.
  • To compare the resolution of half-reconstruction CT with full-reconstruction CT.
  • To measure 360° multi-directional modulation transfer functions (MTFs) for resolution assessment.

Main Methods:

  • Measured 360° multi-directional MTFs using a wire method at 15° intervals.
  • Acquired MTFs for half-reconstruction CT at off-center positions (±100 mm on X and Y axes).
  • Compared MTFs between half- and full-reconstruction CT images, including variations with X-ray tube positions.

Main Results:

  • Significant differences in MTFs were observed between tangential and radial directions for half-reconstruction CT.
  • Resolution property dependencies on position and direction were similar for both half- and full-reconstruction CT.
  • MTFs at X+100 mm were higher/lower for half-reconstruction CT depending on the X-ray tube's projection dataset side (+X/-X).

Conclusions:

  • Half-reconstruction CT images exhibit comparable XY-plane resolution to full-reconstruction CT images.
  • The resolution of half-reconstruction CT, specifically MTF in the tangential direction, is influenced by the X-ray tube position in the projection dataset.