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Physics-based spectral compensation algorithm for x-ray CT with primary modulator.

Hewei Gao1,2,3, Li Zhang1,2, Rainer Grimmer4

  • 1Department of Engineering Physics, Tsinghua University, Beijing 100084, People's Republic of China.

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|April 19, 2019
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This study introduces a spectral compensation algorithm to fix ring artifacts in X-ray computed tomography (CT) caused by primary modulators. The new method significantly reduces image nonuniformity, improving CT image quality for practical applications.

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Area of Science:

  • Medical Imaging
  • Physics
  • Computer Science

Background:

  • X-ray computed tomography (CT) scatter correction is crucial for image quality.
  • Primary modulator techniques have advanced scatter correction.
  • Spectral nonuniformity from modulators causes challenging ring artifacts.

Purpose of the Study:

  • To develop a physics-based spectral compensation algorithm for X-ray CT.
  • To adaptively correct spectral nonuniformity introduced by primary modulators.
  • To reduce ring artifacts and improve CT image quality.

Main Methods:

  • Modeled initial X-ray CT spectrum using physics principles and expectation maximization.
  • Calculated effective modulator thickness from transmission measurements.
  • Generated beam hardening correction using modulator-modeled spectra.

Main Results:

  • The spectral compensation algorithm effectively removed ring and band artifacts in phantom scans.
  • CT number nonuniformity was reduced from over 600 HU to under 14 HU with different modulators.
  • Significant suppression of ring artifacts was observed in anthropomorphic thorax phantom images.

Conclusions:

  • The proposed algorithm successfully corrects spectral nonuniformity caused by primary modulators.
  • This technique substantially reduces artifacts, enhancing the diagnostic value of CT images.
  • The method offers a practical solution for improving X-ray CT imaging.