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A practical and robust method for beam blocker-based cone beam CT scatter correction.

Hehe Cui1, Xiao Jiang1, Wei Tang2

  • 1Department of Engineering and Applied Physics, University of Science and Technology of China, Hefei, Anhui, 230026 People's Republic of China.

Physics in Medicine and Biology
|January 12, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces an improved scatter correction method for cone beam CT (CBCT) using a beam-blocker. The new technique simplifies scatter estimation, reducing CT number errors in phantom imaging.

Keywords:
beam blockercone beam CTscatter correction

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Area of Science:

  • Medical Imaging
  • Radiological Physics
  • Computational Imaging

Background:

  • Cone beam CT (CBCT) imaging is susceptible to scatter radiation, which degrades image quality.
  • Traditional scatter correction methods using beam-blockers require tedious optimization of correction factors.
  • A need exists for a more efficient and objective scatter correction method in CBCT.

Purpose of the Study:

  • To develop and validate an indirect scatter estimation method for beam-blocker based CBCT scatter correction.
  • To eliminate the need for optimization of correction factors in CBCT scatter correction.
  • To improve the accuracy and robustness of CBCT imaging.

Main Methods:

  • An indirect scatter estimation method using a beam-blocker with lead strips was developed.
  • Primary signal was calculated by subtracting measured scatter, then used to estimate scatter in unblocked regions.
  • Scatter signals were smoothed and applied for projection correction; CBCT was reconstructed using the Feldkamp-Davis-Kress algorithm.

Main Results:

  • CT number errors were significantly reduced in phantom studies with the proposed method.
  • Without a bow-tie filter, errors were reduced to 3.97±2.27 HU (Catphan, full-blocker) and 4.01±2.18 HU (head phantom, full-blocker).
  • With a bow-tie filter, errors were further reduced to 2.29±1.42 HU (Catphan, full-blocker) and 2.35±1.25 HU (head phantom, full-blocker).

Conclusions:

  • The proposed indirect scatter estimation method effectively corrects scatter in CBCT without tedious optimization.
  • This method avoids self-influence from the beam blocker on scatter estimation.
  • It offers a practical and robust solution for beam-blocker based scatter correction in CBCT.