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A novel scatter correction method for energy-resolving photon-counting detector based CBCT imaging.

Xin Zhang1,2, Heran Wang1,2, Yuhang Tan1

  • 1Research Center for Advanced Detection Materials and Medical Imaging Devices, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China.

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|September 25, 2025
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Summary

The e-Grid scatter correction method effectively reduces artifacts in photon-counting detector (PCD) based cone beam CT (CBCT) imaging. This technique significantly improves image quality by mitigating scatter shading in both low- and high-energy scans.

Keywords:
CBCT imagingphoton-counting detectorscatter

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Area of Science:

  • Medical Imaging
  • Photon-Counting Detector Technology
  • Cone Beam CT

Background:

  • High-quality CT imaging requires mitigation of scatter shading artifacts.
  • Energy-resolving photon-counting detector (PCD) based cone beam CT (CBCT) systems are susceptible to these artifacts.

Purpose of the Study:

  • To evaluate the e-Grid method for scatter correction in PCD CBCT.
  • To assess its capability in removing scatter shading artifacts.

Main Methods:

  • The e-Grid method uses a linear approximation between high- and low-energy signals from PCD energy windows.
  • Calibration experiments determined model parameters.
  • Physical validation was performed using head and abdominal phantoms on a PCD CBCT benchtop system.

Main Results:

  • The e-Grid method significantly eliminated scatter cupping artifacts in both low- and high-energy PCD CBCT images.
  • Scatter artifacts were reduced by over 70% across various object dimensions.

Conclusions:

  • The e-Grid method shows significant potential for scatter shading artifact reduction.
  • It is effective for energy-resolving PCD CBCT imaging.