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An experimental method to correct low-frequency concentric artifacts in photon counting CT.

Mang Feng1, Xu Ji1, Ran Zhang1

  • 1Department of Medical Physics, University of Wisconsin-Madison, 1111 Highland Avenue, Madison, WI 53705, United States of America.

Physics in Medicine and Biology
|July 27, 2021
PubMed
Summary

This study introduces a new method to fix concentric artifacts in photon-counting detector CT (PCD-CT) images. The technique uses pixel-specific functions to improve image quality for large objects, reducing artifacts and noise.

Keywords:
CT image artifactsCT image qualityphoton counting CT

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Area of Science:

  • Medical Imaging
  • Detector Physics
  • Image Processing

Background:

  • Photon-counting detector CT (PCD-CT) uses tiled semiconductor panels with varying spectral responses, causing artifacts in large object scans.
  • Existing methods fail to correct low-frequency concentric artifacts in human-sized PCD-CT images due to their wide bands.

Purpose of the Study:

  • To develop and experimentally validate a novel method for correcting concentric artifacts in PCD-CT images.
  • To address spectral inconsistencies across detector panels in large-area PCDs.

Main Methods:

  • A pixel-specific polynomial function approach was developed, adapting a two-step beam hardening correction.
  • Calibration involved using acrylic and aluminum sheets to determine pixel-specific coefficients.
  • The method converts projection data to energy-independent equivalent thicknesses.

Main Results:

  • The proposed method effectively removed low-frequency concentric artifacts in PCD-CT images of a human cadaver head and phantoms.
  • It also reduced beam hardening artifacts, outperforming conventional ring correction algorithms.
  • Compared to material decomposition, it requires fewer energy bins and yields lower noise.

Conclusions:

  • The pixel-specific polynomial method offers a robust solution for concentric artifact correction in PCD-CT.
  • It enhances image quality for large-object imaging, applicable to various PCD configurations.
  • This technique improves upon existing methods by reducing artifacts and noise.