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<p>The quasi-monochromatic, continuously energy-tunable, and high-brightness gamma rays that are produced by an inverse Compton scattering (ICS) light source provide an ideal probe for gamma-ray imaging. However, owing to the influence of the intrinsic energy-angle correlation spectrum of this type of light source, monochromatic computed tomography (CT), especially in the gamma-ray energy region, can only be realized in a low-efficiency manner, similar to first-generation CT. A dual-energy scan scheme with a large imaging field of view (FOV) was developed in this study to improve the imaging efficiency. The effectiveness of this scheme was demonstrated based on the beam parameters of a typical ICS light source using Monte Carlo simulations. By leveraging the principle of basis material decomposition, the influence of the energy-angle correlation spectrum on CT reconstruction was corrected, and a monochromatic CT image of the imaging object was accurately reconstructed. Furthermore, the electron density and effective atomic number of the imaging object could be obtained simultaneously.</p>

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An effective method toward large field-of-view gamma-ray computed tomography based on an inverse Compton scattering light source

  • 期刊论文

  • 发表日期：

    2026年3月12日

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  • Zhi-Jun Chi,
  • Hong-Ze Zhang,
  • Jia-Yi Sun,
  • Hao Ding,
  • Jin Lin,
  • Xuan-Qi Zhang,
  • Qi-Li Tian,
  • Zhi Zhang,
  • Ying-Chao Du,
  • Wen-Hui Huang,
  • Chuan-Xiang Tang

摘要

The quasi-monochromatic, continuously energy-tunable, and high-brightness gamma rays that are produced by an inverse Compton scattering (ICS) light source provide an ideal probe for gamma-ray imaging. However, owing to the influence of the intrinsic energy-angle correlation spectrum of this type of light source, monochromatic computed tomography (CT), especially in the gamma-ray energy region, can only be realized in a low-efficiency manner, similar to first-generation CT. A dual-energy scan scheme with a large imaging field of view (FOV) was developed in this study to improve the imaging efficiency. The effectiveness of this scheme was demonstrated based on the beam parameters of a typical ICS light source using Monte Carlo simulations. By leveraging the principle of basis material decomposition, the influence of the energy-angle correlation spectrum on CT reconstruction was corrected, and a monochromatic CT image of the imaging object was accurately reconstructed. Furthermore, the electron density and effective atomic number of the imaging object could be obtained simultaneously.