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<p>The energy response of an imaging detector based on a monolithic crystal is highly dependent on the position of the gamma-ray interaction, which leads to a spectral drift of the imaging detector, known as the spectral drift related to incident position. This deteriorates the energy resolution of the detector and affects the selection of the energy window for imaging, resulting in artifacts in the reconstructed image. Thus, an energy-response correction method was proposed to improve the positional consistency of the detector-energy response. In both&#xa0;the simulation and physical experiments, the method improved the full-energy peak consistency of the monolithic crystal detector, which improved the energy resolution of the detector, led to more accurate selection of the energy window, and improved imaging quality. In particular, in physical experiments after correction, the peak sites converged to 365&#xa0;keV at each location, which reduced the full width at half maximum (FWHM) of the characteristic peak (@365&#xa0;keV) from 53 to 38 channels, and improved the energy resolution by 28.3%. Moreover, the incomplete mask was transformed into a complete mask projection, and the signal-to-noise ratio increased from 2.38 to 5.37.</p>

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Energy-response correction for imaging detectors based on monolithic crystals

  • 期刊论文

  • 发表日期：

    2026年4月11日

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  • Hao-Xuan Li,
  • Lei Wang,
  • Yu-Kun Du,
  • Meng-Lei Chen,
  • Wei Lu,
  • Ze-Xi Wang

摘要

The energy response of an imaging detector based on a monolithic crystal is highly dependent on the position of the gamma-ray interaction, which leads to a spectral drift of the imaging detector, known as the spectral drift related to incident position. This deteriorates the energy resolution of the detector and affects the selection of the energy window for imaging, resulting in artifacts in the reconstructed image. Thus, an energy-response correction method was proposed to improve the positional consistency of the detector-energy response. In both the simulation and physical experiments, the method improved the full-energy peak consistency of the monolithic crystal detector, which improved the energy resolution of the detector, led to more accurate selection of the energy window, and improved imaging quality. In particular, in physical experiments after correction, the peak sites converged to 365 keV at each location, which reduced the full width at half maximum (FWHM) of the characteristic peak (@365 keV) from 53 to 38 channels, and improved the energy resolution by 28.3%. Moreover, the incomplete mask was transformed into a complete mask projection, and the signal-to-noise ratio increased from 2.38 to 5.37.