CT理论与应用研究2025，Vol.34Issue(2)：255-262,8.DOI:10.15953/j.ctta.2024.254
光子计数X射线CT能量成像精度影响因素分析
Analysis of Accuracy Related Factors in Photon Counting X-ray CT Energy Imaging
曹家晟 1李保磊1
作者信息
- 1. 北京航星机器制造有限公司,北京 100013
- 折叠
摘要
Abstract
Multi-energy spectrum imaging with photon counting detectors has become the focus of X-ray imaging.In this study,the Geant4 simulation software was used to generate the energy spectrum of the ray source,obtaining high-low energy spectra of different ranges by setting different detector energy resolutions and changing the energy threshold.High-low energy projection data of scan objects were obtained for dual-energy reconstruction.The standard deviation of the effective atomic number and electron density under each group were compared.The results show that the higher the energy resolution and the greater the difference between high and low energy spectra,the better is the imaging quality.The energy threshold influenced the imaging accuracy when the spectrum overlap ratio was changed.When the spectrum overlap became smaller and the spectral width became narrower,noise increased,making it necessary to balance the relationship between spectrum overlap and noise to achieve better imaging results.关键词
多能谱成像技术/光子计数探测器/X射线成像/计算机断层成像/双能重建Key words
multi-energy spectrum imaging/photon counting detector/X-ray imaging/CT/dual-energy reconstruction分类
信息技术与安全科学引用本文复制引用
曹家晟,李保磊..光子计数X射线CT能量成像精度影响因素分析[J].CT理论与应用研究,2025,34(2):255-262,8.
