CT理论与应用研究2025，Vol.34Issue(4)：571-579,9.DOI:10.15953/j.ctta.2025.064
基于积分不变性的CT图像硬化伪影校正方法
A Correction Method for Hardening Artifacts in CT Images Based on Integral Invariance
摘要
Abstract
In conventional computed tomography(CT)systems,X-ray beams used for imaging are polyenergetic.These beams cause hardening artifacts in the reconstructed images owing to their polychromatic nature.For a multi-material imaging object,prior information about the X-ray spectrum and composition of the imaging object is required for correcting the beam hardening.To avoid relying on such prior information,this study proposes a beam-hardening artifact correction method for CT imaging of multi-material objects under single voltage.In this method,the X-ray image is considered as a non-negative weighted sum of multiple single-energy X-ray images.The decomposition model for the X-ray transmission images is constructed using the maximum likelihood function of a Gaussian distribution as the objective function under the constraint of the projection integral invariance at different angles.To solve this model,the projection of the spatial terms on the X-ray path is obtained.Thus,CT images for X-ray beams with different energies can be reconstructed.For imaging experiments with dual-material and multi-material models,compared with directly reconstructed CT images,the hardening artifacts in the reconstructed images were significantly reduced using this method,indicating its effectiveness.关键词
单电压/积分不变性/硬化伪影校正/无先验/多材料Key words
single voltage/integral invariance/beam hardening correction/without prior information/multi-materials分类
信息技术与安全科学引用本文复制引用
刘宇欣,魏交统,赵晓杰,陈平,潘晋孝..基于积分不变性的CT图像硬化伪影校正方法[J].CT理论与应用研究,2025,34(4):571-579,9.基金项目
国家重点研发计划(半导体器件封装质量智能检测关键技术研究与应用示范(2023 YFE0205800)) （半导体器件封装质量智能检测关键技术研究与应用示范(2023 YFE0205800）
国家自然科学基金(基于X射线投影图像盲分离的预设能量CT成像算法研究(62201520) （基于X射线投影图像盲分离的预设能量CT成像算法研究(62201520）
面向黄土质煤岩层孔裂隙结构动态表征的宽视场高分辨动态CT成像研究(U23 A20285) （U23 A20285）
面向航发叶片残芯影像表征的X射线多谱CT成像方(62301508)). （62301508）
