CT理论与应用研究2025，Vol.34Issue(5)：830-838,9.DOI:10.15953/j.ctta.2024.222
基于FDK补偿项与双光源加权的锥束CT伪影抑制方法
Suppression Method for Cone-Beam CT Artifact Based on FDK Compensation and Dual-Source Weighting
摘要
Abstract
The Feldkamp-Davis-Kress(FDK)algorithm has the advantages of a simple structure,fast calculation speed,and high reconstruction quality,and it remains the mainstream algorithm for cone-beam computed tomography(CBCT)analytical reconstruction.However,if the cone angle for the reconstructed point is too large,the reconstruction exhibits artifacts characterized by an axial density drop.Numerous methods for suppressing this artifact have been proposed,including projection weighting,cone-beam rebinning,and introducing compensation terms.The compensation method has high computational efficiency and achieves good artifact suppression when the cone angle is over ten degrees.However,for cases with larger cone angles,the effectiveness of this algorithm is diminished.Thus,further optimization of the reconstruction algorithms and scanning geometry is required to accommodate industrial and clinical demands.Based on the two compensation terms for FDK reconstruction,this study extends cone-beam CT geometrically to the case of dual source in the z-direction distribution,further suppressing cone-beam artifacts by reducing the average cone angle of the reconstructed points.A cone-angle weighting method is proposed for dual-source reconstruction,to fuse the reconstructed results of the two sources and obtain the final reconstructed image.Simulation results show that the proposed algorithm can improve the quality of the reconstructed image more effectively than single-source case.关键词
FDK/锥束伪影/双光源加权Key words
FDK/cone-beam artifact/dual-source weighting分类
信息技术与安全科学引用本文复制引用
向荣林,张丽..基于FDK补偿项与双光源加权的锥束CT伪影抑制方法[J].CT理论与应用研究,2025,34(5):830-838,9.基金项目
国家自然科学基金重点项目(融合动态能谱与个性化建模的冠状动脉容积成像方法与关键技术重点项目(62031020)). （融合动态能谱与个性化建模的冠状动脉容积成像方法与关键技术重点项目(62031020）
