CT理论与应用研究2025，Vol.34Issue(2)：225-234,10.DOI:10.15953/j.ctta.2024.236
基于散射校正板和ADMM算法的锥束CT散射校正
CT Scatter Correction Based on Beam-hole Array and ADMM Algorithm
摘要
Abstract
In cone-beam computed tomography(CT)systems,scatter signals can result in artifacts in images,thus adversely affecting image quality by reducing the contrast and signal-to-noise ratio.To accurately estimate and suppress scatter artifacts,a new scatter-correction method for cone-beam CT based on a beam-hole array(BHA)scatter-correction plate and the alternating direction method of multipliers(ADMM)are proposed.Based on the correction principle of the BHA scatter-correction plate,the plate is placed between the object under test and the detector during scanning.This setup captures projection data and computes scatter signals at the centers of the beam holes.Simultaneously,by incorporating the theory of compressed sensing,an L1-norm constrained model is established,and the ADMM is utilized to obtain a complete scatter-field distribution.Using an interpolation algorithm to scan angles reduces the time required for a full-angle reconstruction of the scatter field.Post-scatter removal and reconstruction yield scatter-corrected CT images.Data analysis of the reconstructed slices reveals the image quality,which indicates that the scatter-correction method based on the BHA plate effectively enhances the image contrast and reduces scatter artifacts.The improved scatter-signal reconstruction method further increases the accuracy of scatter-signal estimation,thus rendering scatter suppression more pronounced.Furthermore,using scanning-angle interpolation algorithms improves the efficiency of scatter-field reconstruction.The combined use of BHA and ADMM provides better scatter removal and further improvement in image quality.关键词
CT/散射校正板/散射校正/ADMM算法Key words
CT/beam hole array/scatter correction/alternating direction method of multipliers分类
信息技术与安全科学引用本文复制引用
赵浩翔,赵晓杰,陈平,魏交统..基于散射校正板和ADMM算法的锥束CT散射校正[J].CT理论与应用研究,2025,34(2):225-234,10.基金项目
国家自然科学基金(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(U23A20285) （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(U23A20285）
面向航发叶片残芯影像表征的X射线多谱CT成像方法研究(62301508) （62301508）
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)) （62201520）
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(2023YFE0205800)) （半导体器件封装质量智能检测关键技术研究与应用示范(2023YFE0205800）
山西省自然科学基金(面向碳封存的煤岩盖层孔隙结构X射线多谱CT多尺度表征方法(202203021222052)). （面向碳封存的煤岩盖层孔隙结构X射线多谱CT多尺度表征方法(202203021222052）
