双能CT对不同部位金属植入物伪影去除的应用价值  

Application value of dual-energy CT in removing artifacts of metal implants in different parts

作　　者：陈诗飞 吴慧钊[1] 张平[1] 白琳 王明 张冉旭 王亚丽[1] CHEN Shifei;WU Huizhao;ZHANG Ping;BAI Lin;WANG Ming;ZHANG Ranxu;WANG Yali(Department of Radiology,the Third Hospital of Hebei Medical University,Shijiazhuang 050031,China)

机构地区：[1]河北医科大学第三医院放射科,河北石家庄050031

出　　处：《实用放射学杂志》2024年第11期1888-1891,共4页Journal of Practical Radiology

基　　金：青年科技课题(20230087)。

摘　　要：目的探讨双能CT对人体不同部位、不同金属植入物造成的金属伪影去除情况,筛选最佳去金属伪影方法。方法对43例金属植入物患者进行双能CT扫描,重组图像获得常规影像(CI)、120 keV、140 keV、160 keV、180 keV、200 keV、骨科金属伪影减少算法(O-MAR)、200 keV+O-MAR 8组影像数据。根据不同keV单能影像随伪影指数(AI)值的变化趋势及主观评价,筛选最佳的能谱单能影像。采用单因素方差分析比较不同组别的客观图像评价指标及影像质量主观评价。使用组内相关系数(ICC)评价不同观察者影像质量主观评价一致性和可靠性。结果不同keV单能影像AI值随着keV增加呈下降趋势,200 keV水平的虚拟单能影像AI值最小。各组对高密度伪影,低密度伪影去除情况的客观指标值差异均有统计学意义(P<0.05),两两比较显示CI和O-MAR、CI和O-MAR+200 keV、200 keV和O-MAR、200 keV和O-MAR+200 keV均有统计学差异(P<0.05),其中O-MAR+200 keV客观指标显示最好。主观评价不同观察者的ICC为0.97%,观察者内的ICC为0.91%,各组间的影像主观评分差异有统计学差异(P<0.05),其中CI的评分最低[(1.04±0.24)分],O-MAR+200 keV组合评分最高[(4.57±0.78)分]。结论双能CT虚拟单能200 keV能谱结合O-MAR技术可作为去除金属植入物伪影和获得较好假体周围软组织对比度的最佳技术。Objective To investigate the removal of metal artifacts caused by different metal implants in different parts of the human body using dual-energy CT and to select the best method for metal artifacts reduction.Methods Forty-three patients with metal implants underwent dual-energy CT scans.Reconstructed images were obtained to produce eight sets of imaging data:conventional image(CI),120 keV,140 keV,160 keV,180 keV,200 keV,Orthopedic metal artifact reduction algorithm(O-MAR),200 keV+O-MAR.The optimal spectral monoenergetic images was selected based on the trend of changes in artifact index(AI)values with different keV monoenergetic images and subjective evaluation.One-way ANOVA was used to analyze and compare objective image evaluation indicators and subjective evaluations of image quality among different groups.The intraclass correlation coefficient(ICC)was used to evaluate the consistency and reliability of subjective evaluations of image quality among different observers.Results The AI values of different keV monoenergetic images showed a decreasing trend with increasing keV,and the virtual monoenergetic images at the 200 keV level had the smallest AI value.There were statistically significant differences in objective indicators for the removal of high-density artifacts and low-density artifacts among the groups(P<0.05).Pairwise comparison showed statistical differences between CI and O-MAR,CI and O-MAR+200 keV,200 keV and O-MAR,200 keV and O-MAR+200 keV(P<0.05),with O-MAR+200 keV demonstrating the best objective indicators.The ICC for subjective evaluation among different observers was 0.97%,and the ICC within observers was 0.91%.There were statistically significant differences in subjective image scores among the groups(P<0.05),with the CI had the lowest score[(1.04±0.24)points]and the O-MAR+200 keV combination had the highest score[(4.57±0.78)points].Conclusion Dual-energy CT virtual monoenergetic 200 keV spectroscopy combined with O-MAR technique can be used as the best technique for removing metal implant

关 键 词：双能CT 金属伪影 金属植入物 影像分析 

分 类 号：R814.42[医药卫生—影像医学与核医学] R622[医药卫生—放射医学]