能谱CT单能量成像联合去金属伪影算法可减少颅内动脉瘤栓塞术后伪影  

Spectral CT monochromatic imaging combined with metal artifact removal algorithm can reduce artifacts after intracranial aneurysm embolization

作　　者：陈宗桂 肖瑶 钟志明 唐琦 曹湘玉 黄民江 CHEN Zonggui;XIAO Yao;ZHONG Zhiming;TANG Qi;CAO Xiangyu;HUANG Minjiang(Medical College,Hunan University of Medicine,HuaiHua 418000,China;Department of Radiology,Guangxi International Zhuang Medicine Hospital,Nanning 530201,China)

机构地区：[1]湖南医药学院医学院,湖南怀化418000 [2]广西国际壮医医院放射科,广西南宁530201

出　　处：《分子影像学杂志》2025年第2期229-234,共6页Journal of Molecular Imaging

基　　金：湖南省自然科学基金联合项目(2024JJ7334);湖南省教育厅一般项目(22C1183);湖南省大学生创新训练计划一般项目(5925)。

摘　　要：目的探讨能谱CT单能量成像联合去金属伪影算法在减少颅内动脉瘤弹簧圈栓塞术后金属伪影的应用价值。方法收集2023年6月~2024年8月湖南医药学院总医院48例颅内动脉瘤栓塞术后需行能谱头颈CT检查患者的原始数据,分别重建出40~140 keV单能级图像、140 kVp混合能量图像及40~140 keV联合去金属伪影算法重建的图像。选择受伪影影响的脑组织区域作为实验组,不受伪影影响的脑组织区域作为对照组,测量CT值及标准差,计算该区域的伪影指数及信噪比;由2名诊断医生采用Likert 5分量表法对金属伪影严重程度及周围组织的清晰度进行主观评分。结果伪影指数随着单能级的增加逐渐降低,信噪比逐渐增高。在相同的keV条件下,单能量联合去除金属伪影算法组的伪影指数低于单能量组,差异有统计学意义(P<0.05);单能量联合去除金属伪影算法组的信噪比高于单能量组,差异有统计学意义(P<0.05)。在能级100~140 keV时,单能量联合去除金属伪影算法组的信噪比达到最高且趋于稳定,而伪影指数达到最低且趋于稳定。相同keV下,单能量联合去除金属伪影算法组的主观评分均更高,差异有统计学意义(P<0.05)。结论能谱CT单能量成像联合去金属伪影算法有效减少了颅内动脉瘤栓塞术后金属伪影,优化血管显示,提高图像质量。Objective To explore the application value of energy spectrum CT monochromatic imaging combined with metal artifact removal algorithm in reducing metal artifacts after intracranial aneurysm coil embolization.Methods The original data of 48 patients who needed spectral head and neck CT examination after intracranial aneurysm embolization were collected in Hunan University Of Medicine General Hospital from June 2023 to August 2024.The 40-140 keV monochromatic image,140 kVp mixed-energy image and 40-140 keV combined with metal artifact reduction algorithm were reconstructed from the original data respectively.In terms of objective analysis,the brain tissue regions affected by artifacts were selected as the experimental group,and brain tissue regions unaffected by artifacts were selected as the control group;CT values and standard deviations were measured,and artifact indices and signal-to-noise ratios were calculated for the regions;In terms of subjective analysis,two diagnostic doctors used the Likert 5-point scale to subjectively score the severity of metal artifacts and the clarity of surrounding tissues.Results The artifact index decreases gradually and the signal-to-noise ratio increases gradually as the single energy level increases.The artifact index of the single-energy combined metal artifact removal algorithm group was lower than that of the single-energy group under the same keV condition,and the difference was statistically significant(P<0.05).The signal-to-noise ratio of the single-energy combined metal artifact removal algorithm group was higher than that of the single-energy group under the same keV condition,and the difference was statistically significant(P<0.05).The signal-to-noise ratio of the single-energy combined metal artifact removal algorithm group reached the highest and stabilized,while the artifact index reached the lowest and stabilized at energy levels 100-140 keV.In terms of subjective evaluation,the subjective scores of the single-energy combined metal artifact removal algorithm group

关 键 词：颅内动脉瘤 去金属伪影技术 单能量成像 金属伪影 能谱CT 

分 类 号：R816.1[医药卫生—放射医学] R743[医药卫生—临床医学]