基于宽体探测器高分辨率扫描模式下的多种不同重建算法对冠状动脉支架可视化评估对比研究  

Comparison of Different Reconstruction Algorithms for Visual Evaluation of Coronary Stents Using the Whole-Organ High-Definition CT Scanner

作　　者：王莹[1] 王奇政 陈永晔 狄爱辉 张艳[1] WANG Ying;WANG Qizheng;CHEN Yongye;DI Aihui;ZHANG Yan(Department of Radiology,Peking University Third Hospital,Beijing 100191,China)

机构地区：[1]北京大学第三医院放射科,北京100191

出　　处：《中国医学计算机成像杂志》2022年第4期433-438,共6页Chinese Computed Medical Imaging

摘　　要：目的:使用宽体探测器高分辨率CT对冠状动脉支架进行成像,并进行4种不同重建方式的重建,评估经皮冠状动脉介入治疗(PCI)术后患者腔内支架的可视化程度。方法:对连续的37例PCI术后患者,使用宽体探测器高分辨率CT行冠状动脉CT血管成像(CTA),采用高清扫描模式,并用4种不同重建算法进行图像重建,包括标准(stnd)算法,细节(detail)算法、高清标准(HD-stnd)和高清细节(HD-detail)算法,对植入支架血管进行图像后处理,获得血管拉直图像以及相应部位的血管垂直横断面图像,对图像进行客观评价(包括支架后冠脉内腔直径、噪声、晕状伪影)和主观图像质量评分(Likert4级评分法),结果采用重复测量方差分析进行比较,P<0.05为差异具有统计学意义。结果:使用HD-detail和HD-stnd重建算法图像的测量支架后冠脉内腔直径均大于其他重建算法,HD-detail和HD-stnd重建算法图像的晕状伪影均小于其他重建算法,HD-detail重建算法图像的噪声最大,HD-detail和HD-stnd重建算法主观图像质量评分高于其他重建算法,差异具有统计学意义(P<0.05)。结论:采用宽体探测器高分辨率CT结合高分辨率扫描模式对冠状动脉支架进行成像,并使用高清重建(HD-detail和HD-stnd)算法,能够提高冠状动脉支架内管腔情况的可视化程度,为PCI术后患者的随访观察提供更加精准的依据。Purpose:To evaluate the visualization of coronary stents with four different reconstruction algorithms in the whole-organ high-definition CT scanner.Methods:Thirty-seven patients after stenting underwent coronary computed tomography angiography(CTA)with high-definition scanning mode in a whole-organ high-definition CT scanner.Four different reconstruction algorithms(stnd,detail,HD-stnd,HD-detail)were applied to reconstruct the images of the stented coronary artery.The objective image quality score included the intrastent luminal diameter,noise and blooming artifact,and the Likert 4 point scale was performed to evaluate subjective image quality score.Differences of objective and subjective parameters of different reconstruction algorithms were compared by repeated measurement variance analysis,P-value<0.05 was considered statistically significant.Results:The intrastent luminal diameter using HD-detail and HD-stnd was larger than the other reconstruction algorithms.The blooming artifact of the images using HD-detail and HD-stnd were smaller than that of other reconstruction algorithms.The noise of the images using HD-detail was the largest.The subjective image quality score using HD-detail and HD-stnd was larger than the other reconstruction algorithms.The difference was with statistical significance(P<0.05).Conclusions:The whole-organ high-definition CT scanner can be used to improve the visualization of coronary stents by the highdefinition scanning mode with HD-detail and HD-stnd reconstruction algorithms,and provide more accurate basis for follow-up observation of patients after PCI.

关 键 词：冠状动脉支架 宽体探测器 高分辨率CT 高清重建算法 

分 类 号：R445.3[医药卫生—影像医学与核医学]