混合迭代重建混合权重对心脏CT冠状动脉钙化积分影响  

Impact of hybrid iterative reconstruction blending weight on coronary artery calcium score based on cardiac CT

作　　者：张卓璐 刘卓[1] 洪楠[1] ZHANG Zhuo-lu;LIU Zhuo;HONG Nan(Department of Radiology,People's Hospital,Peking University,Beijing 100044,China)

机构地区：[1]北京大学人民医院放射科,北京100044

出　　处：《放射学实践》2021年第6期751-755,共5页Radiologic Practice

摘　　要：目的:评价混合迭代重建算法(ASIR-V)混合权重对心脏CT冠状动脉钙化积分及危险分层计算结果的影响。方法:100例心电门控心脏CT钙化积分扫描原始数据利用不同混合权重ASIR-V算法重建,包括ASIR-V 0%即(FBP)、 ASIR-V 20%、ASIR-V 40%、ASIR-V 60%、ASIR-V 80%、ASIR-V 100%。比较不同算法所得图像升主动脉CT值平均值及标准差、钙化斑块最大CT值、钙化积分(Agatston积分、质量积分、体积积分)及基于Agatston积分危险分层。结果:随ASIR-V混合权重提高升主动脉CT值平均值及冠脉钙化斑块最大CT值变化差异无统计学意义(P>0.05),升主动脉CT值标准差、3种钙化积分逐渐降低且差异有统计学意义(P<0.05)。Agatston积分分别为170.2±387.3、168.6±385.3、166.4±381.9、164.6±379.4、162.9±376.7、161.1±374.1(P=0.000)。质量积分分别为23.62±52.56、23.49±52.23、23.32±52.30、23.20±53.10、23.15±52.83、22.99±52.41mg(P=0.000)。体积积分分别为68.7±140.7、67.8±139.8、67.0±139.6、65.7±137.2、64.8±135.9、64.0±135.0mm^(3)(P=0.000)。ASIR-V导致10位受检者危险分层发生改变,其中8人从低危险降至极低危险,2人从中等危险降至低危险。结论:ASIR-V重建算法混合权重的提高可降低图像噪声水平,降低钙化积分,可能造成危险分层降低。Objectives:To investigate the impact of blending weight of hybrid iterative reconstruction(ASIR-V)on coronary artery calcium scores and risk stratification.Methods:In 100 patients,non-contrast ECG-gated cardiac CT images were reconstructed using different blending percentage of ASIR-V,including FBP(ASIR-V 0%),ASIR-V 20%,ASIR-V 40%,ASIR-V 60%,ASIR-V 80%,and ASIR-V 100%.Average and standard deviation(SD)of CT values in the ascending aorta,maximum value of plaque were compared among the weights.Agatston score,mass score,volume score and risk classification based on Agatston score were also compared.Results:An increased percentage of ASIR-V was associated with reduction in SD in the ascending aorta and three calcium scores(P<0.05),and no change in average value in the ascending aorta and plaque maximum value(P>0.05).Agatston scores were 170.2±387.3,168.6±385.3,166.4±381.9,164.6±379.4,162.9±376.7,and 161.1±374.1 for reconstructions with 0%,20%,40%,60%,80%and 100%ASIR-V,respectively(P=0.000).Mass scores were 23.62±52.56,23.49±52.23,23.32±52.30,23.20±53.10,23.15±52.83,and 22.99±52.41mg,respectively(P=0.000).Volume scores were 68.7±140.7,67.8±139.8,67.0±139.6,65.7±137.2,64.8±135.9,and 64.0±135.0mm 3,respectively(P=0.000).ASIR-V led to reclassification of risk to lower category in 10 patients,including 8 from low to very low,and 2 from moderate to low.Conclusion:ASIR-V results in image noise reduction,reduces calcium scores,and may result in risk reclassification to lower category.

关 键 词：图像处理 计算机辅助 体层摄影术 X线计算机 冠状动脉疾病 血管钙化 

分 类 号：R814.3[医药卫生—影像医学与核医学] R814.42[医药卫生—放射医学]