心脏CT重建时相对冠状动脉钙化积分危险分级的影响  

Impact of cardiac CT reconstruction time interval on risk stratification of coronary artery calcium scoring

作　　者：汤化民[1] 苟杰[1] 林伟[1] 银文杰[1] 杨帆[1] 张波莉[1] 贺倩[1] TANG Huamin;GOU Jie;LIN Wei;YIN Wenjie;YANG Fan;ZHANG Boli;HE Qian(Department of Radiology,Chengdu First People's Hospital,Chengdu 610041,China)

机构地区：[1]成都市第一人民医院放射科,四川成都610041

出　　处：《中国医学影像技术》2021年第1期50-53,共4页Chinese Journal of Medical Imaging Technology

基　　金：四川省卫生健康委科技项目(18PJ139)。

摘　　要：目的观察心脏CT重建时相对冠状动脉钙化积分(CACS)危险分级的影响。方法对70名存在冠心病高风险因素的成人志愿者行心脏回顾性心电门控多时相重建,观察以5%为间隔重建的11个时相CACS、最佳舒张及收缩期时相CACS及心率相关指标,对比不同时相CACS危险分级,以多因素岭回归分析分级与各指标间相关性。结果系统自识别最佳收缩或舒张期判断4名受检者存在CACS跨级。22名受检者不同人工重建时相CACS存在危险分级跨级,结果重复性不佳;9个时相跨级者平均CACS明显低于无跨级者(P均<0.05)。心率相关指标与CACS分级的相关性差(R 2=0.123)。结论心脏CT不同重建时相CACS结果存在一定差异,自身结果重复性不佳,危险分级存在跨级风险,可能与CACS无法准确反映不同时相心脏细微结构差异有关。Objective To observe the impact of reconstruction time interval on risk stratification coronary artery calcium score(CACS)of cardiac CT.Methods Totally 70 adult volunteers with high risk factors of coronary heart disease underwent retrospective ECG gated multi-phase CT reconstruction.CACS data of 11 time phases reconstructed at 5%interval,optimal diastolic and systolic phases of CACS and heart rate related indexes were observed.The risk grades of CACS were compared among different phases.Correlations of the grades and indexes were analyzed using multivariate ridge regression.Results Crossing grade of best systolic or diastolic CACS were automatically identified in 4 subjects by CT system,while 22 subjects were found with cross grade risk of CACS according to reconstructed images at different time,and the repeatability of the results was poor.The average CACS of subjects with 9 time phases crossing grade was significantly lower than that of those without crossing grade(P<0.05).The correlation of heart rate related indexes and CACS classification was poor(R 2=0.123).Conclusion CACS results of different reconstruction phases of cardiac CT were somehow changeable,the repeatability of one-self results was not ideal.There was a cross grade risk of risk classification,which might be related with that CACS could not accurately reflect differences of cardiac microstructure in different phases.

关 键 词：冠状动脉钙化积分 体层摄影术 X线计算机 

分 类 号：R541.4[医药卫生—心血管疾病] R814.42[医药卫生—内科学]