心脏CT重建时相对冠状动脉钙化积分危险分级的影响

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...

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

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 (R²=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.