中国医学装备2026，Vol.23Issue(1)：50-53,4.DOI:10.3969/j.issn.1672-8270.2026.01.009
基于心排血指数的个性化触发延迟对下肢动脉CT血管造影的价值研究
Value of personalized trigger delay based on CI in lower limb artery CTA
摘要
Abstract
Objective:To assess the impact of personalized trigger delay technique based on cardiac index(CI)on imaging quality of computed tomography angiography(CTA)for lower limb artery.Methods:A total of 143 patients with lower limb ischemia who admitted to Harbin 242 Hospital from July 2022 to March 2025 were prospectively included.They were randomly divided into an observation group(72 cases)and a control group(71 cases)using a random number table method.The CTA scan of observation group adopted personalized trigger delay,and that of control group adopted the fixed trigger delay(25 s).The non-invasive cardiac output monitoring equipment(USCOM®)was adopted to measure CI,and to construct CI-contrast agent peak time(T)model to dynamically adjust CTA scanning phase.The differences of the excellent rate of image,contamination rate of vein,signal-to-noise ratio(SNR),and the excellent rate of image of patients at grade Ⅲ-Ⅳ of cardiac function grading between two groups were compared and analyzed.Results:The excellent rate of arterial imaging was 90.3％in the observation group,which was significantly higher than that(64.8％)of the control group.The contamination rate of vein was 8.3％in the observation group,which was significantly lower than that(29.6％)of the control group.The differences of the above two indicators between two groups were statistically significant(x2=15.2,11.8,P<0.01).The CT value and signal-to-noise ratio(SNR)of the femoral artery were respectively(320±45)HU and 25.3±4.1 in the observation group,which were significantly higher than those in the control group,and the differences of them between two groups were significant(t=-6.387,7.409,P<0.01).The excellent rate of images of patients at grade Ⅲ-Ⅳ of cardiac function grading in the observation group was 92.3％,which was better than that(53.8％)in the control group,and the difference was statistically significant(U=49.235,P<0.01).Conclusion:Personalized trigger delay technique can significantly optimize the quality of CTA imaging for lower limb by accurately matching personalized hemodynamic characteristics,which can provide safe and efficient CTA examination plan for lower limb artery of patients with cardiac dysfunction.关键词
心排血指数(CI)/下肢动脉/计算机体层扫描血管造影(CTA)/辐射剂量优化/触发延迟Key words
Cardiac index(CI)/Lower limb artery/Computed tomography angiography(CTA)/Optimization of radiation dose/Trigger delay分类
医药卫生引用本文复制引用
翟城弘,于洪涛,王锋,王伟,曹翼治,李涵玉..基于心排血指数的个性化触发延迟对下肢动脉CT血管造影的价值研究[J].中国医学装备,2026,23(1):50-53,4.基金项目
黑龙江省卫生健康委科研课题(20240909010478) Research Project of Heilongjiang Provincial Health Commission(202400909010478) （20240909010478）
