肺动脉旁彩色多普勒血流显像镜像伪差的形成机制及影响因素

Research on mechanism and influencing factors of mirror-image artifact of color Doppler flow beside pulmonary artery

摘要目的探讨纵向强回声大界面(LSEBI)发生彩色血流镜像伪差(MACBF)的发生机制及其影响因素。方法选取2018年11月至2019年4月于中国医科大学附属盛京医院行超声心动图检查,于主肺动脉旁及(或)左肺动脉旁出现MACBF的50例受试者作为研究对象,观察MACBF的图像特点,应用多普勒成像原理探讨存在LSEBI形成MACBF的发生机制及其影响因素。结果50例MACBF者中,单纯主肺动脉左侧旁36例,余14例MACBF同时出现在主肺动脉左侧旁及左肺动脉左侧旁。所有受试者MACBF均显示为正常部位真实彩色血流(RCBF)与MACBF间存在LSEBI,RCBF与MACBF呈镜像关系。主肺动脉左侧旁及左肺动脉左侧旁的LSEBI为左肺与胸膜界面。血流与LSEBI的距离近则MACBF信号强;彩色血流增益大则BACBF信号强。结论血管旁存在LSEBI时可发生MACBF;血流与LSEBI的距离及彩色血流增益均会影响MACBF的形成及伪差信号强度。

Objective To explore the mechanism and influencing factors of mirror-image artifact of color blood flow(MACBF)due to longitudinal strong echo big interface(LSEBI).Methods Fifty suspicious patients with MACBF beside the main pulmonary artery and/or the left pulmonary artery undergoing echocardiography examination from November 2018 to April 2019 in Shengjing Hospital of China Medical University were chosen as the subjects.Image characteristics of the MACBF were observed,and mechanism and influence factors of the MACBF were explored with Doppler imaging principle.Results Of all the subjects with MACBF,36 subjects occurred only on the left side of the main pulmonary artery,14 subjects occurred on both the left side of the main pulmonary artery and the left pulmonary artery.The LSEBI was found between the real color blood flow(RCBF)and the MACBF,there was a mirror relationship between the RCBF and the MACBF.The LSEBI on the left of the main pulmonary artery and the left pulmonary artery were the interface of the left lung and pleural.The signal strength of MACBF enhanced as the distance between the blood flow and the LSEBI got closer or the gain of the color blood flow got bigger.Conclusions MACBF may caused by LSEBI beside vessel.The formation of MACBF and its signal strength are influenced by the distance between blood flow and LSEBI and the gain of the color blood flow.