切片厚度伪像造成穿室间隔血流成因的分析

Analysis on blood flow through ventricular septum caused by slice-thickness artifact in echocardiography

目的研究切片厚度伪像在超声心动图检查中造成穿室间隔血流的原因，为避免临床误判或误诊提供临床试验依据。方法使用不同型号的超声诊断仪对50例无室间隔缺损者行超声心动图检查，观察图像中出现穿室间隔血流的切面观、条件和所使用的仪器之间的关系。结果8例受检者在使用特定超声诊断仪检查时于胸骨旁四腔观或胸骨旁不规则观可见穿室间隔血流。其余42例在使用不同超声诊断仪检查时均未出现穿室间隔血流。多切面动态扫查结合解剖学分析可推断穿室间隔血流为后房室沟内走行的冠状血管。结论无室间隔缺损的正常人出现穿室间隔血流伪像是由于冠状血管内的彩色血流信号与室间隔重叠所致，是切片厚度伪像在心脏超声的一种表现。

Objective To investigate the source of the blood flow through ventricular septum in normal subject caused by slice thickness artifact in echocardiography. Methods Echoeardiography was performed in 50 normal subjects without ventricular septum defect by two models of eehocardiography unit equipped with two models of transducer, observing the conditions and sections in which the blood flow through ventricular septum could be detected. Results The blood flow through ventrieular septum was detected in 8 normal subjects using the certain model of echocardiography unit,especially in parasternal four chambers section and parasternal irregular sections,while the blood flow through ventricular septum wasn＇t detected in the other 42 subjects by any eehocardiography unit. The blood flow through ventricular septum was caused by coronary vessel in atrioventricular groove proved by combining dynamic observation with anatomy analysis. Conclusions The blood flow through ventrieular septum in normal subjects, a kind of slice-thickness artifact in echoeardiography, is caused by coronary vessel in atrioventrieular groove mapped into intact ventricular septum.