颈动脉横截面血流的彩色多普勒血液双层流动分析

Color Doppler Sonographic Study on Characteristics of Double-Strata Blood Flowing of Carotid Horizontal Section

目的探讨彩色多普勒超声进行颈动脉横截面血液流层特点及正常血液流层显像特征。方法健康志愿者126例,选用仪器为ToshibaSSA-340A彩色多普勒超声诊断仪,探头频率L7.5/8MHz;进行颈动脉横截面的血液流层的观察并对正常血液流层显像特征进行分析。结果126例颈动脉横截面血流流层的彩色多普勒图像观察发现,在心脏收缩早期颈总动脉血管明显扩张,血液流层呈五彩色;在心脏收缩晚期与舒张早、中期颈总动脉血管管腔逐渐缩小,呈现血管边缘区有红黄彩带,中央是蓝色暗区,两者之间是亮色与白色彩带。心脏舒张晚期动脉血管管腔最小,边缘区有红黄彩带中央夹杂着蓝色暗区。结论对126例彩色多普勒超声成像颈动脉横截面血液流层的观察分析,发现动脉的血液流层是随心动周期而发生周期性变化的,在心脏收缩中、晚期至心脏舒张早、中期,在扩张的颈动脉边缘区形成了一个快速的流层,与中央区流速缓慢并在收缩末期至舒张早、中期有返流的中心流层,这样就形成了动脉边缘快中心慢的双层面流动。

Objective To explore the color Doppler sonographic characteristics of blood flow strata of carotid horizontal sections and their normal imaging features.Methods The study population consisted of 126 healthy volunteers.Blood flow strata of the carotid artery were studied on Toshiba SSA-340A color Doppler sonography with a transducer of L 7.5/8 MHz and their imaging features were analyzed.Results On the color Doppler sonograms of the carotid horizontal sections,the common carotid artery demonstrated remarkable dilation with five-colored blood flow strata in the early systole;the lumen of the common carotid artery gradually constricted with a red and yellow border stripe,a dark blue central area and a bright white stripe red and yellow between in the late systole the early and middle diastole.In the late diastole,the diameter of the common carotid artery reached its lowest value with a red and yellow border stripe mixed with dark blue areas in the central part.Conclusions In the observation of the color Doppler sonographic imaging of the blood flow strata of carotid horizontal sections in 126 cases,it was demonstrated that the arterial blood flow strata changed periodicly with cardiac cycle.A rapid blood flow stratum was formed in the border region of the dilated carotid artery and a slow blood flow stratum or a stratum with reflux in the ceatral area in the late systole and the early and middle diastole.Therefore arterial double-strata flowing with its rapid border flow and slow center one is formed.