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应用血流向量成像技术(VFM)对正常人的主动脉弓血流流场进行可视化观察及定量研究。在VFM模式下采集87例健康志愿者主动脉弓长轴切面彩色多普勒动态图像,观察并定量分析主动脉弓流场向量分布特点、逆流和涡流的形成以及血流平均能量损耗(mEL)。结果:1主动脉弓各段峰值流速(Vp)均出现于快速射血期,但分布位置不尽相同;主动脉弓各段前向血流速度由等容收缩期迅速上升,至快速射血期达峰值后逐渐降低。2所有受检者于等容舒张期在主动脉弓小弯侧观察到逆流和涡流。3主动脉弓流场内mEL从等容收缩期开始迅速上升,在快速射血期达到峰值后逐渐降低,直到心房收缩期接近于零。VFM为研究人体主动脉弓流场提供了新的方法和思路。对正常人主动脉弓流场的可视化观察及定量研究可望为进一步研究主动脉疾病流场改变提供理论依据。
The blood flow field of the aortic arch of normal people was visualized and quantified by using the flow vector imaging (VFM) technique. A total of 87 healthy volunteers were enrolled in this study. The long-axis color Doppler images of the aortic arch were collected and the vector distribution of the aortic arch flow, the formation of reflux and vortices, and the mean mEL of blood flow were observed and quantified. Results: (1) The peak velocity (Vp) of each segment of aortic arch appeared in the fast ejection period, but the distribution was not the same. The anterior flow velocity in each segment of the aortic arch rose rapidly from isovolumic systolic to peak after rapid ejection Gradually decreases. 2 All subjects observed reflux and vortices at the lesser curvature of the aortic arch during isovolumic diastole. 3 The mEL in the flow field of the aortic arch increased rapidly from the isovolumetric systolic phase and gradually decreased after reaching the peak in the fast ejection phase until the atrial systolic phase approaches zero. VFM provides a new method and idea for studying human aortic arch flow field. Visual observation and quantitative study on the flow field of aortic arch of normal people are expected to provide theoretical basis for further study on the flow field changes of aortic disease.