血液流变性对超声多普勒血流频谱图的影响

Effect of Hemorheology on Ultrasonic Doppler Blood Flow Spectrum Diagram

研究目的在于指出长期存在的只从血流动力学角度而未从血液流变学角度分析频谱图的缺陷。借助血流动力学、流变学理论完整、准确地阐明颈内动脉血液在流速较快和较慢时频谱图的成因。最后推出4个结论:只要流速梯度足够大,即使在大或较大血管中也会出现明显的红细胞向轴集中;频谱图是血液二相流模型的强有力证据;将血流动力学、流变学相结合才能对频谱图进行全面、正确地分析;当无红细胞向轴集中时,大或较大血管内血液才可看作均质流体。

The present research aims to point out the long-existing defect of analyzing the spectrum diagram only from the perspective of haemodynamics instead of haemorheology. In the light of the theories of haemodynamics and haemorbeology, the causes of spectrum diagram formation of carotid artery blood at the rapid and slow flow can be clarified completely and accurately. Four conclusions have been drawn in the end. As long as the velocity gradient is large enough, obvious red blood cells concentrate to the shaft even in the big or bigger blood vessels; the spectrum diagram is the powerful proof of the two phase flow model of blood; the spectrum diagram can be completely and accurately analyzed only by combining haemodynamics with haemorheology; and only when the red blood cells concentrate to the shaft, the big or bigger blood vessels can be regarded as haemogeneous fluid.