侧壁动脉瘤形态特点与血流关系的计算机数值模拟分析

Analysis on hemodynamic characters of the different lateral aneurysms with the help of 3D-compu tational numerical simulation

目的利用三维计算机血流动力学数值模拟技术分析不同形态侧壁动脉瘤的血流特点。方法选取资料完整的侧壁动脉瘤患者14例，在三维计算机断层扫描血管造影（CTA）图像基础上，利用本课题组自写程序及美国Fluent公司的Fluent6．02等，对动脉瘤进行三维计算机血流动力学数值模拟。得出动脉瘤血流速度、轨迹、剪切力等多项参数，结合动脉瘤形态特点进行对比分析。结果根据分析结果将患者侧壁动脉瘤分为两种类型。I型：动脉瘤长径与载瘤动脉中心轴不共面，模拟结果显示动脉瘤中有涡流产生，血流速度范围0．86～1．03m／s。Ⅱ型：动脉瘤长径与载瘤动脉中心轴共面，模拟结果显示动脉瘤中无明显涡流产生，血流速度范围0～0．013m／s。结论从I、Ⅱ型动脉瘤特点可知，侧壁动脉瘤的形态特点决定瘤内血流特点。

Objective By 3D-computational numerical simulation, to analyze the hemodynamie characters of different lateral aneurysms. Methods In 14 cases of lateral aneurysm with complete clinical data, on the basis of 3D-CTA image, self-designed program and Fluent 6. 02 softwares were used to simu- late blood flow in the aneurysm. The blood velocity, fluid track, wall shearing stress, etc. were obtained. Results The patients were claffied into two types ： Type I , the longest diameter of the aneurysm and the central axis of the mother artery were not in the same plane, there was turbulent flow, and the blood veloci- ty was 0. 86-1.03 m/s; Type Ⅱ ： the longest diameter of the aneurysm and the central axis of the mother artery were in the same plane, there was no typical turbulent flow, and the blood velocity was 043. 013 m/s. Conclusion From the characters of types I and Ⅱ aneurysm, It is speculated that the hemodynamics is related to the morphology of lateral aneurism.