The analysis of the cranial aneurysm's 3D - computational hemodynamics numerical simulation and the findings in operation

Abstract

Objective With the cranial aneurysm's 3D - computational hemodynamics numerical simulation, we can get the cranial aneurysms and its's mother arteries' blood flow rate, path and wall shearing stress and so on. Taking use of the contrast analysis of the hemodynamics result and the findings in operation,we can try to find the hemodynamic character and the mechanism of the rupture on the aneurysm.Method We choose 14 aneurysm patients with complete clinical data. With the 3D - CTA image, we take use of self - program, American Ansys - ICEM and Fluent6. 02 softwares to simulate blood flow in the aneurysm. Finally we got the wall shearing stress distribution on the aneurysm, and contrastedly analyzed the results and the findings in operation. Result According to the analysis result, we can divide the patients into two groups. Group A:the rapture locates on the side wall of the aneurysm( 10 cases). The simulation results show there is turbulent flow in this kind of aneurysm. The wall shearing stress of the rupture is between 8. 5959 ～ 10. 8419 pascal,and the average is 9. 0704 pascal. Group B:The rupture locates on the tip of the aneurysm (4 cases ). The simulation results show there is no turbulent flow in this kind of aneurysm. The wall shearing stress of the rupture is between 0. 6983 ～ 0. 9744 pascal, and the average is 0. 8364 pascal. According to the character of group A and B,there is turbulent flow in the aneurysm with the rupture on the side wall ,and the wall shearing stress of the rupture is larger. There is no turbulent flow in the aneurysm with the rupture on the tip,and the wall shearing stress of the rupture is smaller. Conclusions If the wall shearing stress is too high or too low,it will cause the rupture of the aneurysm. The deduction helps to explain the mechanism of the aneurysm's rupture. Key words: Intracranial aneurysm; Hemodynamics; Numerical simulation