The Primary Research Of Hemodynamics Of The Aortic Dissection

Objective:To establish the individualized model of Aortic Dissection and the idealized model of normal aortic artery based on Computational Fluid Dynamics technique. Both models are researched by the Finite Element Analysis. The hemodynamic parameters are obtained to investigate how dynamics affect the etiological factors, mechanism and theraphy of the aortic dissection.Methods:(1) The original DICOM format image data from a patient with aortic dissection were imported to the Software Mimics. Then the 3D object was constructed by the software. The acquired aortic data from 388 cases were analyzed in morphology. A idealized aortic model was constructed.(2).Both model were meshed by the Ansys Software. Then the Finite Element Analysis of both model was performed by the Ansys Software to gain hemodynamic parameters in every position at different timesteps.Results:(1)The individualized model of Aortic dissection and the idealized model of normal aortic artery were constructed successfully based on Computational Fluid Dynamics technique. The detailed aortic hemodynamic parameters were obtained. The data of the velocity field, pressure and wall shear were visualized intuitively.(2)There were low velocity field, much eddy current and low pressure change with time in the false lumen of the aortic dissection model.(3).The inside of normal aortic artery has higher wall shear and rangeability than the outside. There is sharp pressure change in the outside of the specified position of the aortic arch.Conclusions:1,The methods to construct 3D model are quick and accurate.2,The wall shera and pressure may not lead to the rupture of the false lumen of the aortic dissection. The wall shear may not related to the development of the aortic dissection. Pressure may related to the development of the aortic dissection.3,Hemodynamic factors may be related to the development of the aortic dissection.