Influence of vascular shape extraction method and Non-Newtonian hemodynamic behavior on WSS distribution estimation on cerebral aneurysm in MR based CFD is evaluated. Firstly, shapes of straight pipe are extracted from Contrast-Enhanced MRA (CE-MRA) image, Phase-Contrast MRA (PC-MRA) image and time avaraged PC-MRA image. With each extracted shape, WSS distribution is calculated using CFD. The WSS ditribution calculated with the shape extracted from CE-MRA image shows the good accuracy with the theoretical distribution, while the result with the shape extracted from PC-MRA images shows unsatisfactory accuracy. Secondly, the WSS distributions computed by CFD considering blood as between Newtonian fluid and Non-Newtonian fluid are compared. The Power Law model and Carreau model are employd as Non-Newtonian model. Because the results obtained with Newtonian model, Power Law model, and Carreau model were almost same, it is concluded that Newtonian model is valid enough to model the blood for evaluating WSS distribution.
