  In this paper we introduce a new method simulating stent graft deployment for
assisting endovascular repair of abdominal aortic aneurysms. The method relies
on intraoperative images coupled with mechanical models. A multi-step algorithm
has been developed to increase the reliability of simulations. The first step
predicts the position of the stent graft within the aorta. The second step is
an axisymmetric geometric reconstruction of each individual stent. The third
step minimizes the rotation of each stent around its main axis. Finally, the
last step virtually deploys each stent within a deployment box extracted from
the preoperative CT scan. A proof of concept is performed on a patient. The
accuracy is compatible with the clinical threshold of 3 mm: the average
distance between target and simulated stents is 1.73 $\pm$ 0.37 mm.
Fenestrations of the stent-graft are reconstructed with a maximum error of less
than 2.5 mm, which is enables a secure catheterization of secondary arteries.
In summary, the method is able to assist EVAR practitioners by providing all
necessary information for a fast and accurate stent graft positioning,
combining intraoperative data and a mechanical model in a very low cost
framework.
