An angio-MRI (Philips 3 Tesla MRI) imaging of the aortic arch will be first performed (as part of preoperative assessment or systematic follow-up of aneurysms or arteriovenous malformations). A first operator will perform the arteriography under the usual conditions without using the VN. A second operator will have access to the fusion imaging and will assess the accuracy of the coregistration. Snapshots will be taken by the second operator.