The vision of this project is to provide visual guidance through a virtual endoscope. Interventions like stent placement are frequently carried out using guidance form plain X-ray or MRI images. However, knowing the exact anatomy and being able to freely position the point of view can be extremely valuable during an intervention. We therefore developed a parametric model of the human aorta. In combination with our fast edge-based level set active contour operating on cross-sectional images, segmentation and visualization is possible at interactive rates for a large number of slices. The principle is illustrated through Fig 1.