The aim of the ViVa project is to develop tools for the modern hemodynamicist and cardiovascular surgeon to study and interpret the constantly increasing amount of information being produced by non–invasive imaging equipment. In particular, we are developing a system able to process and visualize 3D medical data, to reconstruct the geometry of arteries of specific patients and to simulate blood flow in them. The initial applications of the system will be for clinical research and training purposes. In a later stage we will explore the application of the system to surgical planning. ViVa is based on an integrated set of tools, each dedicated to a specific aspect of the data processing and simulation pipeline: image processing and segmentation; real-time 3D volume visualization; 3D geometry reconstruction; 3D mesh generation; blood flow simulation and visualization. 1 Goals and Motivation Recent advances in non-invasive data acquisition technology, e.g., Spiral Computerized Tomogr...