1. A method for visualization and analysis of an acquired time intensity sequence of images of a blood flow of the advance of a contrast agent through a region of interest in a vascular system of a patient, comprising the steps of: obtaining information on the pulsatile nature of the blood flow; modifying the acquired time intensity sequence of images using the obtained information to remove therefrom an influence of pulsatile flow, the modifying producing a modified sequence of images; determining a temporal offset between the acquired time intensity sequence of images and the modified sequence of images such that a concentration of contrast agent at a pre-selected point in time has maximal similarity between the two sequences of images; offsetting the modified sequence of images by the determined temporal offset; and providing both the acquired time intensity sequence of images and the offset sequence of images to an image analysis system.