A method and system for tracking blood flow within a vessel of a patient are presented. At least one or more medical images of the patient are acquired showing at least one vessel of the patient. A user marks a proximal point and a distal point on a vessel of interest on the medical images. The vessel of interest is tracked and corrections are made to the tracking using a tracking algorithm. A composite image is generated that encodes time to peak contrast agent intensity at each point of the vessel of interest as well as the intensity of the contrast at that time. A graph of time to peak contrast agent intensity versus distance from a proximal point of the vessel of interest is calculated and displayed to a user.
