1. A method for tracking a blood flow within a vessel of a patient comprising: acquiring one or more medical images of the patient using an imaging system, the one or more images comprising at least one vessel of the patient; identifying a vessel of interest on the acquired one or more medical images, the vessel of interest containing a contrast agent; tracking the vessel of interest; generating a composite image from the acquired one or more medical images, the composite image comprising a time to peak contrast agent intensity at points on the vessel of interest; and calculating a graph comprising the time to peak contrast agent intensity at the points on the vessel of interest versus a distance of the points along the vessel of interest to identify an approximate distance that the contrast agent flows along the vessel of interest.