1. A method for determining a concentration of a contrast agent in imaging data, the method comprising: calculating a pre-contrast attenuation map of a region of interest of a patient; following an administering of a contrast agent to the patient, calculating a post-contrast attenuation map of the region of interest of the patient; determining an increase in attenuation value based on the pre-contrast attenuation map and the post-contrast attenuation map; and calculating a contrast agent concentration map for the region of interest based on the increase in attenuation value.