1. A method for hemodynamic assessment of a coronary artery based on medical image data of a patient, comprising: extracting patient-specific anatomical measurements of the coronary arteries from medical image data of a patient; calculating patient-specific boundary conditions of a computational model of coronary circulation representing the coronary arteries based on the patient-specific anatomical measurements of the coronary arteries; simulating blood flow and pressure in the coronary arteries using the computational model of coronary circulation and the patient-specific boundary conditions and modeling coronary autoregulation during the simulation of blood flow and pressure in the coronary arteries; and calculating a hemodynamic index for at least one region in the coronary arteries based on the simulated blood flow and pressure.