1. A method of generating a blood flow representation, the method comprising: obtaining morphological information of a coronary artery on a heart in a cardiac image of a user; acquiring myocardial blood flow distribution information from a myocardial perfusion image of the heart; and generating a blood flow representation of the coronary artery based on the myocardial blood flow distribution information and the morphological information of the coronary artery by: segmenting the cardiac image into at least one myocardial region based on the morphological information of the coronary artery; determining a blood flow for each of the at least one myocardial region; adjusting the blood flow based on the myocardial blood flow distribution information; and generating the blood flow representation of the coronary artery based on the adjusted blood flow and physiological information of the user.