Since its inception, the fractional coronary flow reserve (FFR) method has increasingly become a useful tool to assist interventional cardiologists. Many researchers around the world have demonstrated the important role of FFR in the diagnosis and treatment of coronary artery disease.

When the coronary arteries are damaged to a certain extent, the blood flow to the heart will not be enough, leading to myocardial ischemia. Therefore, patients need to be diagnosed early to have timely intervention methods. The diagnostic method by measuring the fraction of coronary flow reserve (FFR) is an invasive measure to assess myocardial ischemia accurately and effectively.