Inclusion Criteria:

1. Adults under the age of 80
2. Coronary angiography shows coronary artery disease, with at least 2 coronary arteries having a degree of stenosis greater than 80%
3. ft ventricular ejection fraction (LVEF)<40%
4. Acute myocardial infarction onset for at least 3 months
5. Patients with old myocardial infarction with no acute coronary artery events in the past 3 months
6. Patients of pre implementation of coronary artery bypass grafting (CABG) or combined treatment with human umbilical cord mesenchymal stem cells (iPSC)
7. Agree to participate in this clinical trial and sign an informed consent form
8. Good compliance

Exclusion Criteria:

• 1.Patients with diabetes or other patients with poor blood glucose control (fasting blood glucose value on the test day is greater than 10mmol/L) 2.Patients who allergy to MR contrast agent 3.Electronic implants such as pacemakers, nerve stimulators, insulin pumps, cochlear implants 4.Patients who have undergone aneurysm surgery and have intracranial aneurysm clips 5.Patients who have undergone heart surgery and have an artificial heart valve 6.Patients with metal foreign objects in the eyes 7.Patients with metal implants and prostheses, or metal foreign bodies in other parts of body 8.Severe liver and kidney dysfunction 9.Accompanied by arrhythmia such as atrial fibrillation, cerebrovascular disease, and severe pulmonary heart disease 10.Pregnant or plan to pregnant within three months or lactating women 11.Critically ill patients who require the use of life support systems 12.Patients with claustrophobia 13.Other situations which clinical trial personnel deem it inappropriate to participate in this trial