Inclusion Criteria:  1) Meet the diagnostic criteria for acute ST-segment elevation myocardial infarction: ①The onset of ischemic chest pain lasts for more than 30 minutes and cannot be relieved by taking nitroglycerin; ②The ECG has two or more ST-segment elevations in adjacent leads , Limb leads ≥ 1mm, pectoral leads ≥ 2mm; or newly-appearing left bundle branch block; ③The increase in serum markers of myocardial necrosis is at least twice the normal value; (2) Coronary angiography confirmed acute myocardial infarction; (3) Direct PCI treatment within 12 hours of onset; (4) Complete clinical and radiographic data.  Exclusion Criteria:  (1) Those who do not cooperate in the inspection, have poor compliance, and cannot guarantee the completion of the test; (2) Persons with consciousness impairment, obvious intellectual impairment and mental abnormality; (3) With metal foreign bodies, such as metal prostheses, intraocular metal foreign bodies, intracranial aneurysm clamps, etc.; (4) Those who suffer from closure phobia; (5) Those who have had a history of myocardial infarction, PCI treatment, or coronary artery bypass graft; (6) Factors affecting the changes in the ST segment of the electrocardiogram: complete left bundle branch block, pre-excitation syndrome, pacemaker electrocardiogram