Diagnosis of Structural Heart Disease Using MCG

Inclusion Criteria: * Those with suspected structural heart disease who are scheduled to undergo echocardiography or cardiac magnetic resonance. Structural heart disease includes cardiomyopathy (hypertrophic cardiomyopathy, dilated cardiomyopathy, restrictive cardiomyopathy, etc.), congenital heart disease (including ventricular septal defect, atrial septal defect, patent ductus arteriosus, Tetralogy of Fallot) syndrome, tricuspid valve malformation, etc.), valvular heart disease (aortic valve stenosis, mitral valve stenosis, etc.), ventricular remodeling caused by myocardial ischemia or cardiac structural changes. * Signed the consent form. Exclusion Criteria: * Those with atrial fibrillation, supraventricular tachycardia, atrioventricular block and other arrhythmias that have not returned to normal; * Those who are thought to be incapable of completing the relevant examinations by an attending physicians (or physicians with higher qualifications) due to unstable clinical conditions, metal implants, etc., or those who are unable to perform the examinations; * Those with obvious abnormal thyroid function, severe anemia or other blood diseases and other diseases that obviously affect the circulating blood supply; * Those with malignant tumors; * Pregnant or lactating women.