Two years after atrial septal defect blockage surgery, it is usually possible to have an ankle MRI. Generally, the material used in atrial septal defect blockage surgery is nickel-titanium alloy, which usually does not affect ankle MRI. However, it is important to note that if an MRI is performed on the heart, artifacts may be produced, which may affect the results. Secondly the interval between postoperative MRIs varies between different brands of Nitinol materials. Many imported materials can be used for MRI directly after the surgery, while some materials may require a period of time between MRIs. Atrial septal defects are common congenital heart defects that require atrial septal defect occlusion to treat in severe cases. If properly managed, the prognosis is usually good and it does not interfere with daily physical examinations.