Whether or not magnetic resonance can be done after oval foramen occluder depends on the material of the occluder, if it is nickel-titanium alloy, ceramics, etc. are generally unaffected; if it is a magnetic metal material can not do magnetic resonance. Nitinol and ceramics are non-magnetic materials that do not produce deflective stress in a static magnetic field, which generally does not affect the results of the examination. Generally after cardiac intervention, if you need to receive an MRI examination, it is best to do it 6 months after the blocker intervention blocking treatment, at this time, the blocker has been completely endothelialized and fixed in the endocardium, and will not produce displacement. However, if it is other materials containing magnetic metal, it may affect the results of the MRI examination, or in the process of MRI examination of physical injury and other adverse consequences, it is not recommended that patients with magnetic metal materials in the body to do MRI examination. Due to the variability of products from different manufacturers, patients with blockers should confirm the nature of the blocker material before the MRI examination, and perform the examination after the doctor has assessed the condition and risk to avoid adverse consequences.