The material of the oval foramen blocker is usually non-magnetic metal such as nickel-titanium alloy, etc. It is usually possible to do MRI, but you should also consult with the relevant doctor before the examination.
When doing an MRI, the machine will form a strong magnetic field, and the presence of magnetic metal will generate a strong suction force that will cause harm to both the human body and the equipment, and will affect the diagnosis.
The material of the foramen ovale blocker is generally super elastic nickel-titanium alloy, and the internal material is generally polymer biofilm, which is basically unaffected by the magnetic field and can be used for the MRI examination.
You should also consult with the doctor concerned about whether there is any effect of MRI after the foramen ovale occlusion to avoid any adverse effect.