Cerebral aneurysm is one of the major diseases that jeopardize life and health, and is considered to be a high-risk among the high-risk cranial surgeries due to the difficulty of the surgery and the high mortality rate in case of rupture. Once detected, intracranial aneurysms usually require surgical treatment, including craniotomy to clip the aneurysm, isolated aneurysm, and minimally invasive intervention to embolize the aneurysm. With any of these surgical procedures, a metallic foreign body is implanted into the skull, such as aneurysm clips, cranial fixation nails, micro-spring coils, and vascular stents. Many patients, including radiologists, ask, “Can I still get a head MRI once these materials have been placed?” After all, a head MRI shows the anatomy of the brain tissue more clearly than a head CT. To answer this question, you need to analyze two aspects, the nature of the material and the field strength of the MRI. With the progress of technology, material production process is also progressing, if the plastic nature of the material, it can be said with certainty that the MRI is no problem at all; the nature of the commonly used materials are usually titanium alloy, the current level of technology, most of these materials are fully compatible with the MRI examination (the best MRI field strength of not more than 1.5T); for steel implant materials, is not compatible at all! MRI is contraindicated! So, after craniotomy, MRI depends on the nature of the specific implant material. Except for materials made of steel, basically you can do MRI without worrying about adverse effects. It should be reminded that before you do it, you must clarify with your own competent doctor exactly what kind of nature of the implant material oh.