Cerebral aneurysm is one of the modern “killers” of human health. Currently, the only effective treatment for cerebral aneurysms is surgery, which usually involves craniotomy, clamping of the aneurysm, and minimally invasive interventional embolization of the aneurysm. Regardless of the surgical option, a metallic foreign body, such as aneurysm clips, microsprings, and vascular stents, is implanted into the skull. However, cerebral aneurysm surgery is a difficult procedure and has a high mortality rate once the aneurysm ruptures, making it a high-risk of high-risk procedures in cranial surgery. Clinically, many patients ask, “After cerebral aneurysm surgery, is it possible to do head MRI which can show the anatomical structure of brain tissue more clearly than head CT after intracranial implantation of metal foreign body?” In this regard, Zhao Haikang, director of the Department of Neurosurgery of the Second Affiliated Hospital of Xi’an Medical College, said, “After brain aneurysm surgery, a metal foreign body will be left inside the skull, and whether the head MRI can be done needs to be analyzed from two aspects: one is the nature of the material and the other is the field strength of the MRI. With the development of medical material technology, there are more and more choices of intracranial implants for brain aneurysm surgery. When the implant is a plastic material, there is no problem to do MRI; when the implant is a titanium alloy material (currently used more), it is compatible with MRI most of the time, but during the examination, the MRI field strength should preferably not exceed 3.0T; when the implant is a steel material, MRI is contraindicated and must not be done! Director Haikang Zhao pointed out that after craniotomy, the decisive factor for whether MRI can be done is the nature of the implant material. Except for patients with steel implants, patients with implants of other nature can basically do MRI to confirm their own situation without worrying about the adverse effects on themselves. Director Haikang Zhao reminds patients that before having brain aneurysm surgery, it is best to clarify the nature of the implant material with the doctor in charge so that it is no longer a matter of doubt and worry whether an MRI can be chosen when doing the examination.