Nowadays, various internal fixation materials are often implanted in surgical procedures and interventions, such as internal fixators, screws, anastomoses, screws, stents, pacemakers, embolization steel rings, etc. Such patients need to be screened when MRI is performed to avoid adverse consequences. Magnetic Resonance Imaging (MagneticResonanceImaging?, MRI for short), is the use of the principle of nuclear magnetic resonance, through a variety of different radiofrequency pulse excitation of hydrogen protons in the human body, nuclear magnetic resonance, and then accept the nuclear magnetic resonance signal from the protons, after computer processing to obtain images of various directions and different parameters for diagnosis. Magnetic resonance equipment has 2 parts with magnetic fields, namely a static magnetic field (also known as the main magnetic field, usually a superconducting magnet) with a magnetic field strength of 0.5-7.0 T (Tesla) and a gradient field used to generate and control the gradients in the magnetic field. It can be seen that the patient needs to be placed in a high magnetic field during the examination, if the body has ferromagnetic metal internal fixation materials, will be in the magnetic field can produce a huge gravitational force, so that it can move, distortion, causing the internal fixation to lose its role, and even produce new damage to the patient, some magnetic implants in the magnetic field may also be demagnetized, so the body has magnetic vascular clips, vascular bypass materials, metal dentures Therefore, patients with magnetic vascular clips, vascular bypass materials, metal dentures, metal implants, cochlear implants, and pacemakers should be contraindicated for magnetic resonance examination. However, not all patients with internal fixation cannot undergo magnetic resonance imaging (MRI). With the update of internal fixation materials, the spinal internal fixation, artificial joints, titanium clips and anastomosis nails that are increasingly used in clinical practice are all titanium alloy materials, which have less influence on MRI images because they are not magnetically sensitive, and the internal fixation will not be displaced or deformed when MRI is performed, so for patients whose internal fixation materials have been clearly identified as titanium alloy or non-magnetic materials (need to be determined by the surgeon or Therefore, for patients whose internal fixation material is titanium alloy or non-magnetic material (need to be determined by the surgeon or have the description of internal fixation material), MRI can be performed.