MRI has the effect of radiation. Similar to the cell phone, are radiation damage, generally do MRI on the human body damage impact is not large, so do not worry too much. Magnetic resonance has little effect on the human body, similar to the damage of radiation, the role of nuclear magnetic is not obvious, as long as you do not shine every day, year after year, there will be no side effects, there is no need to wear strict protective gear. Nuclear magnetic resonance, or MRI for short, is a biological magnetic spin imaging technology, which uses the characteristics of the spin motion of the atomic nucleus, within an applied magnetic field, after the excitation of radio frequency pulses to generate signals, detected with detectors and input into the computer, after processing conversion on the screen to display images. In other words, MRI is different from CT, X-ray, and radiography, it is not radioactive, but simply relies on a certain strength of magnetic field to excite the internal atomic spin axis of the object to maintain consistency, and generate a spin pulse, and then through this pulse signal to produce the required image. If we have to look deeper into the damage it brings to the human body, the main thing is that the strong magnetic field can cause displacement of metals, such as metal fragments in the eyes and brain, which can lead to brain damage and blindness under the action of the magnetic field. People with pacemakers and fracture internal fixation plates, heart stents, insulin pumps, history of brain surgery and eye injuries should be careful.