MRI is an examination without ionizing radiation and is relatively safe. The following conditions should be noted during the MRI examination: 1, the MRI space is confined, the noise is high, and the light is dark, so claustrophobic patients should not do this examination; 2, metal has a greater impact on the magnetic field of the MRI, so when doing the examination, patients should not bring metal or magnetic objects, pacemakers or other human implanted metal medical equipment patients can not do this examination; 3, the MRI examination takes a long time and requires Patients need to cooperate quietly, and it is more difficult for children to cooperate, so they need to choose carefully.