The basic principle of magnetic resonance is based on two important factors: one is the magnetic field generated by the magnetic resonance instrument, and the other is the nucleus, which is the nucleus of hydrogen atoms in the cells of human tissues and organs. The working principle of MRI is simply that the nuclei of hydrogen atoms in the examined tissue cells resonate under the action of a strong magnetic field, and this phenomenon is recorded by the MRI instrument, and then the data is reconstructed by the high-powered electronic computer inside the instrument, thus forming the MRI image for clinical diagnosis.