MRI (magnetic resonance imaging) is an examination using imaging of magnetic fields without the aid of X-rays, which is not harmful to the human body in terms of radiation and generally does not induce leukemia. 1. MRI belongs to a kind of examination in imaging without radiation damage, and it utilizes the intranuclear protons of hydrogen atoms in the human body to perform imaging, and these protons generate magnetic fields, which exhibit imaging capability. 2. Whereas there may be a risk of leukemia caused by various types of ionizing radiation, ionizing radiation refers to rays with short wavelengths, high frequencies and high energies, and also depends on the dose of radiation absorbed by the human body; leukemia may be induced only after the whole body or part of the torso has been exposed to a moderate or large dose of radiation. Therefore, nuclear magnetism generally does not induce leukemia, and it is recommended that patients choose the appropriate means of examination according to their specific conditions under the guidance of their doctors.