The differences between head CT and MRI are as follows: First, the imaging principles are different: head CT uses different degrees of attenuation of rays after passing through a person’s head to image, while MRI uses the influence of magnetic fields on water protons in the human body to image. Secondly, head CT is more sensitive to hemorrhagic diseases, such as cerebral hemorrhage and subarachnoid hemorrhage that can be imaged immediately, but head CT is not clinically sensitive to ischemic cerebrovascular diseases, which need to be imaged after about 24 hours. Secondly, MRI is more sensitive to ischemic diseases, for example, cerebral infarction can be imaged and visualized within two hours, MRI is not sensitive to hemorrhagic diseases, and currently magnetic sensitivity imaging can suggest cerebral hemorrhage. Finally, the MRI of intracranial occupational diseases will be more clear.