Magnetic resonance imaging of the head is performed to check the following aspects: 1) to find out if there is any head infarction or bleeding in the head; 2) to check for inflammation of the head by magnetic resonance imaging, which requires scanning and enhancement of magnetic resonance imaging of the head; 3) to check for primary head tumors or metastases in the head by magnetic resonance imaging of the head. The cranial examination, especially the cranial magnetic resonance angiography, can be performed to understand whether there is any cranial artery stenosis or cranial vein vascular examination to see whether there is any cranial vein thrombosis, and then the wave spectrum examination can also be performed to understand whether there is any degenerative disease.