Head CT and head MRI are imaging methods commonly used in clinical practice to examine head diseases, and their differences are mainly as follows: 1. The imaging principles are different, CT uses radiation for examination and can perform tomographic scans of the head, while MRI uses an applied magnetic field and can perform cross-sectional, sagittal and coronal scans of the head. 2. The price of head CT is relatively cheap, generally around 100 yuan, while the price of head MRI is relatively high, generally around 400 yuan. 3, the impact on the body is different, CT uses radiation, so there is a certain amount of damage to the human body, while MRI uses the external magnetic field, there are no side effects on the human body. 4, the focus of the examination is different, CT on the density of CT has a higher resolution, so it is more accurate in diagnosing hemorrhagic diseases in the brain, while MRI has a higher resolution for soft tissue, so it has a higher resolution for cerebral infarction and tumor lesions in the brain.