There are a variety of examination methods to choose from for the head examination, and the specific choice of which method to choose depends on your specific situation and needs.
Cranial CT: X-ray examination of the structure of the brain, which can check for brain trauma, cerebral hemorrhage, brain tumor and other lesions. The non-contrast CT scan of the head can see the condition of the head and the skull, and can make a preliminary judgment on whether the structure of the brain is normal, but if you still want to see the condition of the cerebrovascular system, you need to add CT enhancement (you need to create a contrast agent) and CTA on the basis of the non-contrast CT scan of the brain. CT is quick and easy, but there is radiation, so children and pregnant women should be cautious
Brain MRI: It is more accurate than CT and can detect cerebrovascular diseases, brain tumors, encephalitis and other lesions, as well as brain development. If you want to see cerebral blood vessels, you can add MRA on the basis of cerebral magnetic resonance scanning, which is better than CT is that at present, magnetic resonance imaging does not need to be done to enhance magnetic resonance, which reduces uncomfortable situations such as injections and allergies. 
Transcranial Doppler ultrasound: It is used to check the blood flow of cerebral blood vessels, which is helpful for finding cerebral vascular stenosis, cerebral arteriosclerosis and other lesions. It is simple and non-invasive, and can be used as a means of physical examination and screening. 
Electroencephalogram: It is used to check the electrical activity of the brain and helps to detect abnormalities such as epilepsy, brain tumors, cerebrovascular diseases, etc. Most of them are used for patients with convulsions suspected of epilepsy, or some auxiliary tests for viral encephalitis, and are generally not used as physical examinations for ordinary people. 
Other tests, such as PETCT isotope scanning, are generally not used for brain examination and screening. Tracking and localization of tumors with more systemic metastases. All in all, if you are just doing a simple head physical examination, you can choose a non-contrast CT scan of the head or a non-contrast MRI scan, but if there are some other requirements or circumstances, you need to make further choices on this basis according to the situation, such as whether to do enhancement, CTA, MRA, etc., which requires professional judgment, and the doctor will choose the most suitable examination method according to the situation.