Study the brain's blood flow and metabolic activity. A PET scan
can help a doctor find nervous system problems, such as Alzheimer's disease, Parkinson's disease, multiple sclerosis, transient ischemic attack, amyotrophic lateral sclerosis (ALS), Huntington's disease, stroke, and schizophrenia.
Find epilepsy in the brain.
Find some cancers, especially of the breast, brain, lung, colon, or prostate or lymphoma.