PET scan stands for ‘Positron Emission Topography’. It is helpful in studying the activity of brain. The radioactive tracers attached to glucose enter the brain through bloodstream. The rate of utilization of radioactive glucose indicates the different areas of brain activity. Indications of PET scan are: - Detection of tumors - Detection of metastasis - Diagnosis of dementias - Epilepsy surgery Reference: https://www.healthline.com/health/brain-pet-scan#procedure Image via: http://bachlab.pitt.edu/facilities/pet-imaging