The brain research that involves monitoring the usage of glucose is called?

Positron emission tomography (PET) is a brain research technique that involves monitoring the usage of glucose in the brain. Researchers inject a radioactive form of glucose into the patient's bloodstream, and this glucose is used as an energy source by cells throughout the body, including in the brain. By following the path of the radioactive glucose using a PET scanner, researchers can identify which areas of the brain are most active.