SPECT (single-photon emission computerized tomography) scan lets your doctor analyze the function of some of your internal organs. The scan is a type of nuclear imaging test, which means it uses a radioactive substance and a special camera to create 3-D pictures. While imaging tests such as X-rays can show what the structures inside your body look like, the scan produces images that show function. For instance, it can show how blood flows to your heart or what areas of your brain are more active or less active. The SPECT scan also provides a look at the overall health and levels of toxicity of the brain. It can be used to help guide nutrient therapies for better cognitive function. Many people have inflamed brains affecting both mood and social behaviors.