This study is designed to use positron emission tomography to measure brain energy use. As the brain uses more fuel it produces more waste products, carbon dioxide and water.
Blood carries fuel to the brain and waste products away from the brain.
As brain activity increases blood flow to and from the area of activity increases also. As areas of the brain use more sugar the PET scan will detect the FDG and show the areas of the brain that are active. Do changes in brain metabolism match the severity of patient's seizures 6. You will be asked to visit the NIH once a year for three years. This study is not currently recruiting new subjects.