Dr. John Lambert:

Like an MRI scan or a CT scan, it is just a modality. Certain products are injected into the person's veins and then it goes to the brain. If there are abnormalities or inflammation, they will light up. It is a radiological scan that is different from a CT scan and it is different technology from an MRI scan. It is positive electron tomography. It lights up a different level of inflammation compared to a CT or MRI scan.