One of the tools doctors uses is called an FDG PET scan. It’s a special kind of test that takes pictures of the brain. FDG is a type of sugar, and PET stands for Positron Emission Tomography. When someone has a PET scan, they get a tiny amount of this sugar injected into their body. Because the brain uses sugar as fuel, the scan can show which parts are working well and which parts aren’t. This is super helpful because in people with dementia, some parts of the brain don’t use sugar the same way healthy parts do. So, the scan can show doctors these changes and help them understand what’s going on.