Clinical Applicantion of Multi-Tracer PET/MR Imaging in Neurological Disorders/Disease

This study is using advanced brain imaging — a combination of PET and MRI scans — to better understand several neurological conditions including Alzheimer's disease, mild memory problems, Parkinson's disease, epilepsy, and brain tumors. Using multiple radioactive tracers at once gives doctors a more detailed picture of what is happening in the brain. **You may be eligible if...** - You have been diagnosed with mild cognitive impairment (early memory problems) or Alzheimer's disease - You have been diagnosed with Parkinson's disease or REM sleep behavior disorder (acting out dreams) - You have epilepsy or a malignant brain tumor - You are being admitted to the hospital for treatment **You may NOT be eligible if...** - You received radiotherapy or chemotherapy in the past 3 weeks - You have taken Alzheimer's or Parkinson's medications in the past month - You have uncontrolled seizures that prevent cooperation with the exam - You have poorly controlled blood sugar or other unstable medical conditions Talk to your doctor to see if this trial is right for you.