Clinical Research Directory

Inclusion Criteria: 1. Patients diagnosed with mild cognitive impairment (MCI) or Alzheimer's disease (AD), rapid eye movement sleep behavior disorder (RBD) or Parkinson's disease (PD), epilepsy, malignant brain tumors based on clinical guidelines. 2. Patients admitted to our hospital for inpatient treatment. Exclusion Criteria: 1. Patients who have undergone non-invasive/minimally invasive treatments such as radiotherapy or chemotherapy within the past three weeks. And Patients who have taken Alzheimer's disease-related and Parkinson's disease-related treatment drugs within the past month. 2. Patients with persistent seizures or status epilepticus that cannot be controlled by medication, resulting in an inability to cooperate with the examination. 3. patients with poorly controlled blood sugar and ineffective medication intervention. 4. Patients with absolute contraindications for PET/MR examination. 5. Karnofsky Performance Score (KPS) \<60.