Brain imaging refers to a variety of techniques used to visualize the structure and function of the brain. Common methods include MRI (Magnetic Resonance Imaging), which provides detailed images of brain anatomy, and fMRI (Functional MRI), which measures brain activity by detecting changes in blood flow. These techniques help researchers and doctors understand brain disorders and monitor treatment effects. Another important method is CT (Computed Tomography) scans, which use X-rays to create cross-sectional images of the brain. PET (Positron Emission Tomography) scans can show metabolic processes in the brain, helping to identify conditions like Alzheimer's disease. Together, these imaging techniques are essential for both clinical and research purposes.