Volumetric Magnetic Resonance Imaging (vMRI) is a non-invasive brain imaging technique done to measure the volume and structure of specific regions of the brain. It is useful for many things, but primarily for discovering atrophy (wasting away of body tissue) and measuring its progression. vMRI is used to monitor atrophy of certain key brain regions affected by Alzheimer’s disease, including the hippocampus, medial temporal lobe, posterior cingulate gyrus and lateral parietal region.