Coloured axial MRI scan sequence showing a healthy brain in the head. The front of the head is at top. The scans start at the base of the head, showing the brainstem (red) that connects the brain to the spinal cord. The cerebellum is seen at the base of the back of the head, before the folded hemispheres of the cerebrum (blue and green) become visible. The eyes (red) are seen midway through the clip. The central ventricles (red) are seen within the cerebrum towards the end. Magnetic resonance imaging (MRI) uses radio waves and powerful magnet to image body tissues.