JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Healthy brain. Computed tomography (CT) scan of an axial (horizontal) section through the healthy brain of a patient aged 70. At top is the front of the brain. Sectioned at the level of the temporal lobes, brain tissue (light blue) fills the cranium and has a smooth outer edge. It consists largely of the two cerebral hemispheres, divided in the middle. Central dark areas form the ventricles, inner cavities of the brain. The circular area (at upper centre) is the brainstem. CT scanning uses X-rays to create "slice" images through the body. In the elderly, a CT scan may be used to detect brain disorders such as Alzheimer's disease which leads to the death of brain tissue.
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