JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY JAMES KING-HOLMES / SCIENCE PHOTO LIBRARY
Healthy brain. Computed tomography (CT) scans of the brain in horizontal (axial) section, from the base (top right) to the top of the brain (at bottom). At top centre, the position of the scan lines (or "slices") through the brain are seen. In the images the skull (cranium) surrounding the brain appears white. In most of the images the two hemispheres of the cerebrum can be clearly distinguished. This highly folded part of the brain is involved in conscious and intelligent thought. CT scanning creates "slice" images through the body using X-rays, and can detect brain tumours and cancer.
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