GCA / SCIENCE PHOTO LIBRARY GCA / SCIENCE PHOTO LIBRARY
Heart and lungs. False-colour computed tomography (CT) scan of an axial section through the chest, showing a healthy heart. At centre right is the heart (pink); the descending aorta (lower centre, circular pink) is a major artery from the heart that supplies blood to the body. On either side are the lung fields (coloured black). A cross- section of a thoracic vertebra of the spine (blue) appears below the aorta; circling the lungs are rib bones (blue). CT scans are obtained by taking a series of X-ray images from points on a circle around the subject. A computer is used to compare and arrange the resulting data into an image "slice" through the body.
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