CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
False-colour computed X-ray tomography (CT) scan of an axial section through the chest showing normal heart & lungs. The lung fields are coloured purple with black flecks, with the heart appearing roughly circular in shades of blue between them. Below the heart, one of the large thoracic vertebrae appears in section, its body & bony processes coloured yellow. To the right of this backbone is the aorta, the body's principal artery, which appears as a distinct blue circle.
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