SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
False-colour normal chest X-ray of a 7 year old child. The image shows the skeleton of the spine, ribs and shoulder joints. Both lung fields appear dark, with opacities (pale areas) due to the bronchi & pulmonary blood vessels towards the mid- centre of each lung field. A normal-sized heart appears at centre-right in this posteroanterior (PA) image (that is, made with the radiographic film behind the patient's back & the X-ray source in front).
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