PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY PHILIPPE PLAILLY / SCIENCE PHOTO LIBRARY
Three-dimensional CT (computed tomography) scan of the chest cavity showing normal lungs: skin is coloured white, bone in blue & the lungs in yellow. CT scanning provides clear cross-sectional images of the body. X-ray beams are passed through the body in a circular track; the amount of X-rays absorbed by different tissues is recorded by detectors in the scanner and transformed via a computer into an image. This 3-D image was created on a Twin CT scanner, a device with a double source/detector system that provides improvements in scan time, image contrast & resolution & the ability to resolve organ volume.
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