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SIMON FRASER / SCIENCE PHOTO LIBRARY SIMON FRASER / SCIENCE PHOTO LIBRARY
Computed X-ray tomography (CT) scan of the abdomen of a woman aged 61 years, showing a normal liver - the dominant, curved, blue feature on the image. Immediately below the liver in centre is the abdominal aorta (blue, circular). The spine is at bottom. In CT, a narrow X-ray beam is directed through the subject towards a diametrically- opposed detector. A series of "slices" is made, with source & detector moving synchronously around the subject. Measurements of transmitted X-rays are processed by computer to reveal how elements of tissue in each "slice" attenuate X-rays - the basis for constructing the image. Courtesy of Radiography Dept., RVI, Newcastle.
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