ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Colon cancer scans. Axial positron emission tomography (PET) and computed tomography (CT) scans through the abdomen of a 60-year-old man with colon cancer. The PET scan is at left, the CT scan is at centre, and a combined CT-PET scan is at right. These scans (at the level of the liver) were performed to see whether the cancer has spread to other organs. The scans show no signs of secondary cancers, but do show signs of a fatty liver (hepatic steatosis).
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