ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Colon cancer scans. Coloured medial sagittal positron emission tomography (PET) and computed tomography (CT) scans through the body 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 thoraco-abdominopelvic scans were performed to see whether the cancer has spread to other organs. The scans show no signs of secondary cancers.
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