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Foods to Eat Before a PET Scan. A PET (positron emission tomography) scan is a powerful process for detecting cancer. Cancer cells grow extremely fast and need a lot of glucose. A doctor will inject the patient with glucose, and the PET scanner detects if any cells are emitting signs of high glucose use. If you eat before your PET scan, you risk throwing your glucose levels off balance and getting inaccurate results.
PET scans, short for Positron Emission Tomography, can detect areas of cancer by obtaining images of the bodyâs cells as they work. First, you are injected with a substance made up of sugar and a small amount of radioactive material. Cancer cells tend to be more active than normal cells, and they absorb more of the radioactive sugar as a result. A special camera then scans the body to pick up any âhighlightedâ areas on a computer screen.