NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,919 terms related to cancer and medicine.

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image-guided radiation therapy
(IH-mij-GY-ded RAY-dee-AY-shun THAYR-uh-pee)
A procedure that uses a computer to create a picture of a tumor to help guide the radiation beam during radiation therapy. The pictures are made using CT, ultrasound, X-ray, or other imaging techniques. Image-guided radiation therapy makes radiation therapy more accurate and causes less damage to healthy tissue. Also called IGRT.