National Cancer Institute National Cancer Institute
U.S. National Institutes of Health National Cancer Institute
Dictionary of Cancer Terms
Send to Printer
photon-beam radiation (FOH-ton beem RAY-dee-AY-shun)

 A type of radiation therapy that reaches deep tumors with high-energy x-rays made by a machine called a linear accelerator.

Previous Definitions:phosphorus-32, photoactivity, photocoagulation, photodynamic therapy, Photofrin
Next Definitions:photopheresis, photophobia, photosensitizer, photosensitizing agent, phototesting