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What are external and internal forms of radiation therapy for cancer?

Radiation oncologists use both internal and external forms of radiation therapy to treat cancer. Proton, IMRT, Gamma Knife and more conventional X-ray therapies are external therapies. These treatments are delivered by machines located outside the body. Internal radiation therapy involves placing the radiation source into a small implant and placing it near the cancer site.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.