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.

Continue Learning about Radiation Therapy For Cancer

How do doctors shape radiation therapy based on a tumor's shape and size?
Tania B. Kaprealian, MDTania B. Kaprealian, MD
A multileaf collimator is used to shape the beams of radiation to the individual tumors. The multile...
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What is intraoperative radiation therapy (IORT) for cancer?
Aurora Health CareAurora Health Care
Intraoperative radiation therapy (IORT) is a selectively used special procedure in which radiation i...
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What is external beam radiation therapy?
PearlPoint Cancer SupportPearlPoint Cancer Support
External-beam radiation therapy is used to treat cancer. With external-beam radiation therapy, the r...
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What are side effects of external beam radiation therapy?
Intermountain HealthcareIntermountain Healthcare
Side effects from external beam radiation therapy include:Fatigue. It helps to get at least 8 hours ...
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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.