Which radiation therapy utilizes high-energy beams to treat cancer?

The choice of external beam radiation therapy (EBRT) is correct because it specifically involves the use of high-energy beams, such as X-rays or electron beams, to target and treat cancerous tissues from outside the body. This non-invasive technique allows for precise delivery of radiation to tumors while sparing surrounding healthy tissues as much as possible.

EBRT is widely used in cancer treatment due to its effectiveness in shrinking tumors and inhibiting their growth. It can be used alone or in conjunction with other treatments, such as surgery or chemotherapy, depending on the type and stage of cancer. The technology behind EBRT has evolved significantly, with advanced imaging and planning techniques ensuring that radiation is directed only at the areas that need treatment.

Brachytherapy, on the other hand, involves placing radioactive sources directly inside or very close to the cancerous area, while radioactive seed implantation is a specific form of brachytherapy where small seeds are inserted. Neutron therapy utilizes neutron radiation rather than high-energy photons or electrons, distinguishing it from EBRT. Thus, while these other options serve important roles in cancer treatment, EBRT is defined by its high-energy external radiation approach, making it the correct answer.