What does the term 'brachytherapy' refer to?

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Treatment using chemical drugsRadiation delivered directly inside the body via cathetersUse of laser technology for treatmentRadiation that affects healthy surrounding tissuesExternal beam radiation therapy

Explanation

Brachytherapy is a form of radiation treatment where radioactive sources are placed directly within or near the target area using catheters, allowing localized radiation delivery while minimizing exposure to surrounding healthy tissues.