How is brachytherapy defined_____________?
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Answer: C. Irradiation of tissues by implants within the tissues
Explanation
Brachytherapy is defined as the irradiation of tissues by radioactive sources placed within tissues. Radioactive implants are placed directly inside or immediately adjacent to the tumor volume. This localized technique delivers a high radiation dose while sparing surrounding healthy tissues. Brachytherapy utilizes sealed radioactive isotopes like cesium, iridium, or iodine seeds. Interstitial and intracavitary placement methods allow continuous targeted radiation delivery to tumors. Radiation oncology teams calculate precise source placement to maximize tumoricidal effects.
Brachytherapy is commonly used to treat head and neck, prostate, and cervical cancers effectively. Minimizing radiation exposure to adjacent salivary glands reduces xerostomia complications significantly. Oncologic protocols often combine brachytherapy with external beam radiation for optimal results. Irradiation from a distance describes teletherapy or external beam radiation therapy methods. Irradiation from a specific distance of 3 cm is an arbitrary description without standard definition. Irradiation by radiopharmaceuticals administered systemically describes targeted radionuclide therapy procedures.
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