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Brachytherapy (HDR & LDR) Brachytherapy is a method of delivering radiation to tumors by placing radioactive sources either within or immediately adjacent to tumor tissue. Because the radiation source is very close to the tumor, therapeutic radiation can affect the tumor directly while minimally affecting normal tissue. Brachytherapy can be provided using low dose rate (LDR) or high dose rate (HDR) techniques, depending on the length of time the radioactive sources remain in place.
Most people have external beam radiation therapy with the same dose of radiation once a day, 5 days a week, Monday through Friday. Treatment lasts up to 6 weeks, depending on the type of cancer you have and the treatment goal. High-dose rate (HDR) implants. 2  In this type of brachytherapy, the radiation source is left in place for just 10 to 20 minutes at a time and then taken out. 3  You may have treatment twice a day for 2 to 5 days or once a week for 2 to 5 weeks.