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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.
1 Using as low a dose of radiation as possible The radiation dose is balanced between being high enough to kill cancer cells, yet low enough to limit damage to healthy cells. 2  Spreading out treatment over time You may get radiation therapy once a day, or in smaller doses twice a day for several weeks. 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.