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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.
In brachytherapy, a radioactive substance (radioactive isotope) is placed directly into, or very close to, the tumour (called an implant). The radioactive substance can also be placed in the area where the tumour was removed. Brachytherapy is also called internal radiation therapy, short-distance radiation therapy, implant therapy or sealed radiation therapy.