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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.
Interstitial Brachytherapy-Permanent implants. 1  A gun-type applicator with a long hollow. 2  The needle is inserted into the deep tumor. 3  The needle is withdrawn 5 to 10 mm and another.  Repeated until the number of desired sources 1  are. Permanent implants are used for deep seated.