Stock Photo: CURIETHERAPY. CURIETHERAPY Photo essay from hospital. Brachytherapy at the Hôpital Saint Louis in Paris. Brachytherapy is one type of treatment for breast cancer. It uses radioactive iridium wires placed directly in the tumor or in the area from which the tumor was removed. This technique can also be used to deliver an additional dose to the scar, an area which is susceptible to relapse. All the catheters have been inserted, and stops are positioned to keep the catheters in place.