Doses for Organs at Risk For Patient Undergoing Mammosite Brachytherapy System of Left Breast with HDR Ir-192

Limited dosimetric data using human phantom were used to predict dosimetric information about the hazard of radiation delivered to adjacent organs to the left breast during the use of Mammo Site single lumen applicator. This study uses Rando® female phantom, TLD 100H, and treatment planning to measure doses delivered to PTV, Breast, and OARs. The use of Mammo Site single balloon catheter (5 cm diameter), homemade breast phantom, a number of dosimeters (TLD 100H), annealing device, Harshaw TLD reader, Rando® female phantom, CT scan, Oncentra Master Plan version 4.3, and micro Selectron v3 treatment unit (mSel v3 (18)). After positioning of the MBS balloon inside the lumpectomy cavity which has a diameter of 5 cm and taking a CT scan; the treatment planning was developed to a achieve ABS, TG-43 protocol and RTOG-0413 protocol recommendations and optimizing dwell positions and dwell times. The delivery of radiation was by the use of 340 cGy per fraction after treatment planning was exported to the treatment unit device and dosimeters (TLD 100H) were positioned at certain locations inside phantom then doses were read.