Dosimetrical Evaluation and Clinical Implementation of a Strut-adjusted-volume-implant Savi Device Used for Accelerated Partial Breast Irradiation

The SAVI (the Strut Adjusted Volume Implant) device is one of the most novel devices used in Accelerated Partial Breast Irradiation (APBI). Various dosimetric parameters, as well as doses to adjacent critical structures, have been evaluated in 121 patients in this single institution 5-year retrospective study, using dose volume histogram (DVHs): Coverage Index (CI), cavity and planning target volumes (PTV and PTV_EVAL), Max Skin Dose (MSD), Max Chest Wall Dose (MCWD), Skin Bridges (SB), Chest-Wall Bridges (CWB). Our analysis demonstrates the dosimetric versatility and outlines the clinical implementation process of the SAVI brachytherapy device, especially for APBI cases that require more flexible dose optimization, for both coverage of PTV volumes and sparing of dose to adjacent critical structures.