128P The role of volumetric modulated arc therapy in left breast cancer

Abstract

Three dimensional conformal radiotherapy (3D-CRT) has long been used as a standard treatment for early stage breast cancer. However, the homogeneity, conformity in the target volume (PTV), and the dose to nearly organs at risk (OAR) was a concern. Using field-in-field as intensity modulation improved the homogeneity and conformity in the PTV, yet the dose to OARs still require further improvement. In this study, we aimed at analyze the dose volumetric parameters (DVP) of 3D-CRT and VMAT plan to identify a better for left breast cancer, in particular dose reduction to heart and the left anterior descending artery (LAD).