Dosimetric assessment and secondary cancer risk in breast radiotherapy: a Monte Carlo approach

To calculate the risk of secondary cancer induction resulting from this dose through a Monte Carlo simulation code and voxel-based anthropomorphic phantom to determine radiation in organs and/or tissues with dosimetric importance effect using static MLC 3D-CRT technique. In work, radiotherapy treatment breast was simulated transport MCNPX 2.7.0 adult simulator FSTA_H50_M50. The absorbed doses for set were determined. A LINAC Varian 2100C device operated two techniques simulated: 2D open field (OF) 3D-conformational (3D-CRT), latter use multilayer collimator (MLC) breast, both acting 6 MV energy. highest values obtained ipsilateral lung (7.22 Gy (3D-CRT) 8.49 (OF)) contralateral (6.29 6.56 (OF)), generating these greatest risks induction. With OF technique, due non-collimation beam, there an increase all compared 3D-CRT, thus evidencing more effective improving homogeneity conformity target organ.