Application of multileaf collimator in breast cancer radiation techniques

摘要

Modem radiation therapy tools allow a precise delivery of a high dose to a target area (so-called planning target volume -PTV) and spare, at the same time, critical organs in the vicinity of cancerous lesions. One of the tools of conformal therapy is a multi-leaf collimator, which provides the opportunity to optimally adjust the therapeutic field to the tumor area. More difficult areas for radiation therapy include: mamma, after BCT , and chest after mammectomy with regional lymph nodes. The objective of the study is to present technical and physical aspects of breast carcinoma irradiation when applying a multi-leaf collimator. The following techniques were applied: a/ the isocentric technique of tangent fields (from two to four) for the mamma after BCT; b/ the method of a common isocenter, for the areas of mamma and for regional lymph nodes; c/ the technique of complementary photon + electron fields, for the area of chest after mammectomy and lymph nodes. The presented techniques were implemented as standard procedures in the preparation of breast carcinoma radiation treatment in the Lower Silesian Oncology Center.