Outfield Dose Calculation in Treatment of Breast Cancer Using Radiotherapy TPs

This was analytical study carried out to calculate the amount of radiation dose received by critical organ inside and outside radiation field in external beam radiation therapy of breast cancer to evaluate unnecessary radiation hazard that may arise from it, and to extract the better precaution that should be done in order to manage the unacceptable doses. Conventional radiotherapy is the most method used to treat cancer in developing countries. This study was conducted in radiation and isotopes center of Khartoum (RICK) in December 2014, 85 patient was undergoing dose computation using pinnacle 3 treatment planning system which used to distribute and calculate the dose to point inside and outside radiation field limit for the lung and skin using central axis dose calculation parameters, the variable collected was isodose line at measurement points, %DD, separation SQR, age and the stage of disease. The mean dose was 3168.2453.3cGy, 539.4147.8cGy, 2914.167629.13cGy for lung and skin respectively. This dose is considered significantly high and may exceeding the tolerance of this organ which lead to increase radiation complication to the patient