Quantification Of Shift In Isocenter For 2-Dimensional And 3-Dimensional Radiotherapy Plans For Various Common Treatment Sites

2-Dimensional radiotherapy treatment planning continues to be widely used for various treatment sites in developing countries due to resource constraints. This has significant effects and treatment volumes and consequently outcomes. In this study, an attempt has been made to quantify the variations in the isocenter position in 2-dimensional radiotherapy planning compared with 3-Dimensional radiotherapy planning for various common treatment sites. It was seen that the variation was maximum in treatment planning of the breast.