Higher homogeneity index in close proximity targets with different dose prescription with VMAT compare to IMRT

Many advanced treatment delivery technologies like IMRT, VMAT, tomotherapy have been used widely in radiotherapy. In the different delivery techniques, the relative merits of dosimetric advantage and the feasible treatment parameters play an important role in the decision making at the time of plan approval for clinical treatment. In the context of a plan with different levels of dose prescriptions for two or more targets, higher dose spillages are presented in the targets with lower dose prescription. This can be resulted an heterogeneous dose distribution. Therefore, the plan evaluation has to be carried out to identify the amount of homogeneous dose distribution in the targets with a lower dose prescription