Total monitor units influence on plan quality parameters in volumetric modulated arc therapy for breast case

The data suggest that the best plan is the reference one, where the “MU Objective” tool was not used during optimisation. Nevertheless, it is advisable to use the “MU Objective” tool for re-planning when low GAI is found to increase its value. In this case, attention should be paid to OARs dose limits, since their values may be increased.