An indication specific optimization algorithm is used to produce radiation treatment plans facilitating the Volumetric Modulated Arc Therapy (VMAT) technique.
Arc Duplication: The PTV is split into multiple (more) convex sub-volumes in order to support the subsequent VMAT optimization in finding a high quality treatment plan..
VMAT Optimization: Finding optimal Multi Leaf Collimator (MLC) shapes and control point weights (monitor units per arc segment) in order to fulfill the dosimetric constraints.
The following sections describe these steps in detail. Later sections describe how the optimization result can be modified and describe the technical background of VMAT plans.