VMAT 50/57Gy

A knowledge-based planning (KBP) model is designed to provide a simple and robust comprehensive VMAT solution for right or left intact breast and post mastectomy comprehensive lymph node (CLN) radiotherapy treatments without increase in low dose wash.

The dose prescription which the model is compatible with is 50Gy in 25 Fractions with the addition of a 57Gy simultaneous integrated boost (SiB) as required.

This model was created using three 6FFF arc Halcyon plans calculated on ARIA Eclipse (Version 16.1.4) with Acuros External Beam (Version 15.6.06) and Photon Optimiser (Version 16.1.0) but is also compatible on TrueBeam with Acuros External Beam (Version 15.6.06) and jaw tracking.  

Overshoot was used via “SkinFlash-Bolus” of at least 0.5cm and is included into the function of model and planning process.

The “Automatic Intermediate Dose” function of the Photon Optimizer was utilized with MR3 level of restart and convergence mode and/or convergence mode: extended selected in the calculation options. These settings should be changed prior to starting the optimization or plan quality will be compromised. Plan normalisation is for all plans to account for skin flash in the optimization.

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