Treatment delivery accuracy and efficiency
Compared to clinical TrueBeam plans, Halcyon APBI plans delivered higher total MU indicating slightly higher beam modulation. Mean values of total MU (Summary of treatment delivery parameters evaluated for TrueBeam and Halcyon plans for APBI patients.
As mentioned earlier, treatment delivery accuracy of APBI treatments was evaluated by delivering each QA plan on both platforms via on‐board EPID and recording the clinical gamma pass rates via portal dosimetry. While, the better TPS model could deliver the higher VMAT QA pass rates, the dose delivery accuracy of our clinical TrueBeam APBI plans and the corresponding Halcyon plans were 97.9% and 99.6% on average, respectively, using 3%/2 mm clinical gamma criteria. Although, statistically significant (