Abstract book - ESTRO meets Asia

S130 ESTRO meets Asia 2018

two scenarios of the dose difference/distance to agreement of 3%/3 mm and 2%/2 mm criteria, respectively. Results Overall, the average gamma agreement values for homogeneous and heterogeneous QA phantoms were observed higher than 94.9% and 95.4% for both energies and criteria. In addition, this study showed that the gamma agreement values obtained by both homogeneous and heterogeneous QA phantom agreed to within 2% for both 2%/2 mm and 3%/3 mm criteria. Furthermore, no difference was observed statistically significant in gamma agreement values obtained with homogeneous and heterogeneous QA phantoms for both energies and criteria This study demonstrated that no difference for the gamma agreement values was observed statistically significant in the heterogeneous phantom for both energies and criteria, compared to homogeneous phantom. Consequentially, this study found that patient specific QA results were not affected by phantom with the different materials. (p > 0.05). Conclusion