ESTRO 2023 - Abstract Book

S1511

Digital Posters

ESTRO 2023

Conclusion We have seen that there is a dose rate dependence that we have characterised for 6MV and 6FFF. This dependence is non-linear and affects more at lower dose rates. It has been shown that this rate dependence can significantly affect the gamma analysis of patient QA measurements, so calibration to the optimal dose rate for each patient is essential to yield the best possible results.

PO-1788 small field electron beams: measurement based validation of the Monte Carlo calculation algorithm.

G. pittomvils 1 , E. traneus 2 , F. vanhoutte 1

1 Ghent University Hospital, Radiotherapy-Oncology, Gent, Belgium; 2 Raysearch Laboratories AB, Research & Development, Stockholm, Sweden Purpose or Objective The validation of Monte Carlo (MC) based calculation algorithms for standard electron beams (E-beam) has been reported using different methods (1-6). For small field E-beams, where no lateral electron equilibrium (LSE) is obtained (7), dosimetric characterization is reported using dedicated detectors (8). We introduced small field E-beams using a similar validation process. In parallel, the obtained data is used to validate the MC Beam model for those fields.