ESTRO 2024 - Abstract Book

S4691

Physics - Optimisation, algorithms and applications for ion beam treatment planning

ESTR0 2024

The final result of this work is the semi-automated workflow allowing to perform PSQA based on machine log files using GPU-accelerated FRED MC code in the following steps: (i) patient treatment plan export form Varian Eclipse 16.1 treatment planning system (including CT DICOM, RS DICOM, RT Plan, RT Dose), (ii) single plan irradiation for plan executability check and machine log files collection, (iii) log file conversion to dummy RT plan and MC simulation with FRED MC code, and (iv) comparison of dose distribution calculated with TPS and FRED MC code (Fig. 1).

Fig. 1. Comparison between dose distribution calculated in TPS Varian Eclipse 16.1 and recalculated in FRED MC based on log files.

Conclusion:

With the developed log-file interpreter and improved beam model, FRED MC can be used as an independent dose recalculation engine based on the beam parameters logged during treatment plan irradiation. The log-file based PSQA protocol with improved beam modeling capacity, as presented in this work, allows for limiting the beamtime needed for PSQA. It is expected that the full replacement of MatriXX PT measurement with log-based FRED MC simulation could decrease the beamtime needed for PSQA by about 500 hours/year.

Keywords: log based PSQA, FRED Monte Carlo, Proton therapy

References:

1. Schiavi, A., Senzacqua, M., Pioli, S., Mairani, A., Magro, G., Molinelli, S., ... & Patera, V. (2017). Fred: a GPU-accelerated fast-Monte Carlo code for rapid treatment plan recalculation in ion beam therapy. Physics in Medicine & Biology, 62(18), 7482