International Journal of Particle Therapy
Purpose: Introduce an experimental approach to model a precise prototype arc system and quantitatively assess its efficiency improvement in the routine proton clinical operation. Methods: The SPArc delivery sequence model(DSMSPArc) includes two kinds of parameters:(1) mechanical parameters. (2) irradiation parameters. Log files and an independent gantry inclinometer were used to derive the irradiation parameters through a series of test plans. The in-house DSMSPArc was established by fitting both mechanical and irradiation parameters. Eight SPArc plans from different disease sites were used to validate the model’s accuracy. To assess the treatment efficiency improvement, the DSMSPArc was used to simulate the SPArc treatment delivery sequence and compared to the clinical IMPT treatment logfiles from the two full clinical days. Results: The relative difference of treatment time between log files and DSMSPArc‘s prediction was 6.1%63.9% on average, and the gantry angle vs. delivery time showed a good agreement between the DSMSPArc and log file (Figure 1). Additionally, the SPArc plan could effectively save two hours out of ten hours of clinical operation by simplifying the treatment workflow for a single room proton therapy center. The average treatment delivery time (including gantry rotation and irradiation) per patient was reduced to 2266149s using SPArc compared to 6656407s using IMPT (p,0.01). Conclusion: SPArc can offer a superior delivery efficiency to improve daily patient treatment throughput, compared to IMPT. Most importantly, this model helps the community to further develop and investigate this merging technqieu especially incorporating the arc delivery speed and time into the SPArc optimization algorithm
Ding X, Liu G, Zhao L, Deraniyagala R, Stevens C, Yan D, Li X. The First modeling of the spot-scanning proton arc (SPArc) delivery sequence and investigating its efficiency improvement. Int J Part Ther. 2022 Spring;8(4):97.