Document Type

Conference Proceeding

Publication Date


Publication Title

Medical Physics


Purpose: To assess the efficiency improvement of SPArc compared to IMPT in proton clinical operation.Methods: A random clinical operation day at a proton therapy center with a two room system. Aa total of 10 Head & Neck cancer cases treated on Jan 6th, 2021were selected and SPArc plans were generated for all the cases with similar target coverage and dose constraints of organ at risk (OARs). 3% range uncertainties and 3mm setup uncertainties were applied for robust optimization. The log files of clinical IMPT were exported to calculate true treatment delivery time. The machine-specific delivery sequence model was utilized to estimate the irradiation time(not including gantry rotation) for the SPArc plan including energy layer switching time(ELST), spot switching time(SSWT) and spot drill time (SDT Results: The target coverage of the SPArc plan group is 97.35±1.56 compared to 97.42±2.28 with the clinical IMPT plan group. Estimated ELST, SSWT, SDT and irradiation time are 237.92±44.93s, 44.68±13.81s ,53.99±22.51s, and 374.37±88.94s, respectively. For the clinical IMPT plan, the real delivery time was 615.73±141.78s. The SPArc plan could save 42.55 mins of clinical operation by simplifying the treatment workflow for ten patients in a two-room proton therapy center. Conclusion: With the similar dose coverage of the target, SPArc has the potential to offer a superior delivery efficiency to improve clinical treatment throughput compared to IMPT. Forward studies are warranted upon clinical deployment of SPArc





First Page



American Association of Physicists in Medicine 65th Annual Conference & Exhibition, July 23-27, 2023, Houston, TX