Bidirectional scan-based velocity scheduling algorithm for proton arc gantry with limited jerk

作者：Songlan Zhou, Qingkun Fan, Yujia Qian, Riao Dao, Xiliang Lu, Zhijian Yang, Xuanfeng Ding, Gang Peng, Sheng Zhang, Kunyu Yang, Yu Wang, Gang Liu, Shuyang Dai · 发表于：Physics in Medicine and Biology · 年份：2025 · DOI：10.1088/1361-6560/ae0238 · 被引用次数：1 · 研究领域：Radiation Therapy and Dosimetry、Advanced Radiotherapy Techniques、Boron Compounds in Chemistry

Abstract Objective . Spot-scanning proton arc therapy (SPArc) is an innovative planning and delivery framework for proton arc therapy that achieves conformal dose distribution via the rotating gantry. The clinical implementation of SPArc relies on efficient treatment delivery and smooth gantry rotation, with gantry velocity scheduling playing a crucial role in addressing this challenge. This study proposes a bidirectional scan-based gantry velocity scheduling algorithm, designated as BD SPArc , to enhance the delivery efficiency and generate smooth gantry velocity profiles for SPArc plans concerning the mechanical and clinical requirements. Approach . For a given SPArc plan, BD SPArc generates the gantry velocity profile by determining maximum feasible gantry velocities that allow sufficient time for irradiation and energy layer switch based on a bidirectional scan procedure. The profile with limited jerk (time derivative of acceleration) is then used to connect the velocities at the adjacent gantry angles. The SPArc delivery sequence model (DSM SPArc ) was used as a benchmark. SPArc plans for nine clinical cases, including brain, liver, lung, prostate, and head & neck cancers, were utilized for the evaluation. The performance of BD SPArc was evaluated based on the dynamic delivery time, the lost time (the difference between the dynamic delivery time and the fix beam delivery time), and the or...