Roy Soumya, Sarkar Biplab, Pradhan Anirudh
Department of Radiation Oncology, Manipal Hospital, New Delhi, India.
Department of Physics, GLA University, Mathura, Uttar Pradesh, India.
J Med Phys. 2023 Apr-Jun;48(2):204-209. doi: 10.4103/jmp.jmp_56_22. Epub 2023 Jun 29.
An extended version of task group report (TG)-119 dosimetric tests was introduced and tested on the TrueBeam linear accelerator setup. Treatment plan results and quality assurance (QA) results of RapidArc (RA) and intensity-modulated radiotherapy (IMRT) were compared to understand the limitation and efficacy of the RA and IMRT system of the linear accelerator. Test structure sets were drawn on OCTAVIUS four-dimensional (4D) phantom computed tomography scan data for this study. We generated treatment plans based on the specified goal in the Eclipse™ treatment planning system using RA and IMRT in the study phantom. We used the same planning objectives for RA and IMRT techniques. Planar dose verification was performed using electronic portal imaging device and OCTAVIUS 4D phantom. The treatment log file was further analyzed using Pylinac (V2.4.0 (Open Source Code library available on Github, runs under Python programming language)) to compare the dosimetric outcome of RA and IMRT. Dose to the planning target volume (PTV) 1-5 and organ at risk (OAR) were analyzed in this study for the efficiency comparison of RA and IMRT. The primary objective was accomplished by adhering to the dose constraints associated with PTV 2 and the OAR. RA and IMRT also met the secondary objective. The tertiary goal of dose delivery to PTV 4 was met with RA but not IMRT. This study can be utilized to compare different institutions' planning and patient-specific QA (PSQA) procedures. The findings of this study were in line with the published works of the literature. A multi-institutional planning and delivery accuracy audit can be built using this structure and set of planning objectives having similar PSQA phantom. The TG-119 report incorporated test challenges that were combined in a single study set and a single plan. This reduces the complexity of performing the original TG-119 tests, whereas keeping the challenges as introduced in the TG-119 report. This study's planning and dosimetric results could be further utilized for dosimetry audit with any institute having a linear accelerator and OCTAVIUS 4D phantom for PSQA.
介绍了任务组报告（TG）-119剂量学测试的扩展版本，并在TrueBeam直线加速器装置上进行了测试。比较了容积旋转调强放疗（RA）和调强放疗（IMRT）的治疗计划结果和质量保证（QA）结果，以了解直线加速器RA和IMRT系统的局限性和有效性。本研究的测试结构集是根据OCTAVIUS四维（4D）体模计算机断层扫描数据绘制的。我们在研究体模中使用RA和IMRT，基于Eclipse™治疗计划系统中的指定目标生成治疗计划。我们对RA和IMRT技术使用相同的计划目标。使用电子射野影像装置和OCTAVIUS 4D体模进行平面剂量验证。使用Pylinac（V2.4.0（可在Github上获取的开源代码库，在Python编程语言下运行））进一步分析治疗日志文件，以比较RA和IMRT的剂量学结果。本研究分析了计划靶区（PTV）1-5和危及器官（OAR）的剂量，以比较RA和IMRT的效率。通过遵守与PTV 2和OAR相关的剂量约束实现了主要目标。RA和IMRT也达到了次要目标。RA达到了向PTV 4输送剂量的第三目标，而IMRT未达到。本研究可用于比较不同机构的计划和患者特定质量保证（PSQA）程序。本研究结果与文献发表的作品一致。可以使用这种结构和具有类似PSQA体模的一组计划目标来建立多机构计划和交付准确性审核。TG-119报告纳入了在单个研究集和单个计划中组合的测试挑战。这降低了执行原始TG-119测试的复杂性，同时保留了TG-119报告中引入的挑战。本研究的计划和剂量学结果可进一步用于任何拥有直线加速器和用于PSQA的OCTAVIUS 4D体模的机构的剂量学审核。
