Kaviarasu Karunakaran, Nambi Raj N Arunai, Hamid Misba, Giri Babu A Ananda, Sreenivas Lingampally, Murthy Kammari Krishna
Department of Radiation Oncology, Krishna Institute of Medical Sciences, Secunderabad, India.
Department of Physics, School of Advanced Sciences, VIT University, Vellore, India.
J Med Phys. 2017 Oct-Dec;42(4):258-265. doi: 10.4103/jmp.JMP_16_17.
The purpose of this study is to verify the accuracy of the commissioning of intensity-modulated radiation therapy (IMRT) and volumetric-modulated arc therapy (VMAT) based on the recommendation of the American Association of Physicists in Medicine Task Group 119 (TG-119).
TG-119 proposes a set of clinical test cases to verify the accuracy of IMRT planning and delivery system. For these test cases, we generated two sets of treatment plans, the first plan using 7-9 IMRT fields and a second plan utilizing two-arc VMAT technique for both 6 MV and 15 MV photon beams. The template plans of TG-119 were optimized and calculated by Varian Eclipse Treatment Planning System (version 13.5). Dose prescription and planning objectives were set according to the TG-119 goals. The point dose (mean dose to the contoured chamber volume) at the specified positions/locations was measured using compact (CC-13) ion chamber. The composite planar dose was measured with IMatriXX Evaluation 2D array with OmniPro IMRT Software (version 1.7b). The per-field relative gamma was measured using electronic portal imaging device in a way similar to the routine pretreatment patient-specific quality assurance.
Our planning results are compared with the TG-119 data. Point dose and fluence comparison data where within the acceptable confident limit.
From the obtained data in this study, we conclude that the commissioning of IMRT and VMAT delivery were found within the limits of TG-119.
本研究的目的是根据美国医学物理学家协会任务组119（TG - 119）的建议，验证调强放射治疗（IMRT）和容积调强弧形治疗（VMAT）调试的准确性。
TG - 119提出了一组临床测试病例，以验证IMRT计划和输送系统的准确性。对于这些测试病例，我们生成了两组治疗计划，第一组计划使用7 - 9个IMRT射野，第二组计划对6 MV和15 MV光子束均采用双弧VMAT技术。TG - 119的模板计划由瓦里安Eclipse治疗计划系统（版本13.5）进行优化和计算。剂量处方和计划目标根据TG - 119的目标设定。使用紧凑型（CC - 13）电离室测量指定位置/部位的点剂量（对勾画的腔室体积的平均剂量）。使用带有OmniPro IMRT软件（版本1.7b）的IMatriXX Evaluation 2D阵列测量复合平面剂量。使用电子射野成像装置以类似于常规预处理患者特定质量保证的方式测量每个射野的相对γ值。
将我们的计划结果与TG - 119数据进行比较。点剂量和注量比较数据在可接受的置信限内。
从本研究获得的数据来看，我们得出结论，IMRT和VMAT输送的调试结果在TG - 119的限制范围内。
