基于StereoPHAN幻影的SRS MapCHECK作为SBRT计划新预处理系统验证的评估

IF 0.7 Q4 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
B. Sadowski, Marta Fillmann, Dariusz Szałkowski, P. Kukołowicz
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引用次数: 0

摘要

摘要简介:本研究的目的是评估新型二维二极管阵列SRS MapCHECK (SunNuclear, Melbourne, USA)与专用幻影StereoPHAN (SunNuclear, Melbourne, USA)用于立体定向体放疗(SBRT)的治疗前验证。材料与方法:测定了该系统的短、中长期稳定性、剂量与MU的线性关系、角度依赖性、场大小依赖性(相对输出因子比)。对15例治疗前肿瘤患者(5例脑、5例肺、5例肝)进行SRS MapCHECK和EBT3 Gafchromic膜的验证结果进行比较。使用acros XB (Varian, Palo Alto, USA)剂量计算算法,使用Eclipse (v. 15.6, Varian, Palo Alto, USA)治疗计划系统(TPS)对所有SBRT计划进行优化,并交付给配备高清多叶准直器的Varian EDGE®(Varian, Palo Alto, USA)加速器。采用6MV无压平滤波波束(FFF)。结果:SRS MapCHECK的短、中长稳定性良好(0.1% ~ 0.2%),与MU的剂量线性关系和探测器响应与场大小的依赖关系也可以接受(在最小场为1 × 1 cm2时,microDiamond与SRS MapCHECK的剂量线性关系R2 = 1和6%)。除了接近90°和270°的角度外,角度依赖性很好。对于治疗前计划的验证,采用伽玛方法,标准为剂量差3%,距离一致3mm (3%/ 3mm), 2%/ 2mm, 1%/ 1mm, 3%/ 1mm和2%/ 1mm。在SRS MapCHECK系统上观察到所有标准的最高通过率。结论:结合StereoPHAN的SRS MapCHECK在SBRT方案的预处理验证中具有足够的潜力,可以显著加快立体定向方案的验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation of SRS MapCHECK with StereoPHAN phantom as a new pre-treatment system verification for SBRT plans
Abstract Introduction: The aim of this study was to evaluate the new 2-Dimensional diode array SRS MapCHECK (SunNuclear, Melbourne, USA) with dedicated phantom StereoPHAN (SunNuclear, Melbourne, USA) for the pre-treatment verification of the stereotactic body radiotherapy (SBRT). Material and methods: For the system, the short and mid-long stability, dose linearity with MU, angular dependence, and field size dependence (ratio of relative output factor) were measured. The results of verification for 15 pre-treatment cancer patients (5 brains, 5 lungs, and 5 livers) performed with SRS MapCHECK and EBT3 Gafchromic films were compared. All the SBRT plans were optimized with the Eclipse (v. 15.6, Varian, Palo Alto, USA) treatment planning system (TPS) using the Acuros XB (Varian, Palo Alto, USA) dose calculation algorithm and were delivered to the Varian EDGE® (Varian, Palo Alto, USA) accelerator equipped with a high-definition multileaf collimator. The 6MV flattening-filter-free beam (FFF) was used. Results: Short and mid-long stability of SRS MapCHECK was very good (0.1%-0.2%), dose linearity with MU and dependence of the response of the detector on field size results were also acceptable (for dose linearity R2 = 1 and 6% difference between microDiamond and SRS MapCHECK response for the smallest field of 1 × 1 cm2). The angular dependence was very good except for the angles close to 90° and 270°. For pre-treatment plan verification, the gamma method was used with the criteria of 3% dose difference and 3 mm distance to agreement (3%/3 mm), and 2%/2 mm, 1%/1 mm, 3%/1 mm, and 2%/1 mm. The highest passing rate for all criteria was observed on the SRS MapCHECK system. Conclusions: It is concluded that SRS MapCHECK with StereoPHAN has sufficient potential for pre-treatment verification of the SBRT plans, so that verification of stereotactic plans can be significantly accelerated.
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来源期刊
Polish Journal of Medical Physics and Engineering
Polish Journal of Medical Physics and Engineering RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-
CiteScore
1.30
自引率
0.00%
发文量
19
期刊介绍: Polish Journal of Medical Physics and Engineering (PJMPE) (Online ISSN: 1898-0309; Print ISSN: 1425-4689) is an official publication of the Polish Society of Medical Physics. It is a peer-reviewed, open access scientific journal with no publication fees. The issues are published quarterly online. The Journal publishes original contribution in medical physics and biomedical engineering.
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