Feasibility of a Tungsten Rubber Grid Collimator for Electron Grid Therapy
Feasibility of a Tungsten Rubber Grid Collimator for Electron Grid Therapy
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DOI：
10.21873/anticanres.13407
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发表时间：
2019-06-01
影响因子：
2
通讯作者：
Monzen, Hajime
中科院分区：
文献类型：
--
作者：
Kijima, Kenta;Krisanachinda, Anchali;Monzen, Hajime
背景/目的：空间分割放射治疗（网格治疗）可以控制一些巨大的肿瘤，这是传统放射治疗的挑战。本研究旨在探讨一种新型的钨橡胶（TCR）栅极准直器是否可以用于电子栅极治疗。材料与方法：将TCR栅控准直器置于固体水模体上，用Gafchromic EBT 3胶片测量了9 MeV电子束的深度剂量和侧向剂量分布。在横向剂量分布中，评价了有和无屏蔽区的剂量比（谷峰比）。结果如下：1、2和3 mm TCR网格准直器的d（max）值分别为1.2、1.1和0.7 cm，而每个d（max）处的谷峰比分别为0.566、0.412和0.293。结论：与传统的格栅准直器相比，只有2 mm TCR格栅准直器具有足够的剂量学特征，可以替代。
Background/Aim: Spatially fractionated radiotherapy (grid therapy) can control some bulky tumors which is challenging for conventional radiotherapy. This study aimed to investigate whether a novel tungsten contained rubber (TCR) grid collimator can be employed in electron grid therapy. Materials and Methods: The TCR grid collimator placed on a solid water phantom, and percentage depth doses (PDDs) and lateral dose profiles were measured for 9 MeV electron beam with Gafchromic EBT3 films. At the lateral dose profile, the ratios of the dose in the areas with and without shielding (valley-to-peak ratios) were evaluated. Results: The d(max) values with the 1, 2 and 3 mm TCR grid collimators were 1.2, 1.1 and 0.7 cm, respectively, while the valley-to-peak ratios at each d(max) were 0.566, 0.412 and 0.293, respectively. Conclusion: Only the 2 mm TCR grid collimator had adequate dosimetric features compared to the conventional grid collimator and could be substituted.