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ASSESSMENT OF AMBIENT NEUTRON DOSE EQUIVALENT IN SPATIALLY FRACTIONATED RADIOTHERAPY WITH PROTONS USING PHYSICAL COLLIMATORS.
Radiation Protection Dosimetry ( IF 0.8 ) Pub Date : 2020-07-13 , DOI: 10.1093/rpd/ncaa030
Serdar Charyyev 1 , C-K Chris Wang 2
Affiliation  

New technique is trending in spatially fractionated radiotherapy with protons to utilize the spot scanning together with a physical collimator to obtain minibeams. The primary goal of this study is to quantify ambient neutron dose equivalent (${H}^{\ast }(10)$) due to the secondary neutrons when physical collimator is used to achieve desired minibeams. The ${H}^{\ast }(10)$ per treatment proton dose (D) was assessed using Monte Carlo code TOPAS and measured using WENDI-II detector at different angles (135, 180, 225 and 270 degrees) and distances (11 cm, 58 and 105 cm) from the phantom for two cases: with and without physical collimation. Without collimation $\frac{H^{\ast }(10)}{D}$ varied from 0.0013 to 0.242 mSv/Gy. With collimation $\frac{H^{\ast }(10)}{D}$ varied from 0.017 to 3.23 mSv/Gy. Results show that the secondary neutron dose will increase tenfold when the physical collimator is used. Regardless, it will be low and comparable to the neutron dose produced by conventional passive-scattered proton beams.

中文翻译:

使用物理准直器对质子空间分割放射治疗中的环境中子剂量当量进行评估。

新技术正在使用质子进行空间分割放射治疗,以利用点扫描与物理准直器一起获得微型光束。这项研究的主要目标是量化环境中子剂量当量 (${H}^{\ast }(10)$),当使用物理准直器来实现所需的微型光束时,由于二次中子。${H}^{\ast }(10)$ 每个治疗质子剂量 (D) 使用蒙特卡罗代码 TOPAS 进行评估,并使用 WENDI-II 检测器在不同角度(135、180、225 和 270 度)和距离测量(11 厘米、58 和 105 厘米)两种情况下的体模:有和没有物理准​​直。在没有准直的情况下,$\frac{H^{\ast }(10)}{D}$ 从 0.0013 到 0.242 mSv/Gy 不等。随着准直,$\frac{H^{\ast }(10)}{D}$ 从 0.017 到 3.23 mSv/Gy 不等。结果表明,当使用物理准直器时,二次中子剂量将增加十倍。无论如何,它将是低的并且与传统的被动散射质子束产生的中子剂量相当。
更新日期:2020-03-07
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