A novel approach with quadrupole magnets for precise deflection, scattering and focusing of very high energy electron beams (VHEE)

Mustapha Assalmi , Abdullah Alshreef , Sofia Jebbari , Assia Arectout , Pedro Arce , El Yamani Diaf
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Abstract

A novel approach involving quadrupole magnets has been proposed to deflect and disperse electrons in the irradiation fields, as well as a system for focusing beams at specific depths. This research also presents a comparison between VHEE and conventional radiotherapy, supported by the validation of our Monte Carlo simulations using real measurement data for low-energy electrons (6, 9 and 15 MeV) in water and air, thus ensuring the reliability of our results. Simulations demonstrate high accuracy, with agreement with measurement data of up to 0.58 % and less than 1.86 % for all validated energies and fields. The results show a significant reduction in entrance dose (82.4 %) with focused beams compared to unfocused beams, as well as a 17.6 % reduction at a depth of 30 cm. The study of the spread electron peak (SOEP) for 4 focused beams varies in magnetic field intensity to cover a depth of 11 cm–18 cm, with an entrance dose at a depth of 0.5 mm of 27.15 % and 24.5 % of the exit dose at a depth of 40 cm. The VHEEs also offer the advantage of low Linear Energy Transfer (LET) compared with protons, which reduces the risk of damage several times over.
利用四极磁体实现高能电子束精确偏转、散射和聚焦的新方法
提出了一种涉及四极磁体的新方法来偏转和分散辐射场中的电子,以及在特定深度聚焦光束的系统。本研究还比较了VHEE和传统放射治疗,并利用水和空气中低能电子(6,9和15 MeV)的实际测量数据验证了我们的蒙特卡罗模拟,从而确保了我们结果的可靠性。模拟结果表明,该方法具有较高的精度,与实测数据的符合率可达0.58%,与所有验证能量和场的符合率低于1.86%。结果表明,与未聚焦光束相比,聚焦光束的入口剂量显著降低(82.4%),在30 cm深度处降低了17.6%。研究了4束聚焦光束在11 cm ~ 18 cm范围内磁场强度变化时的展频电子峰(SOEP),在0.5 mm深度处的入口剂量为出口剂量的27.15%,在40 cm深度处为出口剂量的24.5%。与质子相比,VHEEs还具有低线性能量转移(LET)的优势,这将损坏的风险降低了几倍。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
1.70
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