Monte Carlo simulations of out-of-field surface doses due to the electron streaming effect in orthogonal magnetic fields

Physics in Medicine and Biology
Victor N MalkovBram van Asselen

Abstract

The out-of-field surface dose contribution due to backscattered or ejected electrons, focused by the magnetic field, is evaluated in this work. This electron streaming effect (ESE) can contribute to out-of-field skin doses in orthogonal magnetic resonance guided radiation therapy machines. Using the EGSnrc Monte Carlo package, a phantom is set-up along the central axis of an incident 10 [Formula: see text] 10 cm2 7 MV FFF photon beam. The phantom exit or entry surface is inclined with respect to the magnetic field, and an out-of-field water panel is positioned 10 cm away from, and centered on, the isocenter. The doses from streaming backscattered or ejected electrons, for either a 0.35 T or 1.5 T magnetic field, are evaluated in the out-of-field water panel for surface inclines of 10, 30, and 45°. The magnetic field focuses electrons emitted from the inclined phantom. Dose distributions at the surface of the out-of-field water panel are sharper in the 1.5 T magnetic field as compared to 0.35 T. The maximum doses for the 0.35 T simulations are 23.2%, 37.8%, and 39.0% for the respective 10, 30, and 45° simulations. For 1.5 T, for the same angles, the maximum values are 17.1%, 29.8%, and 35.8%. Dose values drop to below 2% within ...Continue Reading

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Citations

Aug 28, 2020·Frontiers in Oncology·Maureen L Groot KoerkampAnna M Kirby
Jan 22, 2021·Technology in Cancer Research & Treatment·Shouliang DingXiaoyan Huang
Jul 19, 2021·Journal of Applied Clinical Medical Physics·Simon J WoodingsJochem W H Wolthaus
Oct 27, 2021·Physics in Medicine and Biology·Bin YangSiu Ki Yu

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