The increased inertia of very high-energy electrons (VHEEs) due to relativistic effects reduces scattering and enables irradiation of deep-seated tumours. However, entrance and exit doses are high for collimated or diverging beams. Here, we perform a study based on Monte Carlo simulations of focused VHEE beams in a water phantom, showing that dose can be concentrated into a small, well-defined volumetric element, which can be shaped or scanned to treat deep-seated tumours. The dose to surrounding tissue is distributed over a larger volume, which reduces peak surface and exit doses for a single beam by more than one order of magnitude compared with a collimated beam.
- very high-energy electrons (VHEEs)
- relativistic effects
- Monte Carlo simulations
- deep-seated tumours
Kokurewicz, K., Brunetti, E., Welsh, G. H., Wiggins, S. M., Boyd, M., Sorensen, A., ... Jaroszynski, D. A. (2019). Focused very high-energy electron beams as a novel radiotherapy modality for producing high-dose volumetric elements. Scientific Reports, 9, . https://doi.org/10.1038/s41598-019-46630-w