ArticleJournal of applied clinical medical physics2025
Assessment of the backscattered skin dose from the beam stopper on Halcyon and Ethos radiotherapy systems.
Article in Journal of applied clinical medical physics, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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Who cites it
1 citing paper in PubMed.
- Assessment of the backscattered skin dose from the beam stopper on Halcyon and Ethos radiotherapy systems.Journal of applied clinical medical physics · 2025Article
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5 authors.
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No grant is acknowledged in the PubMed record.
Abstract
backgroundThe backscatter contribution from the beam stopper to the exit-side skin dose on the Halcyon and Ethos radiotherapy systems has not been studied, and this contribution cannot be separated by experimental methods. PURPOSE: This study aimed to assess how the beam backscatter from the beam stopper contributes to the exit-side skin dose.
methodsThe beam stopper and a simplified model of the bore and MV imager were implemented in a validated Monte Carlo model of Halcyon and Ethos radiotherapy systems. To analyze the worst-case scenarios of the backscatter, the largest field size was used, and the dose deposition in a water phantom was calculated with four different phantom setups, varying the distance from the bore and the beam stopper. The backscatter contribution to the dose was isolated, and the spectral properties of the backscattered photons were analyzed for one phantom setup.
resultsThe depth dose curves and the separated backscatter contribution were presented, with a maximum backscatter contribution of 2% of the local dose at the exit-side skin dose observed when the phantom was closest to the bore and the beam stopper.
conclusionsThe backscatter contribution to the skin dose was found to be minimal, even with the largest field size and the phantom positioned extremely close to the bore.
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