ArticleJournal of applied clinical medical physics2024
Out of field scatter from electron applicator in modern linear accelerators.
Article in Journal of applied clinical medical physics, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Detection of the Linac Jaw face angle misalignment using high energy electron beam symmetry.Journal of applied clinical medical physics · 2025Article
- Characteristics of the electron beam outside the applicator in an Elekta Versa HD Linac.Physical and engineering sciences in medicine · 2025Article
- Article
- Out of field scatter from electron applicator in modern linear accelerators.Journal of applied clinical medical physics · 2024Article
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Authors and funding
5 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundElectron out-of-field scatter is generally not given importance mainly in electron fields. However, this is important when applicator down and boost treatments are given usually at an angle from the central axis. The electron scatter dose is found to be far away from the central axis which could be easily ignored. PURPOSE: This study aims to investigate the out-of-field radiation doses from electron applicators and their effects on clinical treatment. By identifying the parameters that contribute to out-of-field doses and to explore potential strategies for reducing these doses in order to improve patient outcomes from modern machines.
methodsMeasurements were performed in water phantom using electron diode for modern Elekta and Varian machines. Dose profiles were acquired at surface and d
resultsThe scatter dose peaks were found at a distance between 11 and 28 cm from the central axis on all machines. However, the peak shifts to 15 cm at 90° collimator when beam is tilted. The position and intensity of the dose varies with depth, collimator, and gantry angles for both Elekta and Varian machines. Due to clearance issues more gantry angles were studied for Elekta applicator compared to Varian. In general, Varian TrueBeam has a lower scatter that Elekta Infinity. The 90° collimator angle has a higher scatter compared to zero degree for both machines.
conclusionsThere are clinically significant peripheral doses around 3% of the central axis dose from the electron applicator. Elekta has a slightly higher scatter (3%) than Varian (2%) that peaks at 25 cm which is clinically important but often overlooked.
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