ArticleMedical physics2026
Development and validation of a TOPAS Monte Carlo model for a 0.5 T bi-planar Linac-MR.
Article in Medical physics, 2026. 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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1 citing paper in PubMed.
- Development and validation of a TOPAS Monte Carlo model for a 0.5 T bi-planar Linac-MR.Medical physics · 2026Article
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7 authors.
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Abstract
backgroundMR-guided radiotherapy enables real-time imaging and adaptive treatment but may introduce magnetic field effects that alter dose deposition. Accurate dose calculation in such settings requires detailed Monte Carlo (MC) modeling. PURPOSE: To develop and validate a detailed MC model of the 0.5 T bi-planar Linac-MR with an integrated, custom-designed multileaf collimator (MLC) module in TOPAS.
methodsA MC Model of the 0.5 T bi-planar Linac-MR with a 6 MV FFF beam, commercialized as the Aurora-RT (MagnetTx Oncology Solutions, Canada), is developed in TOPAS. A custom 3D magnetic field vector map, tracking with gantry angle, is incorporated into this TOPAS model. An electron source is used for X-ray generation, and all components of the linac head from the target downward are modeled in detail. The MLCs are modeled from stereolithography (STL) design files and controlled via an empirically driven mechanism developed in this work. Water tank measured percent depth dose (PDD) curves and profiles (3
resultsA 5.5 MeV electron source energy and a 1.3 mm radial distribution (FWHM) provides the best match between measurement and MC. Simulated PDDs pass 1%
conclusionsThe developed TOPAS MC model of the 0.5 T Linac-MR demonstrates high accuracy for dose verification in magnetic fields. The MLC module, including its coordinate positioning mechanism, is fully validated for open aperture applications. This MC model provides a reliable framework for dose simulations in a magnetic field.
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