ArticleMedical physics2025
Impact of magnetic fields on small field dosimetry for parallel MR-linacs.
Article in Medical physics, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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Who cites it
3 citing papers in PubMed.
- Enhancement of electron beam conformity in MRI-guided radiotherapy with parallel magnetic fields: a Monte Carlo analysis.Radiological physics and technology · 2026Article
- Development and validation of a TOPAS Monte Carlo model for a 0.5 T bi-planar Linac-MR.Medical physics · 2026Article
- Impact of magnetic fields on small field dosimetry for parallel MR-linacs.Medical physics · 2025Article
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Abstract
backgroundThe use of MR-guided radiation therapy (MRgRT) is increasing with the introduction of commercially-available parallel MR-linac systems. Treatment fields used by these machines can be very small and highly modulated. Literature on the small field dosimetry of parallel MR-linacs and the impact of the magnetic field on dose perturbations is scarce. PURPOSE: To investigate the impact of magnetic fields on small field dosimetry of parallel MR-linacs using Monte Carlo (MC) methods.
methodsA TOPAS MC model of a 6 MV FFF beam was developed and validated against a commercial 0.5 T parallel MR-linac. The impact of varying magnetic field of up to 3.0 T on water phantom dosimetry such as percent depth dose (PDD), beam profiles, and output factors (OFs) was studied. A lung phantom with embedded spherical tumors of diameters 1-3 cm was employed to investigate the impact of parallel magnetic fields on lung lesions using an arc delivery with a 4
resultsNegligible differences were noted in the PDD, except for the build-up region, between the investigated parallel magnetic fields. Besides the tail region of the 1.5 and 3.0 T profiles, minimal differences were observed in the lateral beam profiles. Similarly, parallel magnetic fields of up to 1 T had a negligible impact on small field OFs. Compared to the 0 T magnetic field, the OF for field sizes of <2 × 2 cm
conclusionsThe impact of parallel magnetic fields of up to 1.0 T strength is minimal for in-water small field dosimetry. However, the increase in OF, compared to the 0 T case, was found to be significant for the 3.0 T magnetic field. For all field strengths compared to 0 T, significant dose differences were found around the periphery of the tumors inside a lung phantom that must be accounted for during treatment planning and dosimetry.
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