X-ray beam quality checks of a magnetic resonance-guided linear accelerator with its on-board megavoltage imager
Publication date
2026-01
Authors
Hilgers, Guido C.
Woodings, Simon J.
Foppen, Thomas A.
Wolthaus, Jochem W.H.
van Asselen, Bram
Minken, André W.
Raaymakers, Bas W
Editors
Advisors
Supervisors
Document Type
Article
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License
cc_by_nc_nd
Abstract
This study presents a method for fast and low-cost X-ray beam quality checks of magnetic resonance-guided radiotherapy (MRgRT) linacs using the on-board megavoltage imager (MVI). On four linacs from two clinics, beam quality was varied (quantified by ionization chamber measurements) and correlated with MVI-measured beam flatness. Both inter-linac consistency and long-term repeatability were demonstrated. The model developed for MVI-based beam quality checks was assessed in clinical practice and can be implemented on any linac of the same type for use in daily, automated dosimetry checks.
Keywords
Dosimetry, MRI-Linac, MV imager, Quality assurance, Radiotherapy, Unity, Radiation, Oncology, Radiology Nuclear Medicine and imaging
Citation
Hilgers, G C, Woodings, S J, Foppen, T A, Wolthaus, J W H, van Asselen, B, Minken, A W & Raaymakers, B W 2026, 'X-ray beam quality checks of a magnetic resonance-guided linear accelerator with its on-board megavoltage imager', Physics and Imaging in Radiation Oncology, vol. 37, 100930. https://doi.org/10.1016/j.phro.2026.100930