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X-ray beam quality checks of a magnetic resonance-guided linear accelerator with its on-board megavoltage imager
Guido C Hilgers1,2, Simon J Woodings1, Thomas A Foppen1
1Department of Radiotherapy, University Medical Center Utrecht, Utrecht, The Netherlands.
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.
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