Beam output checks of a commercial high-field magnetic resonance-guided radiotherapy machine with its on-board megavoltage imager. (January 2023)

• Record Type: Journal Article
• Authors: Hilgers, Guido C.; Ikink, Marijke; Potters, Ilona; Schuring, Danny
• Is Part Of: Physics and imaging in radiation oncology. Volume 25(2023)
• Publication Date: 2023-01
• Subjects: Radiotherapy -- Quality assurance -- MRI-Linac -- Unity -- Dosimetry -- MV imager; Radiotherapy -- Periodicals; Radiation dosimetry -- Periodicals; Cancer -- Imaging -- Periodicals; Oncology -- Periodicals; 615.842
• DOI: 10.1016/j.phro.2023.100411
• Languages: English
• ISSNs: 2405-6316

Abstract

Abstract: Beam output checks of a commercial high-field magnetic resonance-guided radiotherapy machine can be performed with its on-board megavoltage imager (MVI). This is a fast and efficient method, but only recommended for daily checks. The aim of our study was to show its suitability for weekly checks by investigating its long-term agreement with the golden standard: ionization chamber measurements in a water tank. For one year, the output deviations obtained with both methods were compared. The difference was 0.1 ± 0.3 (1SD) percentage point. This indicated an excellent agreement, and translated into a tolerance level of ± 2 %.