Performance of a cylindrical diode array for use in a 1.5 T MR-linac. (15th January 2016)

• Record Type: Journal Article
• Authors: Houweling, A C; de Vries, J H W; Wolthaus, J; Woodings, S; Kok, J G M; van Asselen, B; Smit, K; Bel, A; Lagendijk, J J W; Raaymakers, B W
• Is Part Of: Physics in medicine & biology. Volume 61:Number 3(2016:Feb.)
• Page Start: N80
• Page End: N89
• Publication Date: 2016-01-15
• Subjects: radiotherapy -- MR-linac -- ArcCHECK-MR -- MRI-accelerator -- ArcCHECK -- plan verification -- patient specific QA; Biophysics -- Periodicals; Medical physics -- Periodicals; 610.153
• DOI: 10.1088/0031-9155/61/3/N80
• Languages: English
• ISSNs: 0031-9155

Abstract

Abstract: At the UMC Utrecht, a linear accelerator with integrated magnetic resonance imaging (MRI) has been developed, the MR-linac. Patient-specific quality assurance (QA) of treatment plans for MRI-based image guided radiotherapy requires QA equipment compatible with this 1.5 T magnetic field. The purpose of this study was to examine the performance characteristics of the ArcCHECK-MR in a transverse 1.5 T magnetic field. To this end, the short-term reproducibility, dose linearity, dose rate dependence, field size dependence, dose per pulse dependence and inter-diode dose response variation of the ArcCHECK-MR diode array were evaluated on a conventional linac and on the MR-linac. The ArcCHECK-MR diode array performed well for all tests on both linacs, no significant differences in performance characteristics were observed. Differences in the maximum dose deviations between both linacs were less than 1.5%. Therefore, we conclude that the ArcCHECK-MR can be used in a transverse 1.5 T magnetic field.