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Figure 3
The known vertical offset between the centre of the mask and BDA is illustrated. The BDA is fixed to the DynamicMRT table and is set in height such that it is fully illuminated by the synchrotron beam. The vertical mask position is set by the scanning wedge, and, due to its small range of motion, cannot be adjusted vertically. Therefore, the ballbearing must be vertically shifted to sit within the centre of the mask, as this ultimately defines the field that is delivered to the patient.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 29| Part 4| July 2022| Pages 1074-1084
https://doi.org/10.1107/S1600577522004829
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