The remove holes function was used from a dialog where selected regions of interest (roi) where displayed in a list with a scrollbar.The roi representing the couch was the active roi when opening the dialog and therefore selected as default in the dialog, but it was not visible without scrolling.The user selected the roi for which remove holes was intended, but did not see that the couch roi was also selected.As a result, the interior opening of the couch roi was removed.The incorrect couch roi was not properly reviewed before approval and was used during planning and dose calculation.As plan qa was performed without the couch, the dose deviation was not detected.Patient was treated with ~5% more dose than intended for all fractions.Device functions as designed, but usability improvements will be made for future versions.
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