Thanks for the responses everyone. Lindsey, you mentioned issues using AlignRT for CBCT where the imaging arms are out. A similar issue I’ve seen for VMAT or IMRT breast treatments is the deltas change as the gantry blocks the camera on the ipsilateral side. Our strategy has been to increase the ROI to extend beyond midline and include some of the contralateral breast. Have others tried this and is that a recommended solution to this issue? Would it be possible to create a separate ROI to use during the CBCT in a similar way? With both kV arms out it might obscure the cameras too much to compensate with a larger ROI though. Has anyone tried that or found ways around this issue?