A follow-up question regarding SGRTuesdays June 2026:
How to incoporate couch walkout and gantry occulusine?
-- Asad Yousuf
If we move the treatment couch to a floor angle after taking our CBCTs and Align RT is showing us a long move on the translations we would bring the couch back to zero and the gantry to zero. If all our rotations and translations are in tolerance we will move the floor to the desired angle and then move the gantry. If the translations are still showing a change in the Long we will extend the tolerance to allow it to be treated. (If it was a significant long move we would reset the patient fully to rule out any set up issues) If the translations were out of tolerance when we had returned the gantry and floor to zero we would reimage the patient. We also use this pathway for gantry occlusion. If we are treating and the gantry causes block during treatment we will interrupt the field and bring the gantry up to Zero. this should show if it is the gantry causing the block, this would also be evident on reviewing your ROI and checking if any of the ROI is not getting picked up. A dry run of the floor angles and the gantry positions before the treatment begins can also help you to predict where you will expect to have block during the treatment arcs. This is also very helpful to document for future fractions or if unfamiliar staff are treating.