Hey Lauren. Hope you are doing well. Good to see you on here.
We have moved all of our DIBH electron boosts to the free breathing scans as the others have indicated. If we feel the boost absolutely needs to happen on the DIBH scan we will setup as usual using the free breathing scan, have them take in a deep breath to the breath hold surface, then insert the cone and snap a new reference under a new boost field. That reference basically tells you what the cameras can and can’t see and you can set your ROI appropriately for monitoring. I can say since we stopped using the DIBH scan for boosts we have probably only “needed” to do this 1-3 times in 3+ years.