mustafa Karim benhacene boudam
Hi, just to be sure i understand your workflow.
You are using the same patient set up in the CT room and you are performing a FB scan and then a DIBH scan.
Then you export the FB and DIBH scans in eclipse, you optimize 2 plans (thats why you say 2 isocenters) and then you compare the dosimetries to decide if the DIBH plan is best for your patient.
In eclipse your 2 scans should be in the same frame of reference and the spine of the 2 scans should be matched. Right? If so, all you have to do is copy the BODY structure of the FB scan on your DIBH structure set and rename it FB BODY or something like that. That way you will have 2 Bodies, one used for the dosimetry (the DIBH one) and one coming from the FB scan.
Once you export your plan on VRT you will have 1 isocenter coming from the plan but you will create 1 FIELD for the FB contour and 1 FIELD for the DIBH contour. Both fields will be under the same isocenter course. That way during the treatment you can position your patient in FB and then treat in DIBH.