Forums › SGRT – Best Practice › Optimal ROI in FB setup to minimize displacement between vertebra and sternum › Reply To: Optimal ROI in FB setup to minimize displacement between vertebra and sternum
To potentially end this topic I would like to say that during this spring we will routinely create two/three different isocenter ROIs for FB breast/chest wall patients for clinical study. We continue with the opposite T- ROI which covers small medial part of the breast laterally, but after couch shifts are done based on kV/kV online match (and before vrt- surface for the treatment is taken) we take a snapshots in the three first fractions of those “competing” other ROIs to see how much RTDs differs between ROIs and which agrees best with the presented online matches. I suppose that this is not any new behavior for the users worldwide to adjust the ROIs in the first fractions but this kind of data with the real patients is minimal. Of course way to think the accuracy of the treatment is different between units and thereby the ROI that is suitable for some units ideology argues with the other units ideology.