We are wondering if any users of Cranial and Spine SRS Element (VMAT) have any experience they can share in adjustment of the Leaf Shift Dynamic or the Tongue and Groove Size values in the machine profile?
We have seen some deterioration in our VMAT QA film results when the modulation is high in these Elements. Our hypothesis is that this is a result of suboptimal MLC parameters.
Brainlab has suggested that for VMAT the Leaf Shift Dynamic radio button in the Accelerator Settings tab (listed under Radiological Leaf Shift for VMAT Treatments) should be selected instead of Leaf Shift Static and that doing so may improve QA results
It is very challenging to get information on this so any help would be GREATLY appreciated.