Thanks for replying Doug,
Yes, I would like to use my own mask if the choroid plexus is included but only for Tau PET. There is high off-target binding of the new tau PET ligand AV1451 (formerly called T807) in choroid plexus. I wanted to avoid that high signal when estimating CSF.
I think choroid plexus being included for all the other types of PET I plan on using (FDG or amyloid PET) is great -- because it bridges the ventricles at the septum pellucidum (intended or not) -- and makes the erosion of 3mm much less 'harsh' because it's eroding from a connected mass of 1 segmentation instead of two independent segmentations (left and right ventricles).
if choroid plexus is not included -- then no worries, I'll continue using it for AV1451 Tau PET just like for amyloid and FDG PET as planned. If it is -- is there a way to expose the CSF estimation in the script so that I could input my own estimation (just the ventricles)?
Thanks!
Adam