Hi,
Just want to bump this to the top now that the weekend is over!
Thanks for any insights about the CSF estimation, Adam
On Fri, Oct 21, 2016 at 1:03 PM, Adam Martersteck acmarter@gmail.com wrote:
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
On Thu, Oct 20, 2016 at 3:24 PM, Douglas N Greve < greve@nmr.mgh.harvard.edu> wrote:
What do you mean? You have your own CSF segmentation and you want to use that instead of the one created by gtmseg?
On 10/20/2016 11:32 AM, Adam Martersteck wrote:
Hi FreeSurfer team,
Hopefully Doug or someone familiar with the new PET PVC implementation can answer a few things I can't seem to find on http://surfer.nmr.mgh.harvard.edu/fswiki/PetSurfer or either of Doug's PVC publications (2013 or 2016).
- Is the choroid plexus included in the binarized then 3mm eroded
segmentation to find the mean ventricular CSF signal?
- Is there a way to input my own estimation of ventricular CSF signal
to mri_gtmpvc?
Thanks! Adam
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