Dear Michel,
Given your resolution 0.8x0.8x0.8, did you run recon-all with -hires flag? What
did you used T2 image for? As a -T2pial refinement? T2 image is not used for
hippocampal segmentation in standard recon-all stream.
But pay attention that with -hires you also have to alter default value for
mris_inflate, as specified here
http://freesurfer.net/fswiki/SubmillimeterRecon
In my case -n was not enough, I would recommend -n 50 (more does not do any
harm).
In any case, I would recommend to try hippocampal subfields module.
https://surfer.nmr.mgh.harvard.edu/fswiki/HippocampalSubfields
This should be more precise than "standard" aseg segmentation and given you
have also 3D T2, multispectral T1 and T2 segmentation can be used.
Antonin Skoch
Dear Shane,
I have checked the aseg.mgz and in only one I would say the segmentation failed
however the others look fine and I'm taking the measurements from the text file
that is generated from the aseg.stats.
Should I redo the recon-all with a different input? I have always given
freesurfer T1 and a T2 scan to process both having a resolution of 0.8x0.8x0.8
mm.Sincerely,
Michel Hu
________________________________
Van: freesurfer-boun...@nmr.mgh.harvard.edu
<freesurfer-boun...@nmr.mgh.harvard.edu> namens Shane S
<shane.schofi...@yahoo.com>
Verzonden: maandag 27 februari 2017 11:15
Aan: Freesurfer support list
Onderwerp: Re: [Freesurfer] Overestimation of volume in Hippocampus
Hi Michel Hu,
Yes, that’s too large for MCI or even controls for that matter I think. Have
you checked the aseg.mgz? I generally find that the hippocampus is well
segmented, even in patients with a lot of atrophy.
Are you taking the measurements with the asegstats2table?
Sincerely,
--
Shane S
On 27 February 2017 at 10:12:09, Michel Hu (a...@live.nl<mailto:a...@live.nl>)
wrote:
Dear Shane,
I apologize for not being clear. The reported value is of only one half of the
hippocampus.
I have only run 4 subjects of the 75 however they all have a reported value of
between 6000 to 10000 mm^3 summed together for the hippocampus.
Sincerely,
Michel Hu
________________________________
Van: freesurfer-boun...@nmr.mgh.harvard.edu
<freesurfer-boun...@nmr.mgh.harvard.edu> namens Shane S
<shane.schofi...@yahoo.com>
Verzonden: maandag 27 februari 2017 11:00
Aan: Freesurfer support list
Onderwerp: Re: [Freesurfer] Overestimation of volume in Hippocampus
Hi Michel Hu,
Is that a summed value of left and right hippocampus? That seems normal to me
since averaged total hippocamppal volumes for MCI have been typically reported
at around 2500-3500mm3.
Thanks,
--
Shane S
On 27 February 2017 at 09:44:27, Michel Hu (a...@live.nl<mailto:a...@live.nl>)
wrote:
Dear Freesurfer experts,
I have run several subjects through the recon-all pipeline including the
hippocampal segmentation with freesurfer 6.0 on Ubuntu 16.04. However when
looking at the text file with the volumes it seems that all the numbers are
bigger than normal as all my subjects have MCI and freesurfer reports them
having all over 5000 mm^3. I was wondering if the problem could lie somewhere
in the recon-all process?
Thank you for your time
Sincerely,
Michel Hu
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