Hi Bruce,
Thanks a lot for your reply . Is there anyway that I can get a mask for a
certain class (e.g WM) after partial volume correction using FS ? Or is it
possible for you to provide more details of it so I can reproduce the
calculation to get the mask ?
Anthony
--- On Thu, 5/3/09, Bruce Fischl <fis...@nmr.mgh.harvard.edu> wrote:
From: Bruce Fischl <fis...@nmr.mgh.harvard.edu>
Subject: Re: [Freesurfer] partial volume correction in mri_segstats
To: "Anthony" <slam_...@yahoo.com>
Cc: freesurfer@nmr.mgh.harvard.edu
Date: Thursday, 5 March, 2009, 9:33 AM
Hi Anthony,
it should be more accurate (and more reliable in our studies). It
estimates the volume fraction of each tissue class on the border of the
structure, assuming it is mixed with adjacent classes by estimating the
local mean of the two tissue classes, then computing the mixing
coefficients that explain the observed intensity. Thus for example if you
have a dark hippocampal voxel bordering ventricle it will compute that the
voxel has a fair amount of ventricle in it.
cheers,
Bruce
On Wed, 4 Mar 2009, Anthony wrote:
> Hi all,
>
>
>
> In recon-all pipeline , mri_segstats runs with -pv mri/norm.mgz
> option ,as written from
> http://surfer.nmr.mgh.harvard.edu/fswiki/mri_segstats , it is used to
> compensate partial voluming. I wonder what exactly does this do, as the
volumes given by aseg.stats are different from
> aseg.mgz and why is it more accurate ? I will appreciate if anyone could
help to clarify this .
>
> Thanks
>
>
>
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