The partial volume correction is done based on the intensity and label
of the surrounding voxels. By using aparc+aseg you change the label of
the surrounding structures and it changes the PV correction. Use
aseg.mgz and not aparc+aseg
doug
On 05/09/2014 05:27 AM, Schreiber, Stefanie wrote:
> D
Dear all,
For the evaluation of the subcortical volumes we executed ‘mri_segstats’ on
‘aseg.mgz’ and for comparison on ‘aparc+aseg.mgz’ in a number of individuals.
Apparently the volume of subcortical structures, like the hippocampus, is
calculated as the same values if calculated (without part
would think the volumes from freesurfer would be less than simply counting
> all voxels, but it seems to be the opposite. Any thoughts?
>
> - Original Message -
> From: Bruce Fischl
> Date: Monday, February 15, 2010 10:42 am
> Subject: Re: [Freesurfer] Subcortical Volu
:42 am
Subject: Re: [Freesurfer] Subcortical Volume Calculation
To: Hui J Yu
Cc: freesurfer@nmr.mgh.harvard.edu
> yes, we do a partial volume correction of the volumes,
> accounting for the fraction of the structure in each border voxel.
>
> cheers
> Bruce
> On Mon, 15 Feb 20
yes, we do a partial volume correction of the volumes, accounting for the
fraction of the structure in each border voxel.
cheers
Bruce
On Mon, 15 Feb 2010, Hui J
Yu wrote:
> Dear Freesurfer users,
>
> I am wondering how are the volumes calculated from stats such aseg.stat.
> When I export the
Dear Freesurfer users,
I am wondering how are the volumes calculated from stats such aseg.stat. When
I export the aseg and do a voxel count and multiple the volume per voxel, my
total volume is different from that is given by the stats. For example, the
hippocampal volume given by aseg.stats
