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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