yes, that's all true, but the #s reported in the aseg.mgz use a partial
volume estimation to correct for border voxels using the image intensities
in the norm.mgz
cheers
Bruce
On Wed, 30 Nov
2011, Joshua Lee wrote:
Hi Bruce,
I'll see if I can phrase this right
In aseg.mgz each region has essentially been given a unique number (e.g. 17
for left hippocampus, for example). ROI taken from aseg.mgz volumes are
non-probabilistic, yes-no affairs already. MRI_binarize just pulls this out
when we want to look at particular regions, say left hipp???
Josh
On Wed, Nov 30, 2011 at 1:39 PM, Bruce Fischl <fis...@nmr.mgh.harvard.edu>
wrote:
probably not, as the aseg.stats calculation uses partial volume
estimates.
cheers
Bruce
On Wed, 30 Nov 2011, Joshua Lee wrote:
Hey Doug, THanks. That looks simpler. I'll probably use
that.
Question: Will the total volume of a ROI taken from
aseg.mgz correspond to
the volume given in aseg.stats?
Josh
On Wed, Nov 30, 2011 at 9:55 AM, Douglas N Greve
<gr...@nmr.mgh.harvard.edu>
wrote:
If you have matlab, you can load the aseg into
matlab, like
aseg = MRIread('aseg.mgz');
vol = length(aseg.vol(:,:,n:256) == ID);
where ID is the code number for the ROI you want as
found in
$FREESURFER_HOME/FreeSurferColorLUT.txt
doug
Joshua Lee wrote:
Hi All,
I would like to determine the volumes of a segmented
region
below or above an arbitrary line in one of the planes. For
example, what would be the remaining volume of a label
when z >=
nth slice, where I would have previously determined the
appropriate value of n.
Thanks,
Josh
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