There was no picture attached. There was a zip with 3 jpgs, but I could
only display one of them.
doug
Alex Fornito wrote:
>
> Hi all,
> Sorry if this is a re-post, but I’m not sure if the first one got through.
>
> I’m really stuck on a problem I was hoping to get help with.
>
> I’m having trouble determining the correspondence between ROIs in a
> surface-based annotation and those in a volume-based annotation
> generated using mri_aparc2aseg. I have some custom-generated surface
> annotations and have been using a recently updated binary of
> mri_aparc2aseg which adds 10,000 to the values of left hemi annotation
> labels and 20.000 to the right hemi labels in the converted volume, to
> help distinguish the two hemisphere’s rois.
>
> To check the correspondence between the surface and volume, I chose an
> roi 10386 from the volume. To check it
> on the surface I did the following in matlab:
>
> [v,l,ct]=read_anntotation('lh.fsavg_500_compact.aparc.annot');
> new=zeros(size(v));
> new(find(l==ct.table(386,5)))=1; % note the roi index should be 10,000
> less that of the volume.
> F=write_wfile('386.w',new,v);
>
> I did this for both the fsaverage surface and a single subject
> surface, and
> compared it with the volume representation for the same single
> subject. The
> attached pic called vol386 shows the roi in blue, overlaid on the volume
> parcellation in greyscale. It is located in the left inferior temporal
> lobe.
>
> The attached surf386 pic however, indicates this region is in the
> retrosplenial cortex for both the single subject (left) and fsaverage
> (right).
> Am I missing something here? Have I misunderstood the correspondence
> between surface and volume rois?
>
> Thanks for your help,
> Alex
>
> ------------------------------------------
>
> Alex Fornito
> CJ Martin Post-Doctoral Fellow
> Brain Mapping Unit
> Department of Psychiatry
> University of Cambridge
> Downing Site
> Downing St, Cambridge
> UK CB2 3EB
>
> Email: [email protected]
> Phone: +44 (0) 1223 764670
> Fax: +44 (0) 1223 336581
>
> /Australian Details:
> /
> Melbourne Neuropsychiatry Centre
> National Neuroscience Facility
> Levels 1 & 2, Alan Gilbert Building
> 161 Barry St
> Carlton South 3053
> Victoria, Australia
>
> Email: [email protected]
> Phone: +61 3 8344 1861
> Fax: +61 3 9348 0469
>
> ------------------------------------------------------------------------
>
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--
Douglas N. Greve, Ph.D.
MGH-NMR Center
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