Dear Ramesh,
This means that the entire cluster falls within unlabelled regions in
the atlas. The information displayed at the peak level indicates that it
is within a centimetre from the left hippocampus according to the atlas.
The way to resolve this is to overlay the results on the group's average
anatomy and make your own assessment:
https://doi.org/10.1016/j.neuroimage.2006.09.055
Best regards,
Guillaume.
On 12/04/2019 07:34, Ramesh Babu wrote:
> Dear All,
>
> I did VBM analysis for 2 groups data and performed t sample t test. In
> the final result I got a cluster with peak voxel at -26 -24 -4. I
> selected dartel_aal atlas from the result window and did right click on
> the voxel co-ordinate, it shows;
> Background - 66 %,
> L Hippocampus - 21.4 %,
> L Thalamus - 9 %
> L Putamen - 3.6 %
>
> When right click on KE it shows background 100 % .
>
> What is actually background here? Can I say hippocampul changes found?
>
> Please clarify.
>
> Thanks
> RB
>
>
>
> On Thu, Apr 4, 2019 at 9:31 PM Ramesh Babu <[log in to unmask]
> <mailto:[log in to unmask]>> wrote:
>
> Dear Experts,
> Thank you for your response. I am redoing my analysis. I will
> contact you if you get any doubt.
>
> Thanks
> Ramesh
>
> On Tue, Apr 2, 2019 at 9:59 PM Flandin, Guillaume
> <[log in to unmask] <mailto:[log in to unmask]>> wrote:
>
> Dear Ramesh,
>
> If you did a right click on the x,y,z coordinates, the '%' you see
> corresponds to the intersection of a 10mm sphere centred on these
> coordinates with the atlas. If you want to label the voxels
> within the
> cluster, you have to do a right click on the cluster size
> (column k_E).
>
> Best regards,
> Guillaume.
>
>
> On 02/04/2019 12:41, Ramesh Babu wrote:
> > Dear Experts,
> >
> > I prepared a mask for the Hippocampal region and applied to
> get the
> > result. I got significant FWE corrected result. The number of
> voxel in
> > the cluster is 85. After selecting an atlas Eg, AAL atlas from the
> > result window, I right clicked on the xyz coordinate in the
> tabular
> > column. It shows Right Hippocampus 60%, background 40% and
> > parahippocampal region 2%. I am getting confuse on the
> background which
> > is 40%. Is it that out of 80 voxels 32 voxels are just
> background ( not
> > representing any region)?
> > Please give your suggestions on how to interpret the result?
> >
> > Thanks
> > RB
> >
>
> --
> Guillaume Flandin, PhD
> Wellcome Centre for Human Neuroimaging
> UCL Queen Square Institute of Neurology
> London WC1N 3BG
>
--
Guillaume Flandin, PhD
Wellcome Centre for Human Neuroimaging
UCL Queen Square Institute of Neurology
London WC1N 3BG
|