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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