I'd take a look at spm_summarise. It's the simplest program to extract all
the data. You will get 33 values for each voxel in the mask. Then you can
decide if you want the mean or eigenvariate from there. The values will be
the amount of gray matter or the density of gray matter depending on the
input images.
Best Regards, Donald McLaren
=================
D.G. McLaren, Ph.D.
Research Fellow, Department of Neurology, Massachusetts General Hospital and
Harvard Medical School
Postdoctoral Research Fellow, GRECC, Bedford VA
Website: http://www.martinos.org/~mclaren
Office: (773) 406-2464
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On Sat, Sep 6, 2014 at 10:09 AM, Sarah Boukezzi <[log in to unmask]>
wrote:
> Dear SPM list,
>
> I am working on longitudinal data using VBM8 toolbox. I have three time
> points for each of my 11 subjects .
>
> I want to extract the amygdala volume by using ROIs, and I am using the
> first Eigenvariate but I am not sure to be right by using this following
> method:
>
> - I choose my contrast
> - ROI analysis from saved mask
> - p value adjustment to control -> none -> threshold {T or p value } -> 1
> - egeinvariate
> - VOI definition -> cluster
>
> I read in other comments that in the graphics window, I see the extracted
> time series from the selected cluster. But what does it exactly mean?
>
> In my command window, I obtain 33 values (3 values for each of my 11
> subjects)
>
> But what are these values? Is it a number of voxels or other thing? units??
>
> Am I right by using this methology in order to extract the amygdala volume?
>
> If I am not right how can I do ?
>
> Thanks & regards,
>
> Sarah.
>
