Dear Raphael,
you should be able to do this with the 'Volume of interest' module.
Create three regions of interest:
* Thresholded SPM
* Mask Image: your mask of hippocampus
* Sphere
Global maximum
SPM index: 1
Mask expression: i2
and then finally use:
Expression: i1 & i3
Best regards,
Guillaume.
On 24/11/14 02:59, Raphael F.C. wrote:
> Dear SPM experts,
>
> I am going to perform a DCM analysis in a group of images with SPM8.
>
> My goal: I have a SPM.mat file from "contrast manager" step and a mask
> of hippocampus. This mask would be used to look for the voxel inside
> hippocampus with the greatest t contrast value. Around this voxel I
> would draw a sphere of a specific radius to extract the eigenvariate
> time-series.
>
> I was searching how to do it in the internet and in SPM functions, but I
> am still lost.
>
> What I have gathered so far:
> 1) I can use: batch SPM->Util->Volume of interest, but I cannot add a
> mask here to look for the voxel with the greatest t value and then draw
> the sphere around it. Should I do this search outside the batch and then
> fill the batch with the voxel address?
> OR
> 1) I should use spm_regions.m function to create a .mat file with the
> eigenvariate time-series.
> 2) The problem is that I have to use other functions like
> spm_results_ui.m and spm_getSPM.m to create the necessary inputs for
> spm_regions.m
>
> Any ideas?
> All the best,
> Raphael
>
>
> --
> Raphael F. Casseb
> Medical Physicist, Ph.D. Student
> Medical Physics Lab - State University of Campinas
> Contact: +55 19 3521-8246
--
Guillaume Flandin, PhD
Wellcome Trust Centre for Neuroimaging
University College London
12 Queen Square
London WC1N 3BG
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