Hello SPMers,
I have the following question: what is the optimum way to define VOI for
each subject?
Explanation:
I am looking at the amygdala and hippocampus. After making t-contrast, I
choose small volume , masked with amygdala defined from WFU-pickatlas,
and look for p-values. Then I choose one of supratreshold voxels, and
try to make VOI around it, by clicking on 'eigenvariate', then mask, and
I choose again the same mask. This gives me some VOI, however the size
varries from subject to subject. It ranges from 25 - 230 voxels (the
latter exceeds the amygdala size anyhow).
For my DCM analysis I want to compare the effective connectivity among
groups. But I am not sure what is the best way to define these VOI's. If
I try to make sphere, by choosing the supratreshold, I don't get always
the same center of the sphere.
Any suggestions?
Thanks in advance
Regards
Brani
--
Branislava Curcic-Blake, PhD
Cognitive Neuropsychiatry group
BCN Neuroimaging Center (NIC)
University Medical Center Groningen
Antonius Deusinglaan 2
9713 AW Groningen
Tel: +31503638806
Fax: +31503638875
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