Dear Zoe,
On Mon, 2 Jul 2012 16:20:20 +0000, Hyde, Zoe <[log in to unmask]> wrote:
>Dear SPMers,
> I have a question for you about the VBM8 analysis I am currently running. I used DARTEL to create a custom template from my 89 child participants. I am now going to use this custom template in the VBM8 step of 'Estimate and Write' (as I understand from the VBM8 manual that this is the recommended method when using VBM8 with a large scale paediatric sample). The DARTEL Template creation step has outputted 7 custom templates (0-6) of increasing accuracy, and Template 6 is the most accurate as it was created last and looks the crispest. However the default DARTEL template that VBM8 uses for spatial normalisation is Template 1. This is what is on line 66 of the 'cg_vbm_defaults' script in the vbm8 toolbox: vbm8.extopts.darteltpm = {fullfile(spm('dir'),'toolbox','vbm8',' Template_1_IXI550_MNI152.nii')}; % Indicate first Dartel template. Why isn't the most accurate Template 6 used as the default template? Although Template 1 is the first template VBM8 uses, does the function then progressively go through all the templates (1-6) which have the same filename in an iterative manner?
Your last assumption is correct. All templates from iteration 1-6 are used, but only the first template is defined in the defaults file. I have used the naming convention of the DARTEL toolbox.
Best,
Christian
________________________________________
Christian Gaser, Ph.D.
Departments of Psychiatry and Neurology
Friedrich-Schiller-University of Jena
Jahnstrasse 3, D-07743 Jena, Germany
Tel: ++49-3641-934752 Fax: ++49-3641-934755
e-mail: [log in to unmask]
http://dbm.neuro.uni-jena.de
>Thanks a lot for your help!
>
>Zoe Hyde
>Research Assistant
>
>Developmental Risk and Resilience Unit
>Clinical, Educational and Health Psychology
>Division of Psychology and Language Sciences
>
>University College London
>26 Bedford Way
>London WC1H 0AP
>
>[log in to unmask]<mailto:[log in to unmask]>
>Tel: +44(0)20 7679 5322<tel:%2B44%280%2920%207679%205322> (internal: 25322)
>http://www.drru-research.org/
>
>
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