Sorry for the delay of my replay, Gwenaelle.
I really thank you for your answer!!!
Amelia
Amelia Versace, MD
Loeffler Building
121 Meyran Avenue, room 202
Pittsburgh, PA 15213
Phone 412- 383-8202
Fax 412-383-8336
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-----Original Message-----
From: FSL - FMRIB's Software Library [mailto:[log in to unmask]] On Behalf Of Gwenaëlle DOUAUD
Sent: Wednesday, November 28, 2007 12:36 PM
To: [log in to unmask]
Subject: [FSL] RE : [FSL] FSL_VBM selecting a mod_merg file
They indeed should look quite similar, the only
difference being the amount of Gaussian smoothing
you've performed (see the fsl_vbm manual). The way to
select the most appropriate is a combination between a
priori and a posteriori information. Basically, if
you're expecting small changes (longitudinal effect of
normal aging for instance) or in small structures
(e.g. substantia nigra), you should go for smaller
size of the smoothing kernel and vice-versa. But then,
it's really up to you to pick the one which gives you
the most interesting results (by looking at the tstat1
for each of the smoothed dataset). The smaller is the
kernel, the more refined are your results, the bigger
it is, the more confident you can be.
Hope this helps,
Gwenaelle
--- Jennifer Townsend <[log in to unmask]> a
écrit :
> I ran the fslvbm_3_proc script and received a number
> of mod_merg
> files. All of the files look more or less the
> same. How do I
> select the most appropriate smoothing?
>
> Cheers,
> Jen
>
>
........................................................................
>
> .....................................
> Jennifer Townsend
> Research Associate
> UCLA Brain Mapping Center
> 660 Charles Young Dr. South
> 310-206-4364
>
>
>
>
>
>
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