Hi,
I don;t think there is a simple answer to this - whether or not it makes sense to concatenate different TR data or different number of volumes depends on what you want to do scientifically and what parameters you end up deriving. I struggle to find many valid reasons why one would want to do this...
*Technically* the next version of FSL will allow different length data to be fed into melodic but this will remain an undocumented beta feature for quite a while (given my doubts about the scientific value of this feature ;)
hth
Christian
On 31 Aug 2012, at 13:55, Leonardo Cerliani <[log in to unmask]> wrote:
> dearest FoSsiLs...
> I would like to perform a time-concatenated ICA with different datasets (RS-fmri) acquired with different number of time points and different TRs. My first thought was to cut all the sets to a common number of time points, but then I thought that the difference in TR could also matter. Now my insight is to cut all the datasets to a common duration (#time_points * TR), but I would really appreciate having your advice on that.
> (Maybe it doesn't matter at all and I can make my life easy...)
>
> Thank you very much in advance!
> All the best!
>
> leonardo
>
> --
>
> Leonardo Cerliani, PhD
> BCN Neuro-Imaging Center
> University Medical Center Groningen
> Antonius Deusinglaan 2 (room 131)
> tel. +31.363.8805
> 9713 AW Groningen - The Netherlands
>
> Social Brain Lab
> Netherlands Institute for Neuroscience
> Royal Netherlands Academy of Arts and Sciences
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>
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