Dear Carmen,
Difficult to say what is going on without more specific information.
The picture you send is the 'output' of what exactly? Are you trying
to overlay this on the MNI152 template brain at 2mm isotropic
resolution?
You clearly did not use fslspit on melodic_IC.nii.gz, the error
message says that fslsplit cannot find AC001 - are there maybe spaces
in your full path?
Also, what is the exact sequence of operation? Here is what I think
you should be doing:
(i) either (a) use separate melodic runs on the individual data sets -
when using the GUI the resulting .ica directories should contain a /
reg sub-directory containg all the necessary transformation file which
you can apply to the IC maps as described in the previous email prior
to feeding them up to a higher level analysis
OR
(b) use a single melodic GUI set up with 'time series concat' to
perform all pre-processing/registration and resampling steps
automatically. Even if you're not interested in the final concat
output the run should give you all functional runs transformed into a
common space. You can then run separate ICAs on these filterd and
transformed data sets
(ii) concatenate all the maps you want into a single 4D file.
(iii) run melodic on this - no need for any further processing or
transformations.
hth
Christian
On 20 Mar 2009, at 14:59, Carmen Ghisleni wrote:
> Dear List
>
> thanks for the answer, we tried this approach but unfortunately it
> didn't work
> out as we hoped.
>
>
> In a first attempt, we tried to use an image of a single component
> found by
> the first ICA. This image resulted from using fslsplit on the
> melodic_IC.nii.gz.
> This didn't work out at all and we got the following error:
>
> ** ERROR (nifti_image_read): failed to find header file for 'AC001'
> ** ERROR: nifti_image_open(AC001): bad header info
> Error: failed to open file AC001
> ERROR: Could not open image AC001
> Image Exception : #22 :: Failed to read volume AC001.nii.gz
> terminate called after throwing an instance of
> 'RBD_COMMON::BaseException'
>
>
> In a second attempt, we used the original, "unsplit"
> melodic_IC.nii.gz-file.
> Here we didn't get an error but the output wasn't satisfactory, I
> attached a
> picture of the result we got.
>
>
> Maybe here lies the catch: Is the melodic_IC.nii.gz-file the correct
> file to use
> and if not which file should we choose as input?
>
>
> Cheers,
> Carmen
> <Bild1.jpg>
_______________________________________________
Christian F. Beckmann, DPhil
Senior Lecturer, Clinical Neuroscience Department
Division of Neuroscience and Mental Health
Imperial College London, Hammersmith Campus
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http://www.imperial.ac.uk/medicine/people/c.beckmann/
Senior Research Fellow, FMRIB Centre
University of Oxford
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