It depends. You don't really say how you did your Dartel
normalisation. Did you estimate warps from segmented versions of the
fMRI, or was it based on the anatomical data - under the assumption
that there are no distortions in the data?
Best regards,
-John
On 25 October 2011 13:07, Patrick Floyd <[log in to unmask]> wrote:
> Hi,
>
> I'm experimenting with using DARTEL to normalize functional data into MNI space. Typically when I run EPI->EPI normalization the resulting images appear very similarly shaped across subjects; however, the images following DARTEL norm to MNI appear much more dissimilar between subjects (and also dont fill canonical templates when analyzed). Im attaching an array of sw* images from several subjects which were analyzed following the manual - with close attention to anatomical/functional alignment prior to new segmentation - as a group to create a single set of DARTEL Templates.
>
> Is this to be expected from DARTEL normalization or might I be missing a step/setting not covered in the manual to get functional data into a more consistent space across subjects (that would hopefully also better align with/fill canonical images when analyzed statistically)?
>
> Thanks
>
> PF
>
>
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