Dear On,
Somebody who is more knowledgeable about SPM may be able to help you
better, but I give it a try.
I typically check image tags to ensure raw T1W and native images are in
the same space. If you right click an image in the "checkreg" function,
it pulls out the menu with bunch of nice features. When you click on
the top of the menu, it also displays information such as
Rotations
Origin
Voxel size
Image dimensions.
These number are typically all the same between segmented images and raw
T1W. Can you check if they are the same? In my experience, they are
always the same. If they are the same, it's possible that something
went wrong during segmentation. See the attached screenshot.
Hope this helps,
Hedok
On Tsang wrote:
> Hello SPMers,
>
> I have another question concerning the SPM segmentation algorithm,
> spm_preproc. This question is rather basic and quite fundamental.
> Essentially, I suspect that the algorithm does not actually retain the
> Native space in the output. Can anyone else confirm this? More specifically,
> I used the IBSR database which consists of positionally-normalized-Talairach
> datasets, and the output of spm_preproc is no longer in
> positionally-normalized-Talairach space. I am attaching a screenshot
> depicting GM segmentation for one such dataset. The image can also be found
> at the following location:
>
> http://www.utdallas.edu/~okt061000/native.png
>
> Please can anyone confirm this behavior? I would really appreciate it.
> Thanks in advance!
>
> Best Regards,
> On
>
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