Dear On,
Just to add. When I wrote, "These number are typically all the same
between segmented images and raw T1W.", I meant segmented images in
native space. This is no longer true in warped images(modulated and
unmodulated).
With regards,
Hedok
Hedok Lee wrote:
> 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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