Dear Jessica,
SPM should display a list of all images and their orientation: could you
share this with us in the hope it will gives us a hint of what your
issue is?
Best regards,
Guillaume.
On 20/05/2021 15:04, Jessica Emily wrote:
> Dear Dr. Glauche,
>
>
> thank you for the suggestion! In my pre-processing steps, I did try with
> realign -> estimate and reslice, where I got *rf images and also with
> realign & unwarp, where I got *uf images instead. Indeed, the
> interpolation is also set with b-spline for both cases. However, I still
> encountered the same error when I retrieved either *rf or *uf images,
> but it was fine with normalized (*w) images.
>
> I was under the impression that aligning the orientations are completed
> in realignment procedure and not in normalization. Maybe I have a false
> understanding here?
>
> To update a bit, I got a suggestion from my supervisor to provide the
> inverse segmented image (*iy_s) as the input in the normalization
> routine in order to warp the voxels to its own T1 image, and not to MNI
> space. Then again, the same question still holds, whether it is
> justified to normalize again to the MNI space on contrast images from
> MVPA analysis?
>
>
> Thank you again!
>
>
> Best,
>
> Jessica Emily Antono
>
>
> On Thu, May 20, 2021 at 12:57 PM Volkmar Glauche
> <[log in to unmask]
> <mailto:[log in to unmask]>> wrote:
>
> Dear Jessica,
> you don't need to run a dummy normalisation step to reslice the
> images. You may instead run Realign->Estimate&Reslice instead of
> just Realign->Estimate. In order to minimise motion induced rounding
> errors you should set the reslice interpolation option to b-spline
> instead of trilinear.
> Hope this helps,
> Volkmar
>
--
Guillaume Flandin, PhD
Wellcome Centre for Human Neuroimaging
UCL Queen Square Institute of Neurology
London WC1N 3BG
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