> Date: Fri, 24 Jun 2011 12:15:50 +0000
> From: [log in to unmask]
> Subject: Re: [SPM] SPM8 preprocessinf - problem after normalization
> To: [log in to unmask]
>
> Hello,
>
> In the link below there is a wiki I created with instructions of repositioning your structural closer to the template.
>
> I hope it helps.
>
> http://imaging.mrc-cbu.cam.ac.uk/meg/RepositioningMRIs
>
> Best wishes,
>
> Elias
>
>
>
>
> --------------------------------------------------------------------------
> Elias Mouchlianitis
> Post-doctoral Research Fellow
> Psychiatric Imaging
> Imaging Cyclotron Building
> Clinical Sciences Centre Imperial College-Hammersmith Campus
> Hammersmith Hospital
> Du Cane Road, London
> W12 0NN, UK
> tel: 020 83833703
> --------------------------------------------------------------------------
>
>
>
>
>
>
>
>
> -----Original Message-----
> From: SPM (Statistical Parametric Mapping) [mailto:[log in to unmask]] On Behalf Of John Ashburner
> Sent: 24 June 2011 13:10
> To: [log in to unmask]
> Subject: Re: [SPM] SPM8 preprocessinf - problem after normalization
>
> Failures of normalisation usually arise when the initial positioning
> of the images is not good (ie more than about 3cm or 15 degrees
> mis-alignment). I'd suggest using Check Reg with your original scans
> to see how their alignment compares with the images released with SPM.
> If the alignment is poor, then the Display button can be used to
> re-position the scans.
>
> Best regards,
> -John
>
> On 24 June 2011 09:59, Laura Bled <[log in to unmask]> wrote:
> >
> >
> > Dear list
> >
> >
> > I am completely puzzled by the results of normalization in one subject. It
> > just doesn't make sense (see attached image - CheckReg function and images
> > obtained) The same slice is exposed - slice 90 for all steps - raw fMRI ,
> > after slice timing , after realign, after normalization and after smoothing.
> >
> > Volumes are completely shifted in Y and Z projections after normlization.
> >
> >
> > This happens in only one subject, nothing similar in any other subjects.
> >
> > I did try very different preprocessing steps - with inclusion and exclusion
> > of mean image from the normalization, using movement parameters as multiple
> > regressors, using artrepair toolbox and repair of bad volumes etc
> >
> > I would be grateful if I would get any help - I am completely helpless in
> > this situation and can't afford excluding this subject from my analysis.
> >
> > THANK in advance
> >
> > Laura
> >