Hi Lucy,
You shouldn't worry about the "matrix sizes".
What is important is the original, i.e. before launching any spatial
preprocessing, orientation of the image. You should check it and
possibly adjust it with the 'CheckReg' function:
- click on 'CheckReg'
- select the PET template and your image,
- check your image is overlapping the template with a "good" match (same
orientation and not too far off)
- if not, manually reorient your PET image (right-click on it - reorient
- current image - adjust parameters as needed) and apply the parameters
on the image.
Then try normalising again.
Note also that SPM PET template comes from H2O15 images, it could be a
good idea to create your own FDG-PET template at some point.
Best,
Chris
Le 4/02/2011 2:32, Lucy Elizabeth Vivash a écrit :
> Hi,
>
> I am having trouble normalising a couple of FDG-PETs. The majority of
> images (matrix size 128 x 128 x 56) have normalised fine. However there
> are a couple of images with differing matrix sizes (128 x 128 x 35, 256 x
> 256 x 224) which do not normalise (error message: "not enough overlap"). I
> have tried manually altering the matrix size to 128 x 128 x 56 to no
> avail.
>
> Any suggestions?
>
> Regards,
> Lucy
>
>
>
> Lucy Vivash MSci (Hons)
> PhD Student
> Department of Medicine
> Royal Melbourne Hospital
> 3050
> Victoria
> Australia
> Ph: (03) 8344 0531
> Email: [log in to unmask]
>
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