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Make sure your initial starting estimates are within about 7cm and about 20 
degrees.  There are loads of entries in the archives about how to do this.

Best regards,
-John

On Tuesday 20 December 2005 16:00, Ji Hyun Ko wrote:
> Hello,
>
>
>
> I just began to use the SPM2 for the PET analysis.
>
> It's a single subject water study. I have two conditions (two scans per
> condition) and a structural MRI.
>
>
>
> I realigned all PET files (cond1_1.mnc; cond1_2.mnc; cond2_1.mnc;
> cond2_2.mnc), so it produced a mean image and four resliced images.
>
>
>
> I think realignment was ok, but when I tried to coregister the PET files to
> structural MRI, it produced blank images.
>
>
>
> Target: MRI
>
> Source: Mean PET
>
> Others: rcond1_1.img; rcond1_2.img; rcond2_1.img; rcond2_2.img
>
>
>
> I also tried:
>
>
>
> Target: MRI
>
> Source: rcond1_1.img
>
> Others: rcond1_2.img; rcond2_1.img; rcond2_2.img
>
>
>
> And, it didn't produce the correct preprocessed images.
>
>
>
> The initial format of the files was MINC.
>
> And, I checked all the minc files, and those files didn't seem to have any
> problems.
>
>
>
> I am attaching the spm2 output file of the coregister.
>
>
>
> Thanks,
>
>
>
> Ji Hyun