> I'm using SPM99 for PET analyses. My raw PET scans are VERY
> different from each other in terms of their translations and
> rotations. I've used the DISPLAY option in SPM to manually
> translate and rotate each image so that their origins fit in the
> AC/PC plane. I've also used the Check Reg option to verify that
> each image matches each other adequately. However, when
> realigning the images the translations are huge (20-30 mm)
> because their individual origin locations (ex. [128 128 11] and
> [140 160 8]) differ largely. I can't seem to get around this
> and I know that one should not proceed further if translations
> exceed ~5mm.
> Any suggestions?
I'd suggest that you check the results of your coregistration visually.
If they match, and if they match again after that when you open them
separately in a display window, the proper .mat file was has been
When you manually adjusted the origins of the PET-scans - did you make
sure to rewrite the header/.mat file? And was that .mat file used as
input for the coregistration process?
Alle Meije Wink
Institute for Mathematics and Computing Science, room 105
University of Groningen P.O. Box 800
9700 AV Groningen
Telephone +31 50 363 71 27 The Netherlands
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