Hello mailbase (John, Andrew etc.),
We've made a series of studies with slight modifications.
Our final results show a contrast but IN the brain, NOT on the
cortex. Otherwise the placement semed to be OK.
After discussion we resulted in 2 possibilities.
1. I made the realign, norm and smooth with SPM99 (version from may)
and the final statistics with SPM96 as before (I found out that the
old method of contrasts etc didn't work with 99b).
Could the templates differ so that scaling went wrong.
2. We took also arterial blood samples for input and quantitated
the data as flow images. We used as input for SPM this flow data,
not the original uptake image data.
This shoul not matter, but is it more sensitive for errors if the
input data in some studies was not perfect.
Best regards Mika
--
Mika Teras, Hospital physicist tel Int+358 2 2611830
Turku PET Centre FAX Int+358 2 2318191
Turku University Central Hospital email: [log in to unmask]
PO BOX 52, 20521 Turku, Finland http://www.utu.fi/med/pet/
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