Can I just add a comment on the CSF activation issue. Are you analysing
all your scans, or excluding the first few seconds worth from the analysis?
It is possible that you may need to leave out more of your early scans.
The problem may be something to do with what I believe are called T1 effects.
In the first few scans, the brain has not experienced as much magnetisation
as in the later scans, so you get a different contrast in the early images.
Things start to reach an equilibrium after the first few scans.
Regards,
-John
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