I understand how to segment CSF and write out the segmented images. I cannot find a way within SPM99 to use the segment ed image to mask the functional data for an individual subject.
Please describe the steps necessary to use a mask in SPM99 for fMRI data for an individual subject analysis.
Jerry Allison
Medical College of Georgia
>>> Michiru Makuuchi <[log in to unmask]> - 5/30/01 10:16 PM >>>
Dear SPM authors and users;
I would like to know whether there is pitfall in my idea.
My idea is masking or removing white matter, CSF, or any part
that is not expected to show BOLD signal change from EPI data
before statistical computation. This will reduce the number of statistical
comparisons
and confer more sensitivity. The masked or removed data may be
used to calculate "a global mean" that do not reflect coritical activity
induced by
experimental tasks and seem more appropriate as an index of a base line
drift of the signal.
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Michiru MAKUUCHI $B!! (BPh.D
assistant professor
Cognitive Neuroscience, Fac. of Med.
Univ. of Tokyo
7-3-1 Hongo, Bunkyo-ku, Tokyo.
03-5841-3571
[log in to unmask]
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