Obtaining volume table for clusters of common regions?
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Marie
Aug 9, 2011, 3:49:01 PM8/9/11
to xjView discuss group
Hello!
I am new to using xjview and it's a great tool! I have used it to
display regions of common activation (between 3 different fMRI
contrasts from SPM5), and I was wondering whether it is possible to
obtain a volume table of "common clusters" somehow.
I tried simply clicking the "volume" button but then I can only select
a single SPM file (rather than all 3), and the coordinates from the
table are wildly off (way outside the brain; e.g. MNI (z, y, z): 80
-112 -48 ).
My understanding is that the software was updated so that all t values
(multiplication between above-threshold t values from the contributing
contrasts) have been replaced by the value "1". I assume this means
voxels cannot be compared to one another, and peak voxels from
clusters cannot be identified, is that correct? Still, is there a way
to obtain peak coordinates and cluster tables from common regions with
xjview?
Any insight would be appreciated, thanks!
Marie
I am new to using xjview and it's a great tool! I have used it to
display regions of common activation (between 3 different fMRI
contrasts from SPM5), and I was wondering whether it is possible to
obtain a volume table of "common clusters" somehow.
I tried simply clicking the "volume" button but then I can only select
a single SPM file (rather than all 3), and the coordinates from the
table are wildly off (way outside the brain; e.g. MNI (z, y, z): 80
-112 -48 ).
My understanding is that the software was updated so that all t values
(multiplication between above-threshold t values from the contributing
contrasts) have been replaced by the value "1". I assume this means
voxels cannot be compared to one another, and peak voxels from
clusters cannot be identified, is that correct? Still, is there a way
to obtain peak coordinates and cluster tables from common regions with
xjview?
Any insight would be appreciated, thanks!
Marie
Xu Cui
Aug 9, 2011, 9:59:07 PM8/9/11
to xjview-dis...@googlegroups.com
> I was wondering whether it is possible to obtain a volume table of "common clusters" somehow.
Unfortunately it is not possible.
> I assume this means voxels cannot be compared to one another, and peak voxels from clusters cannot be identified, is that correct?
Yes.
>Still, is there a way to obtain peak coordinates and cluster tables from common regions with xjview?
No.
The whole rationale is that it's impossible to define a 'peak' in the common region from multiple images. xjview used to use 'multiplication' of values from all images but it's very arbitrary.
Xu
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Xu Cui
Department of Psychiatry and Behavioral Sciences
Stanford University
Blog: http://www.alivelearn.net
Profile: http://www.peaya.com/p/?cuixu
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