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Subject:

Re: vbm and volume

From:

Juergen Haenggi <[log in to unmask]>

Reply-To:

Juergen Haenggi <[log in to unmask]>

Date:

Wed, 24 Sep 2008 12:57:55 +0200

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (47 lines)

Hi Marcus

Actually, it is the probability that a particular voxel belongs to GM or WM.
If you take the integral over all voxel values (spatial resolution of voxels
1x1x1mm) within a cluster, you will get mm3 or micro-liter as the unit of
the cluster. 

Regards
Jürgen


On 24.9.2008 12:19 Uhr, "Markus Burgmer" <[log in to unmask]>
wrote:

> hi.
> 
> there has a question in a vbm analysis with christian gasers vbm5.1 approach
> arise by a reviewer. i can't find an answer in the list about this topic.
> maybe somebody can help?
> 
> we performed a test of volumetric differences between two groups of subjects
> with helpf of vbm5.1 (modulated images). for each 'significant' cluster we
> liked to depict the amount of 'real' differences between the groups in box
> plots with help of marsbar. what is the unit of the values extracted? we
> thought this would be 'ml'.
> 
> thanks a lot 
> 
> markus


-----------------------------------------------------------
Juergen Haenggi
Ph.D. (Dr. des.)
Division of Neuropsychology
Institute of Psychology
University of Zurich
Binzmuehlestrasse 14, PO Box 25
8050 Zurich, Switzerland
0041 44 635 73 97 (phone office)
0041 76 445 86 84 (phone mobile)
0041 44 635 74 09 (fax office)
BIN 4.D.04 (office room number)
[log in to unmask] (email)
http://www.psychologie.uzh.ch/neuropsy/ (website)
http://www.juergenhaenggi.ch (private website)
-----------------------------------------------------------

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