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Hi,

As a non-expert regular user I use the Featquery GUI for this. When you get the FSL GUI by typing fsl into your terminal, you will see "Misc" on the lower left. Select Featquery from there. 

In Featquery, you can load in the feat directory with the cluster you are interested in, and then choose masks from different atlases. For example, if I have a cluster that spans the entire striatum, but I'm interested to know what the max or mean of the putamen is, I'll select the Harvard-Oxford Subcortical atlas, then run a Featquery with the Left Putamen mask and a Featquery with the Right Putamen mask. In addition to the max, you get lots of great descriptives like median and standard deviation. The results are displayed in a browser pop-up or you could write a little script to extract the values from the report.txt file in the featquery directory it produces.

Best,
Louise

On Wed, Jul 11, 2012 at 11:16 PM, zhang mingxia <[log in to unmask]> wrote:
Thanks, Mark. I saw the other peaks of other clusters. But I am not sure how FSL define the cluster in the same "cluster index". 

BTW, which demand is for ROI extraction if I want to get some area/label from AAL or other Atlas? I just found some introduction of mask drawn in FSLView. I think there should be an easy way to do it if I just want to get some common areas.

Thanks again.

Mingxia


On Wed, Jul 11, 2012 at 10:57 PM, Mark Jenkinson <[log in to unmask]> wrote:
Hi,

You should get a table of local maxima in the FEAT report underneath the main cluster table (when you click on the activation image).  The other peaks should be present there.  Alternatively, you could use the "Pre-threshold masking" option and run post-stats again in FEAT for individual ROIs.

All the best,
Mark




On 12 Jul 2012, at 06:45, zhang mingxia wrote:

Thanks, Chrisrine. But I think I should get the result from the whole brain, because I need several ROIs (I am not sure if I need to do several times with different ROI?). 

On Wed, Jul 11, 2012 at 9:37 PM, Christine Zakrzewski <[log in to unmask]> wrote:
You should be able to get the peak activated cluster in the FFA (fusiform face area), if you define it as a ROI in the image.
Christine
 

Date: Wed, 11 Jul 2012 20:27:22 -0700
From: [log in to unmask]
Subject: [FSL] How to get the peak of some area(not the whole brain).
To: [log in to unmask]


Hi Every One,

Usually, we can get the peak of every significant activated cluster in the whole brain. How can I limit it to some specific areas? For example, in some tasks, the peak in one cluster may be in inferior occipital gyrus. This cluster is wide to extend to fusiform gyrus. How can I get the peak in fusiform gyrus?

Thanks in advance.

Mingxia 






--
Louise D. Cosand
Doctoral Candidate, Clinical Neuroscience
Department of Psychology
University of Southern California