Antonio,

If you have built your own average subject, then to use in qdec, you will have to do the following:

1) run 'recon-all -s <subj> -qcache -target myaveragesubj'

where 'myaveragesubj is the name you gave to your average subject. by default, the -qcache command resamples the subject data onto the fsaverage surface, which is what qdec uses, so the extra -target option has it use a different averague subject

2) in qdec, change the 'Common-space subject' box, in the Subjects tab, to the name of your average subject.

Also, make sure that your average subject is in the same SUBJECTS_DIR as your other subjects. This can be set in the environment, or in the SUBJECTS_DIR text box in qdec.

Nick

Dear Freesurfers

I am trying to build an average subject (dataset with 38 subjects) under FS v4.0.5 (freesurfer-Linux-rh9-stable-pub-v4.0.5-full.tar.gz). It seems to work fine. But, when I click the Analyze button of Qdec, the error show as below:

Writing to /usr/local/freesurfer/subjects/qdec/Untitled/contrasts.sig.mgh reading group avg surface area 828 cm^2 from file Reading in average area /usr/local/freesurfer/subjects/fsaverage/surf/rh.white.avg.area.mgh reading group avg surface area 990 cm^2 from file Reading in average area /usr/local/freesurfer/subjects/fsaverage/surf/rh.pial.avg.area.mgh reading group avg surface area 828 cm^2 from file Couldn't find file /usr/local/freesurfer/subjects/fsaverage/surf/rh.curv

I don't know how to deal with this problem. Could you tell me how to resolve this?

Thanks in advance.

Antonio

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Antonio Cerasa PhD Part-time lecturer: University of Calabria UNICAL & University "Magna Graecia" UNICZ. Laboratory of Neuroimaging Institute of Neurological Sciences National Research Council (CNR) C/Da Burga 44, 87050 Cosenza, Italy. Phone: +39 0984.9801270 Fax: +39 0984.969306 Phone mob: +39 333/9633511 http://www.isn.cnr.it/public/pagine_ita/settori_neuroimg.asp________________... Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer