Hi Marcos, the hippocampal subfield volumes are single values for each subject and hemisphere, so you cannot display them on the brain surface. Cheers, /Eugenio
On Thu, May 16, 2013 6:22 pm, Marcos Martins da Silva wrote: > > Hi, Doug > Thank you for your answer. > Well I guess that after I read your both tutorials for group analysis > (http://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/GroupAnalysis and > http://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/QdecGroupAnalysis ) > I mistook the concepts of qdec.table.dat and FSGD. My fault. > > Following the QDEC tutorial I saw we could import aseg data to > qdec.table.dat after pressing "generate stats data tables" button. So I > was wondering if I could do the same from hippo-subfields data. > Importing is faster and more precise than make the table by hand. > > Well the hippo-subfield pipeline creates several files such as > posterior_left_subiculum.mgz on for each subfield and side. As far as I > know you can: > 1- run kvlQuantifyPosteriorProbabilityImages to output the volume in > voxels > 2- visualize the subfield segmentations with freeview loading nu.mgz and > the posterior* files as p-labels. > > Following QDEC tutorial we could generate a display showing the > correlation between cortical thickness (or volume) and age for example. > I would like to a similar analysis with hippo-subfields and get a > display showing the correlations of the hippo-subfields and age. So, > just for an example, perhaps I could notice that subiculum volume > decreases with age but hippocampal fissure increases with age. > > I guess I could analyze the data from hippo-subfields in a statistical > package to get numbers and graphics but it would be great if I could see > that as a surface like we do with cortical data. > Cheers, > Marcos > Em Qui, 2013-05-16 Ã s 11:56 -0400, Douglas N Greve escreveu: > >> Hi Marcos, >> >> >> On 05/15/2013 08:32 PM, Marcos Martins da Silva wrote: >> > Hi, freesurfers >> > I have two questions: >> > 1- Is there a way to use QDEC to analyze data from hippocampal >> > subfields created by recon-all -s subj -hippo-subfields? That is, I >> > know I can manually put data from posterior* files when making the >> > FSGD file but it would be great if I could import it like I do from >> > aseg.stats. >> when you say you want analyze the hippo subfields in QDEC, do you mean >> you want to include them as regressors?If so, you will need to add them >> to your QDEC table. BTW, QDEC does not needan FSGD file. >> > >> > 2- Assuming all data from my subjects are already are already in the >> > FSGD, I understand I can select cortical thickness or volume as >> > dependent variable and inspect the correlations between cortical >> > thickness and age, for example. But I could not find how to define a >> > hippocampal subfield volume as a dependent variable. Is that possible? >> > This way I could display correlations between a subfield volume and >> > age or gender. >> I have not used the hippo subfields yet, and I'm embarrassed to say that >> I don't know what exactly it outputs. If there is a stats file there, >> you can run asegstats2table to create a table file, then use the table >> as input to mri_glmfit (use the --table option). >> doug >> > >> > Thank you, >> > Marcos >> > >> > >> > _______________________________________________ >> > Freesurfer mailing list >> > Freesurfer@nmr.mgh.harvard.edu >> > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >> > > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer ------------------------------------------------------------------------------------- Juan Eugenio Iglesias, PhD http://www.jeiglesias.com igles...@nmr.mgh.harvard.edu Athinoula A. Martinos Center for Biomedical Imaging 149 Thirteenth Street, Suite 2301 Charlestown, Massachusetts 2129 U.S.A. _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
