Dear Bruce, Thanks for pointing me those information. That .tif file includes the mean and variance for the population sample that was used in Freesurfer. I would like to get similar measures for our own subjects. I think I could use the surface file (like surf/?h.sulc) in each subject folder to compute the mean and variance, right? Is this file already in spherical template space? Thanks again.
Best, Liang 2012/9/14 Bruce Fischl <fis...@nmr.mgh.harvard.edu> > Hi Liang > > yes, that information is encoded in the .tif file that is the target of > the registration. You can use mrisp_paint to copy a frame out of > $FREESURFER_HOME/average/?h.**average.curvature.filled.**buckner40.tif > > the tif file is 3 sets of triplets in different frames. The first is the > mean of the measure, the second is the variance and the third is the > degrees of freedom. The 3 triplets are for the curvature of the inflated > surface, the sulc and mean curvature of the white surface. > > cheers > Bruce > > > On Thu, 13 Sep 2012, liang wang wrote: > > Dear FS folkers, >> I am working on a functional probabilistic atlas. I find that some >> functional >> regions (particular along a big sulcus) show quite high probability value >> over a >> large sample, whereas the probability for some regions are quite lower. I >> think >> this disparity could be accounted for by the anatomical variation on each >> surface >> node that appears while surface-based registering individual surface to >> the average >> template that was provided by Freesurfer. For instance, the anatomical >> variation >> could be pretty small within a big sulcus (like central sulcus). >> >> I assume that Freesurfer output a file which characterizes this type of >> anatomical >> variation. Could someone point me which file it is and how to use it to >> create a >> group-level measure in order to clear display somewhere has large >> variation. >> Thanks. >> >> Best, >> Liang >> >> -- >> Liang Wang, PhD >> Neuroscience of Attention and Perception Laboratory >> Princeton Neuroscience Institute >> Princeton University >> Princeton, NJ, 08540 >> >> >> >> >> > > 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<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. > -- Liang Wang, PhD Neuroscience of Attention and Perception Laboratory Princeton Neuroscience Institute Princeton University Princeton, NJ, 08540
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