Hi all,
Ah, good to know that there is a Talairach accuracy problem.  What have other groups been doing about this?  Do you think it makes sense to manually edit much of our data?  From what we've seen so far (registering to ages 3-9 so more errors expected) about 25% of our data have the registration sufficiently far off to push the TARGET volume (our subject's volume and the green lines in the pictures http://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/Talairach) outside of the skull.
Thanks,
-Eric

On Wed, Oct 10, 2012 at 3:26 PM, Bruce Fischl <fischl@nmr.mgh.harvard.edu> wrote:
I think 5.1 specifically has a problem with Talairach accuracy (is that right Nick?). Should be much better with the next release

On Wed, 10 Oct 2012, Eric Cunningham wrote:

Hi Bruce,
I am running version 5.10
Thanks,
-Eric

On Wed, Oct 10, 2012 at 3:13 PM, Bruce Fischl <fischl@nmr.mgh.harvard.edu>
wrote:
      Hi Eric

      what version are you running?
      Bruce
      On Wed, 10 Oct 2012, Eric Cunningham wrote:

            Greetings,

            I am trying to determine how bad a talairach.xfm
            registration has to be to
            warrant a manual edit.  I have found that even minor
            edits can have
            noticable (9%) effects on major subcortical volumes
            (such as thalamus or
            hippocampus).  Very few registrations seem to have
            completely failed, but
            most seem like they could be made better by a tweak
            here or there.  At what
            point would I just be adding randomness by manually
            editing?

            About what percent of a given dataset would you
            expect to manually edit?

            Much appreciated,
            -Eric Cunningham




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