Hi Jeff,
why do you say that one is bad? We don't resample, so neither one will be
aligned with the atlas unless you apply the transform.
We are aware that the eTIV measures have more variability than we would
like, and we're looking into it, but don't have a good solution from only
T1 images.
cheers,
Bruce
On Thu, 4 Sep 2008,
Jeff Sadino wrote:
Hello all,
According to aseg.stats, our ICV values fluctuate on the same subject across
scans, sometimes by up to 10% I have been validating the
talairach_with_skull.lta accuracy by comparing the nu_neck.mgz to the
RB_all_withskull_2006-02-15.gca template. I read on the boards that it is not
all that necessary that the brains match, that it is more important for the
skulls to match. The RB is blurred (I don't fully understand where the RB
comes from, I think from 22 subjects that the freesurfers combined into one?),
so am I matching up the whitest areas of the RB to the skull on the nu_neck
image? I noticed also that the bottom of the brains rarely match at all to the
RB image...is this normal? Are there any other parts of the image that need to
be checked for validity?
I attached two nu_noneck.mgz files, one was good and the other bad. Are these
images typical?
Thank you for your help,
Jeff
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