Hi there,
How can I get a standard deviation map of the thickness measurements ina subject?
Inês
what exactly do you mean? Spatial standard deviations? Usually those aren't terribly interesting, and it's the cross subject ones that are more useful, but that doesn't sound like what you mean.
Bruce
On Thu, 20 Sep 2007, Inês Souta wrote:
Hi there,
How can I get a standard deviation map of the thickness measurements ina subject?
Inês
Well, I'm dealing with a patient with an heterogeneous lesion. Somehow, the lesion area seems to have misled the algorithm in terms of white and pial surface definition, leading to an erroneous cortical thickness measure in that area. What I was interested in analising (if possible) is the dispersion related to the thickness measures in that area.
2007/9/20, Bruce Fischl fischl@nmr.mgh.harvard.edu:
what exactly do you mean? Spatial standard deviations? Usually those aren't terribly interesting, and it's the cross subject ones that are more useful, but that doesn't sound like what you mean.
Bruce
On Thu, 20 Sep 2007, Inês Souta wrote:
Hi there,
How can I get a standard deviation map of the thickness measurements ina subject?
Inês
if you draw a label outlining the region you can use mris_anatomical_stats -l <label file> to get the thickness standard deviations I think. Usually they aren't that interesting because the thickness varies with geometry (e.g. sulci are thinner than gyri).
cheers, Bruce
On Thu, 20 Sep 2007, Inês Souta wrote:
Well, I'm dealing with a patient with an heterogeneous lesion. Somehow, the lesion area seems to have misled the algorithm in terms of white and pial surface definition, leading to an erroneous cortical thickness measure in that area. What I was interested in analising (if possible) is the dispersion related to the thickness measures in that area.
2007/9/20, Bruce Fischl fischl@nmr.mgh.harvard.edu:
what exactly do you mean? Spatial standard deviations? Usually those aren't terribly interesting, and it's the cross subject ones that are more useful, but that doesn't sound like what you mean.
Bruce
On Thu, 20 Sep 2007, Inês Souta wrote:
Hi there,
How can I get a standard deviation map of the thickness measurements ina subject?
Inês
ok. That's good enough for me by now. Thanks a lot
Inês
2007/9/20, Bruce Fischl fischl@nmr.mgh.harvard.edu:
if you draw a label outlining the region you can use mris_anatomical_stats -l <label file> to get the thickness standard deviations I think. Usually they aren't that interesting because the thickness varies with geometry (e.g. sulci are thinner than gyri).
cheers, Bruce
On Thu, 20 Sep 2007, Inês Souta wrote:
Well, I'm dealing with a patient with an heterogeneous lesion. Somehow,
the
lesion area seems to have misled the algorithm in terms of white and
pial
surface definition, leading to an erroneous cortical thickness measure
in
that area. What I was interested in analising (if possible) is the dispersion related to the thickness measures in that area.
2007/9/20, Bruce Fischl fischl@nmr.mgh.harvard.edu:
what exactly do you mean? Spatial standard deviations? Usually those aren't terribly interesting, and it's the cross subject ones that are more useful, but that doesn't sound like what you mean.
Bruce
On Thu, 20 Sep 2007, Inês Souta wrote:
Hi there,
How can I get a standard deviation map of the thickness measurements
ina
subject?
Inês
freesurfer@nmr.mgh.harvard.edu
-
Bruce Fischl -
Inês Souta