Hi Maria
to get the overall average you would need to weight each area by how big it is. Probably easier to use mris_anatomical_stats -l lh.cortex.label
cheers Bruce
cheers Bruce
On Thu, 17 Dec 2015, Maria Kharitonova wrote:
Hi, in response to the average thickness measure (see below). In ?h.aparc.stats, I see a variable ThickAvg, is that it? And then to get the average thickness across the *entire* cortex, I average across the couple of dozen regions that it provides?
Thanks! Maria
Message: 7 Date: Fri, 11 Dec 2015 13:49:23 -0500 From: Douglas N Greve greve@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] average cortical thickness measure? To: freesurfer@nmr.mgh.harvard.edu Message-ID: 566B1AB3.9090309@nmr.mgh.harvard.edu Content-Type: text/plain; charset=windows-1252; format=flowed
In ?h.aparc.stats, you'll find a line like
# Measure Cortex, MeanThickness, Mean Thickness, 2.40617, mm
You'll have to get the value for each hemi and compute the mean
On 12/11/2015 01:38 PM, Maria Kharitonova wrote:
I know that the aseg atlas provides a number of voume measures (e.g. EstimatedTotalIntraCranialVol, TotalGrayVol), but is there a variable for an average cortical thickness? I?d like to see if thickness in some of the regions is associated with a variable of interest over and above an overall main effect, so would like to control for the average thickness, but can?t figure out a good way to do that.
Thanks! Maria
? Maria Kharitonova, PhD Research Assistant Professor Department of Medical Social Sciences Northwestern University Feinberg School of Medicine 625 N. Michigan Ave, Suite 2700 Chicago, IL 60611 Phone: (312) 503-6503 Email: maria.kharitonova@northwestern.edu mailto:maria.kharitonova@northwestern.edu
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