Thanks Bruce, this is going to be very helpful.
One thing I have not understood from the statistics freesurfer outputs is why average thickness is not exactly the ratio between volume and surface area. This is just a small curiosity though.
Best regards.
Dorian
Hi Dorian
yes, that would work.
cheers
Bruce
On Wed, 23 Jul 2014,
Dorian P. wrote:
> Hi all,
> A while ago I asked how can I calculate the average thickness of the three
> lateral temporal gyri, and Bruce kindly suggested to draw the label on
> fsaverage and use transforms to calculate it for each subject. I may try to
> do that, but given my time constrains and my level of knowledge of
> Freesurger I thought an alternative method:
>
> Say for example I have the inferior, middle, and superior temporal gyrus
> with surface areas of 1000, 2000, and 3000. They also have an average
> thickness of 2, 3, and 4mm, respectively. Given that these thicknesses are
> distributed in those areas, I could weight each region accordingly and
> calculate the average thickness as:
>
> ( (1000*2) + (2000*3) + (3000*4) ) / (1000+2000+3000) = 20000/6000 = 3.33
>
> Is this logic correct, and why yes or no?
>
>
> Thank you in advance.
> Dorian
> TJU
>
>
_______________________________________________
Freesurfer mailing list
Freesurfer@nmr.mgh.harvard.edu
https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
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 . 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.