Do you want to just look at a map of the differences in intensities? If so, you can register one to the other, then take the difference. If these are both freesurfer anatomicals that you have reconstructed from the same subject, then you can

bbregister --mov subject.tp2/mri/orig.mgz --s subject.tp1 --init-fsl --reg reg.tp1-to-tp2.dat --t1 --o orig.tp2-in-tp1.mgz

then

fscalc.fsl subject.tp1/mri/orig.mgz -sub orig.tp2-in-tp1.mgz orig.tp1-tp2.mgz

then

tkmedit subject.tp1 orig.mgz -overlay orig.tp1-tp2.mgz

doug

Bruce Fischl wrote:

Hi Sam,

you could either do this on a structure-by-structure basis using the aseg labels, or in Tal coords, or potentially in one of the nonlinear coordinate systems we provide (if that were needed). mri_vol2vol can be used for tal. Let us know which you prefer and we'll point you in the right direction

cheers, Bruce On Fri, 29 May 2009, Samantha Clark wrote:

...

Hi,

I was wondering if there was a way to compare t1 or t2 maps between 2 subjects using the volume brain as opposed to the surface brain.

To be specific I have two brains which are T1 maps. I want to see the differences in T1's between the two brains. How would i go about doing this.

I hope i am clear in my question.

--sam

---

Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer