Hi Bastian,
yes, I have some code to do what you want. You would duplicate and flip the good hemisphere in the image and then run FS on the symmetric heads. This can be done via robust_register and (mis)-using the mid space. You can find some description of this procedure here: *Robust and Accurate Contralateral Registration for Pose Normalization and Tumor Segmentation*. M.Reuter, H.D.Rosas, B.Fischl. /Human Brain Mapping 2012, Beijing http://www.humanbrainmapping.org/i4a/pages/index.cfm?pageid=3458./ http://reuter.mit.edu/blue/papers/reuter-hbm12-tumor/reuter-hbm12-tumor.pdf
and the mid-space registration is described here: *Highly Accurate Inverse Consistent Registration: A Robust Approach*. M. Reuter, H.D. Rosas, B. Fischl. /NeuroImage 53(4):1181-1196, 2010/. http://reuter.mit.edu/papers/reuter-robreg10.pdf
I currently cannot access the folder with the scripts, please send me an email directly ( mreuter@nmr.mgh.harvard.edu ) and I'll send it over as soon as I have access again.
Best, Martin
On 08/12/2014 02:56 AM, Bastian Cheng wrote:
Dear Freesurfers,
Has anyone accomplished analysis of longitudinal cortex changes in a dataset with "flipped" hemispheres?
I am currently struggling with data from stroke patients, half of them with lesions on the right, half of them on the left side of the brain.
What I am planning: flip all healthy hemispheres to left and perform longitud. analysis of cortical thickness change on that (helthy) hemisphere.
I have read the notes on Surface-based Interhemispheric Registration (xhemi) and most of the comments here. It seems to me that this would allow me to compare both hemisph. sides at ONE timepoint. (but not actually analyzing ONE (flipped) hemisphere over time).
Any help to point me in the right direction is greatly appreciated!
Bastian _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer