The xhemi analysis was set up to perform interhemispheric analysis (eg, looking at asymmetries). You can use it to do the analysis you describe though. Alternatively, you can also run
cd $SUBJECTS_DIR/yoursubject/surf mris_left_right_register lh.sphere rh.sphere lh.sphere.left_right rh.sphere.left_right
to create a direct registration. Then run mris_apply_reg, something like
mris_apply_reg --src-label lh.your.label --trg rh.your.label --streg lh.sphere.left_right rh.sphere
I think you will need a new version of mris_apply_reg. I have put one here:
ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/mris_apply_reg
On 01/14/2016 02:37 PM, Martha Shiell wrote:
Hi freesurfer list.
I have a surface label for a region-of-interest in the right hemisphere, which I generated from a cortical thickness analysis. I am now doing an analysis on the white matter below this roi, by moving the label into volume space with mri_label2vol, and sampling below the surface with the --proj option. I want to repeat this white matter analysis in the homologous region-of-interest in the left hemisphere, as accurately as possible. I found the documentation for xhemi, and an earlier post about interhemispheric registration of rois (https://mail.nmr.mgh.harvard.edu/pipermail/freesurfer/2012-July/024821.html), but I'm not clear on what the xhemi option does, nor what the outputs are, nor what fsaverage_sym is, and so I haven't been able to figure out how to use it for my purpose. Is there more info available somewhere on interhemispheric registration with freesurfer tools, and/or does anyone have suggestions for how I should proceed?
Thank you, Martha
-- Martha M. Shiell, PhD
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