I doubt it's going to make that much difference, but if I had to choose, I'd choose the formula that you have below (note the the areas should be added together in the denominator).
doug Liang, Kelvin wrote: > Dear FreeSurfer Experts, > > I'd like to merge my cortical thickness measures across left and right > hemispheres. Simple averaging of the ?h.thickness values would probably be > the most straightforward method, but would it be more accurate to use a > surface-area weighted average? > > i.e. entorhinal_combined = (lh_entorhinal_thickness * lh_entorhinal_area + > rh_entorhinal_thickness * rh_entorhinal_area) / (lh_entorhinal_area * > rh_entorhinal_area) > > Alternatively, the average could be weighted by the number of vertices > (discussed in an old FreeSurfer mailing thread, but never quite concluded). > Please let me know what you think. > > Thank you, > Kelvin Liang > > The materials in this message are private and may contain Protected > Healthcare Information or other information of a sensitive nature. If you are > not the intended recipient, be advised that any unauthorized use, disclosure, > copying or the taking of any action in reliance on the contents of this > information is strictly prohibited. If you have received this email in error, > please immediately notify the sender via telephone or return mail. > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > -- Douglas N. Greve, Ph.D. MGH-NMR Center gr...@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html _______________________________________________ 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.
