Hi Mojdeh it won't affect any individual thickness measures, *but* will affect the estimated total intracranial volume (eTIV). We don't typically use eTIV for thickness correction, but do for things like hippocampal volume. Are you using version 5.1? If so, that's the problem. Nick has a fix for this that he can direct you about, or you can wait for 5.2 and rerun the Talairach registration then.
cheers Bruce On Fri, 20 Jul 2012, Mojdeh Zamyadi wrote: > Hi all, > > Sorry for re-posting this but it seems it didn't get through! > > I've just started to do cortical thickness analysis on some subjects and > I'm noticing some miss-registrations, more specifically the Talairach > image is smaller than the target image no matter what subject I look at! > I just wanted to make sure if this is something normal and to what > extend it's going to effect the individual cortical thickness > calculations. I guess I'm not sure how the Talairach transformation is > used in further steps of the cortical thickness calculation. > > I tried to attach example coronal, sagittal and horizontal slices of one > of my subjects but apparently it was too big for the mailing list. Pleas > let me know if there is a way to attach images here. > > I greatly appreciate your advice. > > Thanks, > Mojdeh Zamyadi, MSc > Clinical Research Project Assistant > The Hospital for Sick Children > 555 University Avenue > Toronto, ON, M5G 1X8 > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > _______________________________________________ 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.
