Higher than 1mm resolution helps a lot.  We use 0.7mm isotropic in the HCP.

Peace,

Matt.

From: "Megha K." <megha.ka@gmail.com>
Date: Monday, December 9, 2013 10:23 PM
To: <freesurfer@nmr.mgh.harvard.edu>
Subject: [Freesurfer] Occipital cortex segmentation

Dear Sir/Madam,

I am using freesurfer for 3T MRI analysis of visual cortical thickness in elderly patients with ophthalmic disease. We are having a bit of trouble with the accuracy of cortical segmentation in the visual cortex (namely the pericalcarine region) as the cortex is quite thin in our patients (compared to controls). You can see in the attached image that whilst there is smooth cortical segmentation in the peri-calcarine region, the cortex is not visible to the naked eye.  If you have any ideas on improving accuracy, I would be very grateful.

Thanks
Megha
_______________________________________________ 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.