Hi Chris

It sounds like a topological defect, but hard to say without seeing it. Can you post some images? Or follow Doug’s instructions about visualizing the defects and see if there is one in the sulcus you mention below?

Cheers Bruce

From: freesurfer-bounces@nmr.mgh.harvard.edu freesurfer-bounces@nmr.mgh.harvard.edu On Behalf Of Chris Adamson Sent: Wednesday, March 15, 2023 12:42 AM To: freesurfer@nmr.mgh.harvard.edu Subject: [Freesurfer] WM edits, prevent surface from cutting sulcus

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I have a subject where the WM surface is cutting across a sulcus despite the WM segmentation correctly labelling the GM. Is there a way of putting a “barrier” value in the wm.mgz to prevent the white matter surface from cutting across the sulcus?

Thank you.

Chris.

Dr Chris Adamson Research Officer, Developmental Imaging, Murdoch Childrens Research Institute Murdoch Childrens Research Institute Royal Children’s Hospital Flemington Road, Parkville, Victoria 3052, Australia MailScanner has detected a possible fraud attempt from "secure-web.cisco.com" claiming to be www.mcri.edu.auhttp://secure-web.cisco.com/1giMGY4fn9dwYvilfpFRhVhRx3qCzn553ez9a38OZIgqEmCDCLh6RkFbJlFJuWcGhFZT8zE-OZh8Sgsh8Y4TVrUJqIKlFE7GGpBJ_Xoq_NL_nBR61iCdzmwoum0Us5NIL60lRn_PW_49y5uqVJ2E1Xeu_DKpEFI9S87mQckprJAN9lViPvg1cobwMW3yhJmJd__d50T8SGClRSGr_yaujro7hsrCIlVxU7tvyi2rXOI4puetIedf64i4ckkkaskeW65UGAT927ygZvkQwt2_2XI0K2QvLzYwO51ROPNpd2ZTBrrfQLwYRQF7AFPzfwKkL6qEkbPdR-JhDY6Y3VNnocg/http%3A%2F%2Fwww.mcri.edu.au%2F E chris.adamson@mcri.edu.aumailto:chris.adamson@mcri.edu.au T 03 9936 6780

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