Re: [Freesurfer] Help with skull strip

2009-05-07 Thread Bruce Fischl
it is classified as GM in the aseg, or does the pial surface include it? If the former then it doesn't really matter, but if the pial grabs it you need to edit it. cheers, Bruce On Thu, 7 May 2009, Drosos, Athena wrote: Hi Sita, Thank you for your response. Our problem is that skull is b

Re: [Freesurfer] Help with skull strip

2009-05-07 Thread Drosos, Athena
Hi Sita, Thank you for your response. Our problem is that skull is being classified as grey matter, which affects our cortical thickness measures. We ended up doing manual edits to the brainmask volume for our subjects and rerunning autorecon2 with the wm flag. This has worked on some subjects

Re: [Freesurfer] Help with skull strip

2009-05-06 Thread Sita Kakunoori
Hi Athena, Small pieces of skull left is fine as long as the surfaces look okay. But if they don't or if you want to edit the skull for any other reason, you can do it manually but be careful not to edit the grey matter, which will affect the surfaces. If there is a large chunk of skull remain

[Freesurfer] Help with skull strip

2009-05-06 Thread Drosos, Athena
Hi, I am part of a group interested in measuring cortical thickness and we have had problems with skull stripping. We read on the mailing list that you are not supposed to delete the skull with the edit voxel tool on the brainmask.mgz because it affects the surfaces. What would be an appropriate w