Hi Rujing,
If portions of gray matter have been removed, then that will need to be
corrected. You can definitely remove skull/dura manually from the
brainmask.mgz volume (see link below), but that can be time-consuming and
may not be necessary. It's hard to know for sure if a brainmask.mgz is
bad until you have generated the surfaces or have some experience with
similar cases processed with Freesurfer.
https://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/SkullStripFix_freeview
-Louis
On Tue, 3 Dec 2013, Rujing Zha wrote:
> Dear Louis,
> Thanks for your helpful prompt in advance.
> I see. In my case, there is a not properly stripping, there is a not
> properly gray matter(there are a some skull considered as gray matter). Did
> you mean I can draw the segmentation without considering the skull
> stripping? And a bad brainmask.mgz will not influence the GM thickness
> analysis?
> Thanks in advance.
> All the best.
>
> 2013-12-03
>
> ____________________________________________________________________________
> Rujing Zha
>
> ____________________________________________________________________________
> 发件人:Louis Nicholas Vinke <vinke@nmr.mgh.harvard.edu>
> 发送时间:2013-12-03 03:58
> 主题:Re: [Freesurfer] recon-all strip skull and neck by brain volume mask
> 收件人:"Rujing Zha"<charujing123@163.com>
> 抄送:"freesurfer"<freesurfer@nmr.mgh.harvard.edu>
>
> Hi Rujing,
> Even if there is some skull/dura left after the skullstrip step in
> recon-all, it still may not negatively impact the surfaces. It might be
> worth running the remaining recon-all steps to see how the surfaces turn
> out.
>
> If you want to swap-in a better skullstripped volume into the recon-all
> stream then you just need to replace the brainmask.mgz and continue with
> autorecon2 and autorecon3.
>
> Keep in mind that the new brainmask.mgz volume still needs to be in the
> conformed anatomical space, so use the T1.mgz or brainmask.mgz to create
> the improved skullstrip volume which will replace the existing
> brainmask.mgz.
>
> -Louis
>
> On Mon, 2 Dec 2013, Rujing Zha wrote:
>
> > Dear all,
> > Part of subjects 3d images cannot be stripped skull and neck properly in
?? ?> recon-all default. I have got the brain volume mask, how I can using the
?? ?> existing proper mask to help strip skull in recon-all and next workflow?
?? ?> Thanks.Any reply will be appreciated.
> > All the best.
> >
> > 2013-12-02
> >
> > _________________________________________________________________________
> ___
> > Rujing Zha
> >
> >
> _______________________________________________
> 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 i
> s
> addressed. If you believe this e-mail was sent to you in error and the e-ma
> il
> contains patient information, please contact the Partners Compliance HelpLi
> ne at
> http://www.partners.org/complianceline . If the e-mail was sent to you in e
> rror
> but does not contain patient information, please contact the sender and pro
> perly
> dispose of the e-mail.
>
>
>