Hi, Just wondering if Nick or one of the gcut developers could help me with this issue?
Regards, Sarah -----Original Message----- From: Bruce Fischl [mailto:fis...@nmr.mgh.harvard.edu] Sent: Wednesday, 13 April 2011 9:43 AM To: Sarah Whittle Cc: freesurfer@nmr.mgh.harvard.edu Subject: RE: [Freesurfer] hyperintense artifact causing problems for segmentation I'll leave that for Nick, or one of the gcut developers. cheers Bruce On Wed, 13 Apr 2011, Sarah Whittle wrote: > Thanks for your reply. I guess it could be dura. Here's a picture pre > FreeSurfer with skull on. This is a particularly bad image. No, it's > not gado enhanced. > > gcut is automatically implemented in version 5 isn't it?? Would you > suggest altering the parameters if the default doesn't help and if so, > what would you suggest? > > Regards, > > Sarah. > > -----Original Message----- > From: Bruce Fischl [mailto:fis...@nmr.mgh.harvard.edu] > Sent: Tuesday, 12 April 2011 10:24 PM > To: Sarah Whittle > Cc: freesurfer@nmr.mgh.harvard.edu > Subject: Re: [Freesurfer] hyperintense artifact causing problems for > segmentation > > wow, that is noisy. Looks like the bright ring is dura. This isn't > gado enhanced, is it? You could try using the gcut stuff > > On Tue, 12 Apr 2011, Sarah Whittle wrote: > >> Hi, >> >> >> >> I'm working with some poor quality images and having a lot of trouble >> with FreeSurfer segmentation. The main issue is that for a lot of >> images, there is a bright "strip" of hyperintense signal forming a > ring >> around the cortex. I'm not sure what this is or where it comes from. >> I've attached an example image that shows where FreeSurfer has >> misinterpreted the GM/WM border due to this artefact. It will be quite >> labour intensive to manually remove the artefact, as it appears across >> most of the cortex. >> >> >> >> Has anyone seen this before and/or could offer advice as to the best > way >> to proceed? Using the 3T flag in version 5 helps a little but far from >> perfect. >> >> >> >> Thanks, >> >> >> >> Sarah >> >> > > > 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. > > > _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
