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