sure, upload a subject and we'll take a look On Wed, 11 May 2011, Victor Yee wrote:
> Hello, > > We have some signal dropout at the top of the brain in some scans, possibly > similar to Rutvik Desai's 02/18/10 post. However, in our case, FreeSurfer is > not including any of the regions affected by the dropout in both its > subcortical segmentation and cortical parcellation. Instead, FreeSurfer > essentially begins to treat the gray/white boundary as the CSF/gray surface, > and classifies white matter as gray matter. The severity of this issue seems > to correlate with how severe the dropout is. > > I have tried running nu_correct (normalization) for up to 256 iterations. > This produces a noticeable effect when visualizing the volumes in tkmedit, > but has no effect on FreeSurfer's output. I can upload a sample subject, if > desired. We are using FreeSurfer 5.0 x64 on a Sun Grid Engine operating > servers running CentOS 4.5. > > > Thank you, > Victor Yee > _______________________________________________ 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 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.
