btw, what tracer is this? And the asymmetry you are talking about is between the hemispheres? Is that typical for this tracer or is this a phenomena with this subject (or population)?
On 03/30/2016 03:41 PM, Adam Martersteck wrote: > Hi Freesurfer team, > > I’m encountering a problem using bbregister on PET data: > > -- When I attempt to register a PET volume to T1-space the asymmetric > tracer uptake of the PET throws off proper registration. (Treating the > PET as a T1 because of the non-specific white matter uptake > grey > matter signal). > > -- You can really see the bbregister mis-registration in this gif > here: https://goo.gl/iM6yrT > > -- It (expectedly) attempts to find the best match between signal > intensities on both the left and right surfaces, but is inherently > biased by the asymmetric uptake shifts the entire volume to the right. > > -- Are there any suggestions for dealing with asymmetric scans like > this? Stick with just a simple FLIRT? It doesn't seem to do that great > a job for everyone. > > Cutting left and right hemispheres apart and register separately? > > Using Martin’s new robust register for multi-modal data? Any > suggestions on the parameters of ROBENT? > > Thanks, > Adam > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer -- Douglas N. Greve, Ph.D. MGH-NMR Center gr...@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 www.nmr.mgh.harvard.edu/facility/filedrop/index.html Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ _______________________________________________ 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.
