Hi Tyler, by mapping the DTI to the anatomical space, you will automatically account for partial voluming in the DTI space. The partial volume correction in mri_segstats is for correcting within the 1mm3 anatomical voxel, which seemed excessive given the large DTI voxel sizes (but maybe it's not). It is better not to use aparc+aseg to extract surface-based measures because it is effectively just counting the number of 1mm3 voxels. The surface-based method is better because the surface has higher resolution. Why do you need stats after transformation?
doug Tyler Blazey wrote: > Hi, > > I have two questions about using mri_segstats. First, I notice that on the > individual dti tutorial, you don't use the --pvol option to correct for > partial voluming. Is there a reason for this? Second, would there be any > disadvantage to using mri_segstats with aparc+aseg.mgz to get volume/ > thickness measurements? I know from the ReconAllDevTable that the standard > method is to use mris_anatomical_stats, but I need to get the stats after > transforming the aparc+aseg image, so that is not an option. Thanks for any > help. > > - Tyler > _______________________________________________ > 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: www.nmr.mgh.harvard.edu/facility/filedrop/index.html _______________________________________________ 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.
