The ICV will not change because that depends on the talairach transform. mri_segstats just reads in the transform that is there and computes the ICV (note that this is an *estimated* ICV, it is not derived by counting voxels). There have been several bugs with mri_segstats that are difficult to explain. Most of them have to do with making small adjustments to the various brain volume measurements (not ICV), and there was a fix to the partial volume correction too. The new version will change all of the measurements (except ICV).
doug On 08/23/2012 08:31 PM, Natalie Han wrote: > Hi, Doug and all, I wonder if the new version of mri_segstats on the ftp site > will change both the ICV and the SupraTentorial volume? Nick seems to > mention ICV will be different, the ReleaseNotes says the > SupraTentorial Volume will be changed to smaller. Can you explain more > on the difference of the new version with the original version in > FS.5.1.0? Is everything on the morphometry stats website still the > same? http://surfer.nmr.mgh.harvard.edu/fswiki/MorphometryStats. I'm > interested in several measurements, including the ICV, and the > SupraTentorial Volume and all the structures volume, just wondering if > the new version will change all the measurements. > > Thanks. > -Natalie > > On Wed, Aug 22, 2012 at 8:57 AM, Douglas N Greve > <gr...@nmr.mgh.harvard.edu> wrote: >> yes, this is a fix that will be in the next release. The new results are >> more accurate. >> doug >> >> On 08/22/2012 11:54 AM, Blazey, Tyler wrote: >>> Hi Doug, >>> >>> Thanks for the quickly reply. The new version of mri_segstats works fine. I >>> noticed after running it though that all the volumes are slightly different >>> than those reported by previous version. I think it might have something to >>> do with the partial volume correction, as the results are the same when I >>> do not use the --pv flag. Is this expected behavior? And if so, is the new >>> version more accurate? >>> >>> Thanks again, >>> >>> -Tyler >>> >>> >>> >>> ________________________________ >>> >>> The material in this message is private and may contain Protected >>> Healthcare Information (PHI). If you are not the intended recipient, be >>> advised that any unauthorized use, disclosure, copying or the taking of any >>> action in reliance on the contents of this information is strictly >>> prohibited. If you have received this email in error, please immediately >>> notify the sender via telephone or return mail. >>> >>> _______________________________________________ >>> 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. >> > -- 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
