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 greve@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

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