Re: [Freesurfer] Brain Volume measures

2011-12-02 Thread Michael Harms
Thanks Doug. And good question that I've wondered about myself Jeff. The part about the high-resolution volume that is created "under the hood" explains why mris_wm_volume takes substantially longer to complete than would be expected relative to just running `mris_volume Xh.white` and then subtr

Re: [Freesurfer] Brain Volume measures

2011-12-02 Thread Douglas N Greve
Hi Jeff, it's going to be tricker than that to get the exact value. For the WM volume computation, there's yet another routine that is used. This one creates a high-resolution volume to determine which voxels are withing the WM surface. It then loops through the voxels within the WM surface and

Re: [Freesurfer] Brain Volume measures

2011-12-01 Thread Jeff Sadino
Thank you Doug for your answer. After reading the wiki more, it has led me to another question. I am trying to duplicate the White Matter value from aseg.stats using FreeSurfer 5.0.0. The value from aseg.stats is 220804 (as it is also when running mris_wm_volume). By hand, when I run mris_volum

Re: [Freesurfer] Brain Volume measures

2011-11-30 Thread Douglas N Greve
, 2011 11:46 AM > To: Jeff Sadino > Cc: andrei.sherstyuk; skoga...@gmail.com; freesurfer@nmr.mgh.harvard.edu > Subject: Re: [Freesurfer] Brain Volume measures > > Hi Jeff, the total cortical gray matter is based on the volume between > the white and pial surfaces. The other s

Re: [Freesurfer] Brain Volume measures

2011-11-30 Thread Douglas N Greve
Hi Jeff, the total cortical gray matter is based on the volume between the white and pial surfaces. The other structures you mention below are based on the automatic volume segmentation. doug Jeff Sadino wrote: > Hello, > > Thank you Bruce and Doug for your answers to my previous question > abo