Freesurfer June 2005

freesurfer@nmr.mgh.harvard.edu

35 participants
66 discussions

morph_subject error
by Fornito, Alexander 03 Jun '05

03 Jun '05

Hi, I've come across some problems when I run morph_subject. It seems to work fine until near the end. I've included the final bit of the log below. The problem seems to occur after it calls MNI programs. I've been having trouble using the MNI tools through freesurfer, so I created the talairach.xfm separately and placed it in the transforms directory. Is this problem due to the trouble with the MNI tools? What are the MNI tools used for in morph_subject, and are they necessary at this step? Thanks again for your help, Alex registration took 1.70 hours writing registered surface to ../surf/lh.rh.sphere.reg... /data/flanders/work/alex/freesurfer/subjects/1000186_mni /data/flanders/work/alex/freesurfer/subjects/1000186_mni/scripts /data/flanders/work/alex/freesurfer/subjects/1000186_mni/scripts ------------------------------------- /data/flanders/work/alex/freesurfer/subjects/1000186_mni/scripts mris2rgb -o 1000186_mni.reg -both -c /data/flanders/work/alex/freesurfer/subjects/1000186_mni/surf/lh.sulc -canon /data/flanders/work/alex/freesurfer/subjects/1000186_mni/surf/lh.sphere.reg /data/flanders/work/alex/freesurfer/subjects/1000186_mni/surf/lh.sphere.reg /data/flanders/work/alex/freesurfer/subjects/1000186_mni/rgb ------------------------------------- using 1000186_mni.reg as output stem reading canonical coordinates from /data/flanders/work/alex/freesurfer/subjects/1000186_mni/surf/lh.sphere.reg. writing rgb file /data/flanders/work/alex/freesurfer/subjects/1000186_mni/rgb/lateral.lh.1000186_mni.reg.rgb writing rgb file /data/flanders/work/alex/freesurfer/subjects/1000186_mni/rgb/medial.lh.1000186_mni.reg.rgb morph_rgb-lh completed SUCCESSUFLLY ######################################## program versions used $Id: recon-all-nmr,v 1.37 2004/01/06 22:21:48 tosa Exp $ $Id: mri_motion_correct2,v 1.7 2004/01/16 20:25:10 tosa Exp $ mri_convert --version $ $Header: /software/source/minc/cvsroot/minc/progs/rawtominc/rawtominc.c,v 6.13 2004/02/02 18:24:58 bert Exp $ minctracc.c $Header: /software/source/registration/mni_autoreg/minctracc/Main/minctracc.c,v 96.3 2000/03/15 08:42:41 stever Exp $ $Header: /software/source/minc/cvsroot/minc/progs/mincresample/mincresample.c,v 6.12 2003/09/18 15:01:33 bert Exp $ $Header: /software/source/minc/cvsroot/minc/progs/mincaverage/mincaverage.c,v 6.4 2001/04/24 13:38:42 neelin Exp $ $Id: talairach2,v 1.5 2003/08/28 21:45:48 tosa Exp $ mri_convert --version $ # $Id: mritotal.in,v 1.10 2000/06/14 12:55:01 louis Exp $ # $Id: nu_estimate.in,v 1.15 1999/08/10 18:05:42 jgsled Exp $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ ####################################### INFO: SUBJECTS_DIR is /data/flanders/work/alex/freesurfer/subjects ERROR: cannot subject average7, needed to do average labels.

1 0

FreeSurfer and VBM data comparison
by Akemi Tomoda 02 Jun '05

02 Jun '05

Dear FS list, Here I have the FreeSurfer and the VBM data for the 26 young adults between the different parameters. I see that there is a Pearson's correlation of 0.9148 for the Left Hemisphere gmv between FS and VBM. For the right hemisphere there is a correlation of 0.9061. But when I compare the differences between the left and right hemispheres by FS and by VBM, I see that we get a negative correlation of -0.3806, p = 0.0551. And when we compare the laterality indices between the hemispheres for the 26 subjects from FS and VBM we get a correlation of -0.3464, p=0.0830. The mean (N=26) Left Hemisphere VBM data = 337820 (mm3) and for the Right Hemisphere it is 337020. With FreeSurfer we get Left Hemisphere = 363113 and for the Right Hemisphere = 368816. That is, with VBM the mean Left Hemisphere is larger than the right while with VBM the right hemisphere is the larger. The question for me is why is there a discrepancy on the differences between the hemispheres? Does this mean that FS and VBM are giving different data in spite of the strong correlations when comparing the individual hemispheres? This seems so to me. How do we account for this discrepancy in the face of the strong correlations between the FS and VBM results for the same hemisphere? Any suggestion or comments regarding this matter would be highly appreciated. Best, Akemi Developmental Biopsychiatry Research Program McLean Hospital, Belmont MA

2 1

GM segmentation
by Campbell, Zeke (NIH/NINDS) 02 Jun '05

02 Jun '05

Dear All: I would like to know which surface I should load on T1 volume to visualize cortical GM segmentation. Thanks. Zeke Campbell

2 1

Tutorial
by Michael Ryan Haynes 02 Jun '05

02 Jun '05

In FreeSurferTutorial.pdf, starting on page 27 for examples on correcting holes and handles, why do the images in the original bert file appear as right hemisphere on left while the images in the tutorial appear as right hemisphere on right side? Thanks.

1 0

skull stripping
by Fornito, Alexander 02 Jun '05

02 Jun '05

Hi all, The page about using FSL with freesurfer on the FSL website recommends using BET to skull strip the images before feeding them into freeusrfer. I've had a bit of play with this, and have noticed some marginal improvements. Would you generally recommed this practice? Are there any reasons not to? Also, what exactly does the -atlas option do? Thanks, Alex

2 1

pictures of MRI image segmentation
by Bagnato, Francesca (NIH/NINDS) 01 Jun '05

01 Jun '05

Hi: I am having troubles in preparing a picture showing MR image segmentation in the coronal, axial and sagittal planes. Any light on that? Thanks, --francesca Francesca Bagnato, MD NIB-NINDS-NIH 10 Center Drive Building 10, Room 5B16 Bethesda, MD, 20892 USA ph #: 001-301-402.6391 fax #: 001-301-402.0373 -----Original Message----- From: Bruce Fischl [mailto:fischl@nmr.mgh.harvard.edu] Sent: Tuesday, May 31, 2005 1:50 PM To: Wan Park Cc: free surfer Subject: [Freesurfer] Re: Gray Volume question Hi Wan, they haven't been normalized. Typically you would normalize by the total intracranial volume, which can be a bit tricky to get from only a T1. If you normalize by total brain volume, that should be a bit more conservative, as it would normalize out total atrophy. cheers, Bruce On Tue, 31 May 2005, Wan Park wrote: > Hi, I have a question. I am getting the gray volume for a standard area > (G_subcallosal) in different brains (male and female) with different > conditions. > > If I want to compare these volumes, should I normalize them with the total > brain (or hemisphere) volume or can I use these results directly? I > understand that the FS fills the volume from a particular brain into a > standard brain. So, are the volumes already normalized? Thanks, > > Wan > _______________________________________________ Freesurfer mailing list Freesurfer(a)nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

3 5

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

Freesurfer June 2005