Freesurfer May 2008

freesurfer@nmr.mgh.harvard.edu

63 participants
95 discussions

mri_volcluster --ERROR: you must specify a pos or neg sign with --fwhm
by PKUNWAR＠nmr.mgh.harvard.edu 26 Aug '09

26 Aug '09

Hi all, I was going through the FSFAST TUTORIAL from wiki( https://surfer.nmr.mgh.harvard.edu/fswiki/FsFastTutorial?action=highlight&v…) I got the follwoing error during mri_volcluster, "NOT Adjusting threshold for 1-tailed test ERROR: you must specify a pos or neg sign with --fwhm" I have fwhm.dat file with 4. something vlaue. Command used, [galen:odd-v-0] (nmr-std-env) mri_volcluster --in tal.rfx.osgm/osgm/sig.nii --thmin 2 --fwhmdat tal.rfx.osgm/fwhm.dat --cwpvalthresh 0.1 --mask tal.rfx.osgm/mask.nii --fsaverage --sum tal.rfx.osgm/osgm/cluster.sum --cwsig tal.rfx.osgm/osgm/cwsig.cluster.nii --out tal.rfx.osgm/osgm/sig.cluster.nii --ocn tal.rfx.osgm/osgm/ocn.cluster.nii without --fwhmdat flag, it gave me another error "ERROR: need csd with --cwsig" will appreciate for help thanks pratap ----------------------------------- FREESURFER_HOME: /usr/local/freesurfer/stable4 Build stamp: freesurfer-Linux-centos4_x86_64-stable-v4.0.1-20070927 RedHat release: CentOS release 4.4 (Final) Kernel info: Linux 2.6.9-42.0.3.ELsmp x86_64 NMR Center info (/space/freesurfer exists): machine: galen SUBJECTS_DIR: /autofs/space/galen_003/users/carl/Tutorial/buckner_data/FsFastTutorialData/FSFTUTDIR/subjects PWD: /space/galen/3/users/carl/Tutorial/buckner_data/FsFastTutorialData/FSFTUTDIR/fb1-preproc-study/group-analysis-tut/sm-gamma-fwhm5/odd-v-0

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design matrix : inter-run effetcs
by Andersson Frederic 02 Dec '08

02 Dec '08

Hi, Computing individual fMRI analysis (several runs) and looking at the design matrix (X.mat), I saw that only one regressor represents each condition. I was expecting that the number of regressors concerning a condition would be the number of runs (as SPM). There are "inter-run effect" regressors but is this better if I affect a different value for each of run and each condition (see examples below). Other question concerning design matrix : only 3 movement parameters included in the design matrix. Why 3 rather than the 6 computed during movement correction? Concerning inter-run effects and movement parameters, is there any advantage of reducing the number of regressors but having a less ideal model? >>> 1 condition = 1regressor 0 = rest 1=conditionA 2=conditionB Pardagim files : RUN#1 RUN#2 RUN#3 0 0 0 0 0 0 3 0 3 0 3 0 6 0 6 0 6 0 9 0 9 0 9 0 12 0 12 0 12 0 15 1 15 1 15 1 18 1 18 1 18 1 21 1 21 1 21 1 24 1 24 1 24 1 27 1 27 1 27 1 30 0 30 0 30 0 33 0 33 0 33 0 36 0 36 0 36 0 39 0 39 0 39 0 42 2 42 2 42 2 45 2 45 2 45 2 48 2 48 2 48 2 51 2 51 2 51 2 54 2 54 2 54 2 57 0 57 0 57 0 >>> 1 condition = 1regressor / run 0=rest 1=conditionA run#1 2=conditionB run#1 3=conditionA run#2 4=conditionB run#2 5=conditionA run#3 6=conditionB run#3 Pardagim files : RUN#1 RUN#2 RUN#3 0 0 0 0 0 0 3 0 3 0 3 0 6 0 6 0 6 0 9 0 9 0 9 0 12 0 12 0 12 0 15 1 15 3 15 5 18 1 18 3 18 5 21 1 21 3 21 5 24 1 24 3 24 5 27 1 27 3 27 5 30 0 30 0 30 0 33 0 33 0 33 0 36 0 36 0 36 0 39 0 39 0 39 0 42 2 42 4 42 6 45 2 45 4 45 6 48 2 48 4 48 6 51 2 51 4 51 6 54 2 54 4 54 6 57 0 57 0 57 0 Frédéric ANDERSSON.

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Checking for spikes
by Brittany Cassidy 06 Aug '08

06 Aug '08

Hello all, I was looking for a general way to check for spiking from Freesurfer or the FSFast stream. Any ideas are appreciated. Thanks! -Brittany

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IO with freesurfer files (.mgh in particular) from Python
by Yaroslav Halchenko 21 Jul '08

21 Jul '08

Does anyone know any handy module to at least read in .mgh files from Python? Or should I simply try mri_convert them into .minc and use netcdf module within python? Thanks in advance for the ideas! -- Yaroslav Halchenko Research Assistant, Psychology Department, Rutgers-Newark Student Ph.D. @ CS Dept. NJIT Office: (973) 353-5440x263 | FWD: 82823 | Fax: (973) 353-1171 101 Warren Str, Smith Hall, Rm 4-105, Newark NJ 07102 WWW: http://www.linkedin.com/in/yarik

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documentation of the Freesurfer output and directory structure?
by Turner, Jessica 02 Jul '08

02 Jul '08

Hi experts-I have to document for some non-Freesurfer users what is in all the Freesurfer 3.05 subdirectories from an analysis. We have come up with a lot of it from the Wiki pages and tutorials, but there are some things that still aren't clear (what exactly is the bem directory for? What exactly is the mri_nu_correct.mni.log file? Etc.). Is it laid out clearly somewhere? I've seen the pages about which files are created by what process, etc. and it seems like it should say somewhere what these directories and files really are, I'm just missing it. Thanks, Jess ------------------------ Jessica Turner, Ph.D. Project Manager, FBIRN (www.nbirn.net) Department of Psychiatry and Human Behavior University of California, Irvine Phone: (949) 824-3331 Fax: (949) 824-3324

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atlas renormalization
by Juranek, Jenifer 26 Jun '08

26 Jun '08

Another curious question: The atlas renormalization process described by Han & Fischl (2007)...which version of freesurfer was this introduced? Many Thanks, Jenifer

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cortical measures - normalised?
by Narly A Golestani 21 Jun '08

21 Jun '08

Dear all, Am I correct in thinking that the measures of cortical volume, area, and thickness, as well as subcortical volumes obtained after running the reconall pipeline (and found in the 'aparc' and 'aseg' files, respectively) are native ones? Or are they based on normalised brains, thus 'controlling' for overall brain volume differences? thanks, Narly.

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White Matter Regional Volumes
by hranilovich＠ucla.edu 10 Jun '08

10 Jun '08

My name is Jennifer as well, and I work in the same lab as Jennifer Bramen, who originally wrote to you, below. I am writing while she's out of town to follow up on your reply below. Mainly, I am a little confused by your suggestion to use asegstats2table command, because the resultant text file when this command is run on the wmparc.mgz file is not openable in excel - it has too many columns/is too large. Unfortunately, the --maxsegno flag is not helpful because the white matter volumes are the second half of the segmentations listed in the wmparc.mgz file. Thus, the --maxsegno command will only yield an output file that has none or some of the white matter volumes, rather than only the white matter volumes. Any suggestions? Thanks- Jennifer Hranilovich Quoting Jenni Pacheco <jpacheco(a)mail.utexas.edu>: Hi Jen, In Doug's absence, let me try and give you the best answer I can! The wmparc.mgz uses the cortical parcellation and grows each label down through the white matter - giving a label of the white matter underneath each cortical unit. Because of this there will be both cortical (ctx) and white matter (wm) measures in the wmparc.stats - the ctx regions being taken directly from the cortical parcellation, and the wm regions resulting from growing those inward. Depending on what version you are using, you can use asegstats2table to tabulate these results, as you would the subcortical segmentation. Check the help on this file, there may be an option to do it directly, or you may have to use a flag to specify a new stats table (i.e., wmparc.stats instead of aseg.stats). Hope this is helpful, Jenni On Wed, Apr 30, 2008 at 8:17 AM, Jenni Pacheco <jenni.pacheco(a)gmail.com> wrote: Hi Jen, In Doug's absence, let me try and give you the best answer I can! The wmparc.mgz uses the cortical parcellation and grows each label down through the white matter - giving a label of the white matter underneath each cortical unit. Because of this there will be both cortical (ctx) and white matter (wm) measures in the wmparc.stats - the ctx regions being taken directly from the cortical parcellation, and the wm regions resulting from growing those inward. Depending on what version you are using, you can use asegstats2table to tabulate these results, as you would the subcortical segmentation. Check the help on this file, there may be an option to do it directly, or you may have to use a flag to specify a new stats table (i.e., wmparc.stats instead of aseg.stats). Hope this is helpful, Jenni On Wed, Apr 30, 2008 at 7:04 AM, Bruce Fischl < fischl(a)nmr.mgh.harvard.edu> wrote: Hi Jen, Doug is out of town at the fBIRN meeting, and he's the one that will answer this so you might have to wait a bit. cheers, Bruce On Tue, 29 Apr 2008, Jennifer Bramen wrote: I posted the below question regarding white matter volumes to the list last Friday. I think it fell through the cracks because I sent it out in the late afternoon, and was hoping someone could help me understand 1) the outputs of indicvidual wmparc.stats files and 2) how to tabulate these data like we can with gray matter volumes. Thanks again. Jen Hi Freesurfer Users, This may be a newbie question. I am trying to evaluate regional volumes. I have been able to tabulate the gray matter volumes, but cannot figure out how to tabulate all the white matter volumes. I see that in individual folders, there is a file called wmparc.stats. Do any of the tools query this file, or will I need to pull the data manually? Inside this file, I see some of the regions listed as wm-?h-<regionname>. Next to these are sometimes a lot of zeros and sometimes a bunch of values. I am wondering why so many of these do not have values associated with them. I am also wondering why only some of the regions listed in this file are labeled wm, when the file suggests it contains white matter stats... If there is somewhere on the site that explains white matter volumetric analyses, could someone please send me the link? Thank you Jennifer Bramen

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sub-voxel projections
by Ben Kennedy 09 Jun '08

09 Jun '08

Dear Freesurfer, I've been playing around with Freesurfer and monkey MR volumes, and I'm trying to find some sort of foothold to use Freesurfer more effectively. I have the surfaces and inflated volumes of the brain, and I also have a bunch of sub-voxel coordinates (in the T1 volume) of recorded sites that I want to project onto these surfaces and inflations. Is there any straightforward (but I'll take convoluted also) way to do this? Thanks, Ben K

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Whole brain GM volume
by deepa preeti 31 May '08

31 May '08

If I need whole brain Gray matter (GM) volume, can I add just left GM and Right GM volumes after runing mris_anatomical_stats on ?h.cortex.label (in the label directory). I appreciate your suggestions. Thanks, Deepa Ramasamy.

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Freesurfer May 2008