Freesurfer

freesurfer@nmr.mgh.harvard.edu

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30076 discussions

ERROR: cannot find ... /surf/rh.volume
by rafael＠huberworld.ch 24 Aug '07

24 Aug '07

Dear Freesurfer Users Always when i try to do the mri_preproc command with the option "meas volume" i get a error message. (ERROR: cannot find ... /surf/rh.volume). I only get this error message with "volume". All other measures like area, thickness and so on work correctly. Does somebody has a clue how i can solve this problem?

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design matrix Q ?
by Kirk, Gregory 22 Aug '07

22 Aug '07

Hi refering to http://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/DesignMatrix Design Matrices with DOSS and DODS I want to make an analysis of same offset different slope between classes with a continuous age variable If I was doing this with the example( 3 variables ) starting with for dods 1 0 10 0 100 0 1000 0 1 0 15 0 150 0 1500 0 0 1 0 20 0 200 0 2000 0 1 0 25 0 250 0 2500 I would change to for same offset different slope 1 10 0 100 0 1000 0 1 15 0 150 0 1500 0 1 0 20 0 200 0 2000 1 0 25 0 250 0 2500 for my example with 2 classes and one variable, age I would have.. for same offset different slope a contrast vector [ 0 1 -1] in file sodsage.mat --direct comparison between thickness and age between class and do glm_fit with my design in file Xgsods.dat matrix of the form, 4 subj for brevity 1 n1 0 1 n2 0 1 0 n3 1 0 n4 mri_glmfit --y lh.sickle.thickness.10.mgh --glmdir lh.sickle_sodsage.glmdir --surf SICKLECELLAVE lh --C sodsage.mat --X Xgsods.dat did I get it correct ? thanks Greg.

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Re: [Freesurfer] tksurfer: "window type not found"
by Stefan Vollmar 22 Aug '07

22 Aug '07

Dear Bruce, dear Kevin, we have upgraded to Freesurfer 4.0.0. Now "doublebufferflag" does make a difference: if we set it to "1" and execute tksurfer bert lh pial we see a tiny sliver of the brain on the right hand side when running Freesurfer remotely on a Linux x86 system (Fedora Core 7, SunFire X2200). This seems to be independent of the X-Server we use (the same effect was observed using MacOSX, Linux32 and Solaris10). Without setting "doublebufferflag" tksurfer's window is not updated. Is there something else we could try? Many thanks in advance, Stefan Am 20.08.2007 um 15:17 schrieb Bruce Fischl: > sorry, I'll maybe Kevin can help > > Bruce > On Mon, 20 Aug 2007, Stefan Vollmar wrote: > >> Dear Bruce, >> >> Am 20.08.2007 um 03:33 schrieb Bruce Fischl: >> >>> try this: >>> setenv doublebufferflag 1 >>> tksurfer ... >> >> On the SunFire T2000 server (Solaris 10) I get: >> >> [...] >> Loading /daten/share/opt/freesurfer/freesurfer/surface_labels.txt >> surfer: ### redraw failed: no gl window open >> surfer: single buffered window >> Window type not found! >> surfer: failed, trying double buffered window... >> [...] >> >> resulting in a blank graphic's window. >> >> We tried >> doublebufferflat=0 >> and >> doublebufferflat=1 >> but did not see any difference - and this is odd. >> >> Using "env" after the tksurfer call we made sure that indeed this >> variable was correctly set. I assume, there should be a difference? >> >> Many thanks in advance, >> Stefan >> -- Dr. Stefan Vollmar, Dipl.-Phys. Max-Planck-Institut für neurologische Forschung Gleuelerstr. 50, 50931 Köln, Germany Tel.: +49-221-4726-213 FAX +49-221-4726-298 Tel.: +49-221-478-5713 Mobile: 0173-5340707 Email: vollmar(a)nf.mpg.de http://www.nf.mpg.de

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mri_watershed problem
by Cameron Ellis 21 Aug '07

21 Aug '07

Hi everyone, I am trying to output bem surfaces using mri_watershed and I receive badly distorted surfaces. During the autorecon process there did not appear to be any errors generated, and the final surfaces look good, it is just in producing the bem surfaces independent from autorecon that errors arise. I am trying to get any information as to why these surfaces would come out distorted and potential correction strategies. Any advice is much appreciated! Cameron

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talairach
by Akram Bakkour 21 Aug '07

21 Aug '07

Hi, Is the talairach read differently in std and in dev? When I check the talairach on a single subject using tkmedit $s brain.mgz -main-transform talairach.xfm it looks different if I'm in dev vs std. so for example: setenv $SUBJECTS_DIR /space/banzai/3/users/efenster/OFRR_processing source /usr/local/freesurfer/nmr-std-env tkmedit OFRR78 brain.mgz -main-transform talairach.xfm it looks right vs source /usr/local/freesurfer/nmr-dev-env tkmedit OFRR78 brain.mgz -main-transform talairach.xfm which looks different. Is the dev today what is going to become std (stable4) tomorrow? Thanks! Akram. -- Akram Bakkour Gerontology Research Unit 149 13th Street, Suite 2691 Charlestown, MA 02129 tel: 617-726-5571 fax: 617-726-5760 web: http://www.dickersonlab.org

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surface DTI group contrast
by Robert Levy 20 Aug '07

20 Aug '07

Hello, I have been attempting to run a between group DTI contrast using glmfit, and it could not determine how to produce the data that is given to mri_glmfit as its input. My approach below may be wrong, so if you can recommend a better way of doing it please advise. Assuming this method is a valid approach, here is my technical problem: the resampling step shown below seems to work, but glmfit reports that there is an incorrect number of rows, so I guess something goes wrong. The first thing I do is resample from volume to surface onto average7 for each of the subjects: cat Subject_Lists/bw-group-error-dti-5 | while read sub ; do mri_vol2surf \ --src "$sub"/dti/unwarp/maps/sreg/fa.bhdr \ --srcreg "$sub"/bold/register.dat \ --trgsubject average7 \ --out DTI_HCvASD_mriglfmit/surface/"$sub"_fa.mgh \ --hemi lh done And then I create a final output to give to mri_glmfit: mri_concat DTI_HCvASD_mriglfmit/surface/mano*_fa.mgh --o DTI_HCvASD_mriglfmit/all_fa.mgh The process I'm attempting above is similar to what mris_preproc uses surf2surf to do, but I think I need to use vol2surf instead of surf2surf. As far as I can tell mris_preproc would not work, because in what I am doing I need to go from the volume to the surface. This vol2surf method "works" in that it doesn't have any errors when running (though some warnings about registration file being different from source file), and it generates the resampled surface that I concatenate at the end. So far so good but when I run mri_glmfit, I get an error message (see below). mri_glmfit \ --really-use-average7 \ --y DTI_HCvASD_mriglfmit/all_fa.mgh \ --fsgd fsgd_and_contrast_files/BwGroupErrorDTI5.fsgd \ --glmdir DTI_HCvASD_mriglfmit/HCvASD.fsfast.glmdir \ --C fsgd_and_contrast_files/BwGroupErrorDTI5.mat sysname Linux hostname vantz machine x86_64 user levy FixVertexAreaFlag = 1 UseMaskWithSmoothing 1 OneSampleGroupMean 0 y /autofs/space/ventzl_015/users/DTI_HCvASD_mriglfmit/all_fa.mgh logyflag 0 usedti 0 FSGD fsgd_and_contrast_files/BwGroupErrorDTI5.fsgd glmdir DTI_HCvASD_mriglfmit/HCvASD.fsfast.glmdir DoFFx 0 Creating output directory DTI_HCvASD_mriglfmit/HCvASD.fsfast.glmdir Loading y from /autofs/space/ventzl_015/users/DTI_HCvASD_mriglfmit/all_fa.mgh Matrix condition is 1 Pruning voxels by frame. Found 155495 voxels in mask Saving mask to DTI_HCvASD_mriglfmit/HCvASD.fsfast.glmdir/mask.mgh search space = 155495 *ERROR: dimension mismatch between y and X. y has 23 inputs, X has 24 rows. * My .fsgd file matches the exact set of subjects that went into the aggregate .mgh file, so that isn't the reason. What do you think might be the cause of this error? Thanks, Rob Also, here is some information on the environment I ran these commands in: -------- freesurfer-Linux-centos4_x86_64-dev-20070819 -------- Setting up environment for FreeSurfer/FS-FAST (and FSL) FREESURFER_HOME /usr/local/freesurfer/dev FSFAST_HOME /usr/local/freesurfer/dev/fsfast FSF_OUTPUT_FORMAT nii SUBJECTS_DIR /space/ventzl/1/users/SUBJECTS_DIR MNI_DIR /usr/local/freesurfer/dev/mni FSL_DIR /usr/local/freesurfer/dev/fsl [vantz:SUBJECTS_DIR] (nmr-dev-env) pwd /space/ventzl/1/users/SUBJECTS_DIR -- Robert P. Levy, B.A. Research Assistant, Manoach Lab Massachusetts General Hospital Charlestown Navy Yard 149 13th St., Room 2611 Charlestown, MA 02129 email: levy(a)nmr.mgh.harvard.edu phone: 617-726-1908 fax: 617-726-4078 http://nmr.mgh.harvard.edu/manoachlab

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Validation for surfaces
by Goldman, Aaron (NIH/NIMH) [C] 20 Aug '07

20 Aug '07

Hi, regarding validation of freesurfer's surface reconstructions, I was just wondering which papers you would most recommend citing. Thanks, -Aaron-

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Re: [Freesurfer] Re: Freesurfer Digest, Vol 41, Issue 13-add gray matter
by Wang, Xin 20 Aug '07

20 Aug '07

Thank great helps from the group. I have a related issue. In my images some gray matters at the top of medial wall is lass than 60, so that these small areas are not included in gray matter. This may be due to the shadow of RF coil. Can I fix it by either decrease the threshold of gray matter or manually include these small areas? Thank you again, Xin Bruce Fischl Mon, 09 Jul 2007 15:08:20 -0700 usually it's because the bias field brings the gm too low, so if you find nearby white matter (that is *not* partial volumed) that is below 110, putting some control points there will also move the pial surface out a bit. Or the skull strip could have removed it. Or the topology fixer might have done something strange. This can be checked by looking at the ?h.orig.nofix surface and seeing if it is more accurate than the ?h.orig. If this is the case you'll need to identify and correct the topological defect in the wm.mgz volume. cheers, Bruce On Mon, 9 Jul 2007, Sebastian Moeller wrote: Hi, not being an expert, please take my rambling with a grain of salt. But I am somewhat curious to learn better ways ;) On Jul 9, 2007, at 11:03 PM, [EMAIL PROTECTED] wrote: Message: 9 Date: Mon, 9 Jul 2007 17:01:42 -0400 From: "Wang, Xin" <[EMAIL PROTECTED]> Subject: [Freesurfer] add the gray matter To: "freesurfer" <freesurfer(a)nmr.mgh.harvard.edu> Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; charset="iso-8859-1" Hello, Group I need to edit the pial surface. I learned to remove points with tkmedit from the tutorial. But how to add gray matter in the pial surface? 1) If you have nothing where gray matter should be, then check brainmask.mgz, if this is missing gray matter, around where your problems occur edit the bainmask.mgz volume and pick up your reconstruction from there. (IIRC there is something in the tutorial about this) 2) If there is white matter where gray matter should be, be sure to to check nu.mgz and brainmask.mgz at the critical parts for too high intensity in the supposed gray matter. Either control points might helo (unlikely) or redoing the intensity correction (and then starting again from that point). At least for my data, acquired with surface coils, sub-optimal intensity correction is really annoying. ahoi & good luck Sebastian Thank you in advance. Xin

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tksurfer: "window type not found"
by Stefan Vollmar 19 Aug '07

19 Aug '07

Hi, we are running the current version of freesurfer on a number of SunFire X2200 servers (Fedora Core 7). Everything works fine when we run tksurfer remotely from some Linux and MacOS X boxes on the X2200 servers. However, when using a SunFire T2000 server (Solaris 10) as a front end, we experience the following problem when trying to run tksurfer on the X2200 systems: "window type not found" and tksurfer's graphics window remains blank. Solaris 10 on that machine uses the Xorg server with Mesa, so, in theory, GLX extensions should not be the problem here (tkmedit, infact, does work). This is an important issue for us, as we could use freesurfer on our SunRay thin clients if we get it to work on the T2000 (I am aware that, in an ideal world, we would want to run all of freesurfer on some local system using hardware acceleration, however, our server/ thin client-setup - although not ideal for freesurfer - does make a lot of sense for other applications). Many thanks in advance, Stefan -- Dr. Stefan Vollmar, Dipl.-Phys. Max-Planck-Institut für neurologische Forschung Gleuelerstr. 50, 50931 Köln, Germany Tel.: +49-221-4726-213 FAX +49-221-4726-298 Tel.: +49-221-478-5713 Mobile: 0173-5340707 Email: vollmar(a)nf.mpg.de http://www.nf.mpg.de

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qdec for old ?
by Kirk, Gregory 17 Aug '07

17 Aug '07

Hi , I would imaging we would need to be running the most recent freesurfer version to use qdec We just finished a study with V3.0 and are doing the analysis. Mainly interested to see if we could do some analysis with subcortical structures. thanks Greg.

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Freesurfer