Freesurfer

freesurfer@nmr.mgh.harvard.edu

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30064 discussions

Labels from segmentation
by Johannes Haushofer 03 Aug '06

03 Aug '06

Dear all, I'd like to create labels for certain structures based on their segmentation labels (e.g. a label containing all voxels in orbitofrontal cortex). Is there a way to automatize this? At the moment I'm using tkmedit to mark all voxels with the same segmentation label, then saving them as a label; that's a bit cumbersome... any hints? Many thanks! johannes

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DICOM conversion
by Valentin Piech 03 Aug '06

03 Aug '06

Hello everyone, I ran into the same problem converting GE multi-volume data from DICOM to nifti 4D with mri_convert as Adam Thomas in the [Freesurfer] mri_convert: dicom to nifti 4D <https://mail.nmr.mgh.harvard.edu/pipermail//freesurfer/2006-July/003324.html> thread did: I got one volume containing several thousand slices instead of the 4D volume. I also downloaded the improved version that Doug posted in the thread, and it solved my problems until recently. I have a new data set that won't convert anymore, and "mri_convert -it dicom -ot nii -dicomread2 ./mydicomfile.DCM ./myniftifile.nii" exists with the following error: *** glibc detected *** malloc(): memory corruption 0x083ba568 *** The data set is taken with the exact same protocol, except that it contains more volumes (227 instead of 176 volumes with 29 slices each). According to Doug in this thread [Freesurfer] generic dicom converting <https://mail.nmr.mgh.harvard.edu/pipermail//freesurfer/2006-July/003477.html>, there is a new version out that may solve my problem, but as it is part of the DEV version, I cannot download it as far as I know since I am not at MGH. Is there any way to download it that I don't know of? Also, I am normally using the x86_64 version, while the one posted in the previous thread is only the x86 one, so I have to have the 32 bit version of freesurfer installed and use its path when I run this version of mri_convert. Thank you very much for your help, Valentin -- Valentin Piech, Graduate Fellow Gilbert Lab for Neurobiology & Reeke Lab for Biological Modelling Rockefeller University 1230 York Ave Box 193 New York, NY 10021 PH: (212) 327-7646

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query regarding T2/T1
by Chacko Cherian 03 Aug '06

03 Aug '06

Hello all, Can we use tkmedit for T2-weighted images or is it restricted to T1 -weighted? Thanks Chacko.

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importing high-res scans
by Marie Schaer 03 Aug '06

03 Aug '06

Hi everybody, I am trying to process high res monkey scans in FreeSurfer (voxel size 0.31 x 1 x 0.31 mm). For converting them I use: mri_convert rawdata.img orig.mgz -iis 0.31 -ijs 1 -iks 0.31 -cm But I actually get a very small image in tkmedit. Further, moving each slice in any of the three directions give a volume index change of 1 and voxel RAS change of 3 (i.e. on the coronal slice number 128, the volume index 128 128 128 is equivalent to the volume RAS 0 0 0; going to the coronal slice 129 without moving the cursor will give the volume index 128 128 131, and RAS 0 1 0). Since RAS are the coordinates in millimeter, I actually expected that any change of slice would be accompanied by a 0.31 change on RAS and variation of 1 on volume index... Is there any basic step that I missed? Thank you very much, Marie Schaer

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error at autorecon2
by Chacko Cherian 02 Aug '06

02 Aug '06

Hello all, Here's an error I got while doing 'recon-all -autorecon2 -s <subject_name>. Could someone please clarify. Thank you. Chacko Cherian. #@# EM Registration Wed Aug 2 16:35:22 MST 2006 /home/ttest/freesurfer/subjects/case1/case1/case1/mri mri_em_register -mask brainmask.mgz nu.mgz /home/ttest/freesurfer/average/RB_all_2006-02-15.gca transforms/talairach.lta using MR volume brainmask.mgz to mask input volume... reading 1 input volumes... logging results to talairach.log reading '/home/ttest/freesurfer/average/RB_all_2006-02-15.gca'... setting gca type = Normal gca type average std = 7.4 using min determinant for regularization = 5.5 0 singular and 1662 ill-conditioned covariance matrices regularized reading 'nu.mgz'... Segmentation fault (core dumped) Linux ibmlnx2.samaritan.edu 2.4.20-24.9 #1 Mon Dec 1 11:35:51 EST 2003 i686 i686 i386 GNU/Linux recon-all exited with ERRORS at Wed Aug 2 16:35:41 MST 2006 __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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dicom format
by Chacko Cherian 02 Aug '06

02 Aug '06

I got this error while running a single subject in DICOM format.the 'recon-all -autorecon1 -subjid <subject_name> ' stopped at this stage. INFO: Modifying talairach volume c_(r,a,s) based on average_305 MRInormalize: could not find any valid peaks mri_normalize: normalization failed Linux ibmlnx2.samaritan.edu 2.4.20-24.9 #1 Mon Dec 1 11:35:51 EST 2003 i686 i686 i386 GNU/Linux recon-all exited with ERRORS at Wed Aug 2 14:16:22 MST 2006 __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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dicom files
by Chacko Cherian 02 Aug '06

02 Aug '06

Hello all, I have 180 slices of a subject in DICOM format.I am trying to run the 'recon-all' procedure for this subject. Are these slices seen by Freesurfer as individual acquisitions or as a single dicom file? In case they are percieved as individual acquisitions,do I need to manually type all the file names(for each slice) for the recon-all procedure or is there a simpler way. THanks in advance Chacko Cherian. Arizona State University Graduate Research Assistant __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

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mri_watershed question
by Avram Holmes 02 Aug '06

02 Aug '06

All, I am interested in using mri_watershed to remove the skull from an inplane low res structural scan (not an MPRAGE). However, when I try to I get the following message followed by the program crashing. Mode: Atlas analysis ********************************************************* The input file is P1.mgz The output file is brainmask.auto.mgz If this is incorrect, please exit with CTL-C changing type of input volume to 8 bits/voxel... MRIchangeType: Building histogram *************************WATERSHED************************** preflooding height equal to 25 percent Sorting... first estimation of the COG coord: x=127 y=133 z=24 r=80 first estimation of the main basin volume: 2160181 voxelsSegmentation fault (core dumped) I am sure that I am missing some simple flag. Does anyone know a solution to this before I run off and start using BET. Thanks, Avram

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Would adjusting watershed parameters change pial surface?
by Jake Freimer 02 Aug '06

02 Aug '06

I was wondering if setting the watershed parameters higher and rerunning autorecon2 would expand the pial surface line if the outer rim of the brain is being left out? Or would this not fix the problem? Thanks -- -Jake

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aseg.stats
by Doug Greve 01 Aug '06

01 Aug '06

I have just changed the way that DEV version recon-all creates the aseg.stats file. Previously, it would report everything that it found in FreeSurferColorLUT.txt. This included a lot of stuff that would never be in the subcortical segmentation, and this made the aseg.stats file very messy. The new version only reports on segmentations that are part of the subcortical segmentation process (ie, in mri_ca_label). Note that there may still be some segmentations reported in aseg.stats that are not found in a particular aseg.mgz because that segmentation was not found during labeling (eg, hypointensities). The values in the table (ie, volumes and intensities) should be exactly the same. This change only applies to dev (not to stable) and should be live on Tue. doug -- Douglas N. Greve, Ph.D. MGH-NMR Center greve(a)nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422 In order to help us help you, please follow the steps in: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting

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