Freesurfer

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30132 discussions

mri_volcluster in single direction
by G. William Chapman IV 28 Jun '11

28 Jun '11

Hello All, I've been using fslstats to create a mask of voxels reaching a certain threshold and then using mri_volcluster to reduce the mask down to just clusters above 3 voxels. Now we're trying to filter them down to just those clusters that have more than 3 contiguous voxels in a single direction, rather than total volume. I can't find anything in the help file on this, but I was wondering if there's possibly an undocumented flag in mri_volcluster that would do this? Thanks! ----- G. William Chapman IV ENG BME 2012 wchapman(a)bu.edu (617) 383-9042

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Error using tkmedit
by Antonella Kis 28 Jun '11

28 Jun '11

Hello, I have some problems with tkmedit. The recon-all finished without problems, but when using tkmedit the following error occured: /usr/local/freesurfer//tktools/tkmedit.bin: error while loading shared libraries: libXmu.so.6: cannot open shared object file: No such file or directory Thanks for helping. Antonella ________________________________ ________________________________ This e-mail may contain confidential, personal and/or health information(information which may be subject to legal restrictions on use, retention and/or disclosure) for the sole use of the intended recipient. Any review or distribution by anyone other than the person for whom it was originally intended is strictly prohibited. If you have received this e-mail in error, please contact the sender and delete all copies.

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Tkmedit error
by Antonella Kis 28 Jun '11

28 Jun '11

------------------------------ Dr.Antonella Kis, PhD Clinical Research Project Coordinator The Hospital for Sick Children (SickKids) Diagnostic Imaging Department Neurosciences and Mental Health Sessional Lecturer Life Sciences, Physics Department University of Toronto at Scarborough Hello, I have some problems with tkmedit. The recon-all finished without problems, but when using tkmedit the following error occured: /usr/local/freesurfer//tktools/tkmedit.bin: error while loading shared libraries: libXmu.so.6: cannot open shared object file: No such file or directory Thanks for helping. Antonella ________________________________ ________________________________ This e-mail may contain confidential, personal and/or health information(information which may be subject to legal restrictions on use, retention and/or disclosure) for the sole use of the intended recipient. Any review or distribution by anyone other than the person for whom it was originally intended is strictly prohibited. If you have received this e-mail in error, please contact the sender and delete all copies.

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sourcing freesurfer
by Kat Mott 28 Jun '11

28 Jun '11

I just installed freesurfer on Mac OSX and everything went smoothly in installation. But now I am trying to source it, and it's not working. I typed 'csh' into the terminal to launch c-shell, and then entered: [115-18-41-155-wireles1x:/Applications/freesurfer] Kat% setenv FREESURFER_HOME </Applications>/freesurfer [115-18-41-155-wireles1x:/Applications/freesurfer] Kat% source $FREESURFER_HOME/SetUpFreeSurfer.csh And it returns: /SetUpFreeSurfer.csh: No such file or directory. I can see that the SetUpFreeSurfer.csh file is in the freesurfer folder, so I'm really not sure what is causing this error. I've tried doing this from different directories, too. Thanks for any help.

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lGI value is aberrantly high
by Wayne Su 28 Jun '11

28 Jun '11

Hello, I am using FS 5.1 to measure lGI (local Gyrification Index). Only one particular scan failed. Here are some messages: ³... remeasuring lGI value for vertex iV = 65101. It may take a few minutes. WARNING -- Problem for vertex iV = 65101, lGI value is aberrantly high (lGI=56.5472)... ...lGI computation will be stopped. This may be caused by topological defects, check mris_euler_number on the pial surface.² ³mris_euler_number ../surf/lh.orig \n euler # = v-e+f = 2g-2: 143555 - 430659 + 287106 = 2 --> 0 holes F =2V-4: 287106 = 287110-4 (0) 2E=3F: 861318 = 861318 (0) total defect index = 0² ³mris_euler_number ./lh.pial-outer-smoothed ================= euler # = v-e+f = 2g-2: 65560 - 196674 + 131116 = 2 --> 0 holes F =2V-4: 131116 = 131120-4 (0) 2E=3F: 393348 = 393348 (0) total defect index = 0² I re-run the recon-all -s 01_097_Y0 -hemi lh -autorecon2 autorecon3 and recon-all -s 01_097_Y0 -localGI It stopped at the same vertex. Could you please let me know anything I can do to overcome this issue? Thank you very much. Wayne

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surface reconstruction of neonatal brain
by Antonis Makropoulos 28 Jun '11

28 Jun '11

Hello everybody, I would like to ask you about the topology correction algorithm of freesurfer. I have produced the tissue segmentation for a number of neonatal brains, but as they are not topologically accurate, I would like to try your algorithm to fix the surfaces. As I can see, the mris_fix_topology step requires the brain.mgz volume, but I am not sure how to produce it. I have read the paper "A METHODOLOGY FOR ANALYZING CURVATURE IN THE DEVELOPING BRAIN FROM PRETERM TO ADULT" where the different tissues are substituted by uniform intensities recognised by freesurfer, but I would like to use the original image information if possible. Is there any way to make use of the T1/T2 images (transform them) in the mris_fix_topology step? Thank you very much for your time. With kind regards, Antonis

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rtview and color bar
by Michelle Umali 28 Jun '11

28 Jun '11

Hi Freesurfers! I ran rtview, and I couldn't find a color bar/legend. I'm just wondering how thow the colors get assigned. Is each color a position of wedge stimulus? I'm trying to define V1/V2/V3 boundaries and was wondering how to get the horizontal and vertical meridians. Any help would be most welcome. Thanks. Michelle

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FNIRT and fslregister
by marco battaglini 28 Jun '11

28 Jun '11

Hi all, regarding the VolumeRoiCorticalThickness pipeline, is it possible to apply non linear transformation as obtained by FNIRT, instead of linear transformation as obtained by FLIRT? If yes, in which way? By using fslregister? Thank you marco

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recommended voxel size
by Jessica Liu 27 Jun '11

27 Jun '11

Hi all, I know that freesurfer recommends an isotropic voxel size, but I found that a voxel size of 1.2x1.2x1.6 at 1.5T actually gives a better resolution for my data. Would the different voxel size significantly affect the outcome of the volumetric segmentation? Thanks! Jessica

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Problems with Tkmedit
by Antonella Kis 27 Jun '11

27 Jun '11

Hi, I have some problems with tkmedit. The recon-all finished without problems, but when using tkmedit the following error occured: /usr/local/freesurfer//tktools/tkmedit.bin: error while loading shared libraries: libXmu.so.6: cannot open shared object file: No such file or directory I was running: tkmedit NPI002 brainmask.mgz \-aux T1.mgz -surfs \-segmentation aseg.mgz $FREESURFER_HOME/FreeSurferColorLUT.txt Please help. Thank you. Antonella

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