Freesurfer February 2017

freesurfer@nmr.mgh.harvard.edu

162 participants
277 discussions

A note about the Freesurfer license file
by Z K 14 Dec '17

14 Dec '17

Hello All, Users on newer linux distributions who upgrade from Freesurfer version 5.3 to version 6.0 may get the following error message: -------------------------------------------------------------------------- GNU libc version: 2.17 ERROR: Systems running GNU glibc version greater than 2.15 require a newly formatted license file (it's free). Please download a new one from the following page: http://surfer.nmr.mgh.harvard.edu/registration.html -------------------------------------------------------------------------- This is a known issue, and as the message says, it is resolved by downloading a newly formatted license file from our registration page: http://surfer.nmr.mgh.harvard.edu/registration.html Simply overwrite the old license file with the newly formatted one. Sorry for any inconvenience this may have caused. -The Freesurfer team

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mri_cvs_register: how to read/import .m3z warp file
by Stefano Zappalà 06 Nov '17

06 Nov '17

Dear FreeSurfer Developers, I am trying to visualize and modify the output warp field (in .m3z) of a mri_cv_registration call aimed at aligning a T1w scan to the MNI space. I was wondering how file format .m3z is organized, in order to read it with, for example, matlab. Or if there are simpler file format to convert the warp field to. No information about it seems to be reported in the website. Moreover, I've searched the list and a similar question was not answered. I was wondering if you have some suggestions in reading the output warp field of mri_cvs_register. 1) FreeSurfer version: freesurfer-Linux-centos6_x86_64-stable-pub-v6.0.0-2beb96c 2) Platform: ubuntu 16.04 LTS Many thanks, Stefano.

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Version 6.0 - ?h.white.preaparc vs. ?h.white for determining the need to edit brainmask.mgz, wm.mgz, add control points, etc.
by Mira Michelle Raman 04 Sep '17

04 Sep '17

Hi, My main question to the 6.0 experts is: Is the lh.white.preaparc close enough to the lh.white to determine whether editing is needed (brainmask.mgz, wm.mgz,control points) or do we need to run the full pipeline and get ?h.white? Here's the reasoning behind this question. In previous versions of Freesurfer we have run -autorecon1 -autorecon2, then checked surfaces, made edits if needed, and then only after we were satisfied with the surfaces we ran -autorecon3. Primarily we have done this for 2 reason, first is to save processing time, on both the initial pass and running -autorecon2-cp or -autorecon2-wm. We also use this as a quality control method, in which ONLY subjects whose surfaces have been verified, have been through -autorecon3, those that haven't, don't have stats files, and thus can't get inadvertently included with finished data. If ?h.white.preaparc doesn't topologically differ from the ?h.white could we use it for determining what edits to do? if it does differ obviously we will have to run the whole pipeline. Thank you in advance for your guidance. Sincerely, Mira _______________________________________________ Mira Michelle Raman Lead Scientific Programmer The Center for Interdisciplinary Brain Sciences Research Stanford University 401 Quarry Rd, Ste. 1356

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Re: [Freesurfer] [Announcement] Freesurfer v6.0 beta release and testing
by Elijah Mak 03 Aug '17

03 Aug '17

Hi ZK, Thanks. It is great news! I would like to report the following. asegstats2table seems to be acting strangely. File "/Applications/freesurfer_b6/bin/asegstats2table", line 195 print 'ERROR: subjects are not specified (use --subjects SUBJECTS)' Even typing asegstats2table --help leads to the same error message. It was not found in a prev dev built or in 5.3. Thanks. Also, not sure if it's placebo, but freeview seems to be running quicker now. Best Wishes, Elijah

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output with input matrix size and referential
by pierre deman 02 Aug '17

02 Aug '17

Hello, I am trying to have the atlases aparc.a2009+aseg.mgz, hippocampal subfield etc ... in a matrix with the same size as the input of recon-all (and not the cubic matrix 256x256x256) and with the same orientation. what is the best way to do it ? Cheers, Pierre -- DEMAN Pierre Mobile : +33 7 82 57 80 94

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RBV PVC: Saving output file before upsampling
by SudEEpti 18 Jul '17

18 Jul '17

Hello, Is there a way to save the PVC (RBV) output in native PET resolution, before upsampling? Would you also be able to share the command that is used for upsampling? I would like to play with a different type of interpolation. Thank you very much. Su

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bbregister vs spmregister vs mri_coreg
by John Anderson 06 Jul '17

06 Jul '17

Dear Freesurfer experts, I see that the tool "mri_coreg" has been implemented recently in Free Surfer 6 and I really wanted to know what are the differences between the registration tools "bbregister", " spmregister" and "mri_coreg"! Kindly: 1. Are these tools similar? if not what are the differences ? 2. Is there any preference of using a tool over the others for specific type of data. For example: A. If I want to register FA map to T1 image which tool is more robust? B. if I want to register FA map to MNI space which tool is more robust? I highly appreciate your input on this! John

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Raw Cortical thickness values
by Muhammad Naveed Iqbal Qureshi 06 Jul '17

06 Jul '17

Dear Community, I need to know how can I read the numeric cortical thickness values from freesurfer processed files. (as there are too many in the surf folder) Thank you. Best Regards Naveed

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Average myelination within ROI
by SHAHIN NASR 06 Jul '17

06 Jul '17

Hi Surfers, I want to measure the average amount of myelinations within my ROI(s), I have already generated my myelination maps on surfaces (e.g. lh.myelin_ProjFrac0p5.nii ). Then I used mri_segstats as below: mri_segstats --i lh.myelin_ProjFrac0p5.nii --slabel SBJ_001 lh lh.V1 --sum V1_Stats.txt --accumulate but the numbers don't make any sense. For instance: # ColHeaders Index SegId NVertices Area_mm2 StructName Mean StdDev Min Max Range 1 0 125261 82573.4 Seg0000 110280.4453 0.2922 -5.5000 51.0000 56.5000 2 1 1138 764.8 Seg0001 941.0988 0.1572 0.2675 1.4203 1.1527 How can mean=941.0988 when the max=1.4203 ??? Regards -- Shahin Nasr PhD in Cognitive Neuroscience Martinos Imaging Center, MGH Harvard Medical School

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Interaction effects in QDEC
by Heidi Foo 26 Apr '17

26 Apr '17

Hi all, I was wondering how I could test for interaction effects between a categorical variable and a continuous variable using QDEC. Is there a way to do so? Thank you. Best Regards, Heidi Foo

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Freesurfer February 2017