Freesurfer April 2022

freesurfer@nmr.mgh.harvard.edu

97 participants
155 discussions

Unit of the Numbers in cache.th40.neg.y.ocn.dat
by Na, Xiaoxu 17 Feb '24

17 Feb '24

External Email - Use Caution Dear Freesurfer Experts, As I'd like to extract the average value of each subject in the cluster after running group analysis, may I know the unit of these numbers? Since the one I'm running is surface area, and the cluster is 444mm^2, all the numbers in the file cache.th40.neg.y.ocn.dat is in the range of [0.55 1.05], may I know if this is correct and if so, how the unit is for those? Thanks a lot! ClusterNo Max VtxMax Size(mm^2) MNIX MNIY MNIZ CWP CWPLow CWPHi NVtxs WghtVtx 1 -4.8321 40067 444.11 -58.1 -16.6 -23.9 0.0002 0 0.0004 670 -2784.11 Regards, Xiaoxu ---------------------------------------------------------------------- Confidentiality Notice: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply e-mail and destroy all copies of the original message.

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Extract single time frame
by Rockers, Elijah D. 16 Oct '22

16 Oct '22

Hello again, I have a large time series in dicom or .nii format. I am interested in extracting a single time frame from it. I did this before, I believe with freesurfer, but I have somehow forgot the name of the command, and I can't seem to find it. I believe it could be used to specify particular regions of the volume, as well as time. I need the entire volume, still, but only one frame. Thanks in advance! Eli Houston Methodist. Leading Medicine. Ranked by U.S.News & World Report as one of America's "Best Hospitals" in 11 specialties. Named to FORTUNE® Magazine's "100 Best Companies to Work For®" list 10 years in a row. Designated as a Magnet hospital for excellence in nursing. Visit us at houstonmethodist.org. Follow us at twitter.com/MethodistHosp and www.facebook.com/HoustonMethodist. ***CONFIDENTIALITY NOTICE*** This e-mail is the property of Houston Methodist Hospital and/or its relevant affiliates and may contain restricted and privileged material for the sole use of the intended recipient(s). Any review, use, distribution or disclosure by others is strictly prohibited. If you are not the intended recipient (or authorized to receive for the recipient), please contact the sender and delete all copies of the message. Thank you.

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Reliability and sensitivity of two whole-brain segmentation approaches − ASEG and SAMSEG
by Donatas Sederevicius 28 Aug '22

28 Aug '22

External Email - Use Caution A new pre-print paper comparing two FreeSurfer’s whole-brain segmentation methods - ASEG and SAMSEG is now available (see the link below). The study is of great interest to many researchers in the field, providing new insights and guiding the selection of the processing method. https://www.biorxiv.org/content/10.1101/2020.10.13.335737v1

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SAMSEG and statistics
by k3ops＠free.fr 27 Aug '22

27 Aug '22

External Email - Use Caution Hi FreeSurfer community, I recently discovered the SAMSEG application in the FreeSurfer 7.2.0 release and started to give a try on few subjects were FreeSurfer was having a hard time to segment brain structures (due to poor contrast). So I have few questions to harmonize the SAMSEG and FreeSurfer statistical files: 1. "samseg.stats" file is not compliant with the "asegstats2table" application so I was not able to generate a final CSV file with volumetric results Is there another solution? 2. "samseg.stats" file does not provide large brain structures like "BrainSegNotVent" or "SupraTentorialNotVent", is there a way to get them calculated? 3. "samseg.stats" file does not provide left/right or global cortical thickness, is there a command line to execute to get these extra values? Thanks. Best, Florent

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Curvature data question
by Samuel Paré 05 May '22

05 May '22

External Email - Use Caution Hello, We are looking at some of our data acquired on a 7T magnet. We ran recon-all with the “highres” flag. The obtained results for cortical thickness and cortical volume are very comparable to data that we obtain when using 3 T brain images. However, the results for cortical curvature are significantly different from what we get by our 3 T data. I attach the output of mean cortical curvature values using the Destrieux atlas for a 3T and 7T dataset on healthy controls. As you can notice, they differ roughly by a factor of 2. Any explanation for what may cause this large difference? Thanks, Samuel [image: image.png] -- *Samuel Paré, MSc* Laboratoire du développement et plasticité du système visuel École d'optométrie Université de Montréal

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segmentHA_T1, mri_segstats: How can I get the PVC uptake for amygdalar nuclei?
by Tun, Samantha 05 May '22

05 May '22

External Email - Use Caution Hello Freesurfer Devs! I am attempting to extract the tau uptake in the amygdalar segmentations. I ran this command: mri_segstats --seg rh.hippoAmygLabels-T1.v21.FS60.FSvoxelSpace.mgz --i anat_resliced.mgz --sum rHA_stats.dat to try and calculate the tau uptake. I was able to get an output, but I am unsure how to proceed from here. I basically want to get the pvc uptake of the amygdalar and hippocampal subfields scaled to the pons. I don't think I can run the mri_gtmpvc command, so if you had any insight on how to calculate the scaled uptake of tau in the subfields, let me know! Best, Samantha

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"B0 distortion correction with reverse-polarity DWIs"
by Gonzalo Rojas Costa 04 May '22

04 May '22

External Email - Use Caution Hi: I tried to process a tractography with TRACULA. I got the error "ERROR: for B0 distortion correction with reverse-polarity DWIs. ERROR: or for model-based eddy-current distortion correction, ERROR: must specify PE direction". What does it mean? I read the webpage https://secure-web.cisco.com/1guG1MnfZf84DwQHfWaHHLuw6SMY7Z-tutMOyUkvQB8sNK…, but It was not clear to me how to solve the problem. Sincerely, Gonzalo Rojas Costa Department of Radiology Clínica las Condes Lo Fontecilla 441, Las Condes, Santiago, Chile. Tel: 56-2-2105170 Cel: 56-9-97771785 http://secure-web.cisco.com/12GtciP9OUiW5DkspMfrRVy3WsQH7lo4AsKjg0Sj8uml6hm… https://secure-web.cisco.com/1MqLKS1F46RbplHUM6h_KNyjN0BiKcyL58vxd1gCfQMyaz… https://secure-web.cisco.com/1VYyKt8bpinu3O6RicUYTbOJmllqjZD8fa4vMdxnypEQay… https://secure-web.cisco.com/1cDJNj5GQNOJNQJmRBcgfx71cRT_O6MgqP1ftnJlfUY5Nu… http://secure-web.cisco.com/1FaAL_RhtLAORTKofMH0umP03Sz7z4fz1ix6_BxtTBFSkxZ… https://secure-web.cisco.com/1Chz4Nd2Gs4bv5UU_W7XXxgXJhQCBYB_9QHiTrY3XemPxP…

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TRACULA question
by Gonzalo Rojas Costa 04 May '22

04 May '22

External Email - Use Caution Hi: Is it possible to use input diffusion files in MOSAIC IMA Siemens file format directly? Or is it necessary to convert to nifti file format first? Sincerely, Gonzalo Rojas Costa Laboratory for Advanced Medical Image Processing Department of Radiology Clínica las Condes Lo Fontecilla 441, Las Condes, Santiago, Chile. Tel: 56-2-2105170 Cel: 56-9-97771785 https://secure-web.cisco.com/13PUT3U3zuLu0QBvcZiGdm18njGuoQr6dUsSQj9e5H3gOi… https://secure-web.cisco.com/1TdZ-Zm0eaCvN4RyCzzXuq6HNPTVfbbxwGyNTIGMGFiRfy… https://secure-web.cisco.com/1lJu3jBI0nOfv9_IwBeCbcBNGA2K6pj5tSumDqMfk3ZItR… http://secure-web.cisco.com/1vs-E3PvUdSdie9Xm5LpQNiLpowx1KB-bnADkKZ76Vp4VAN… https://secure-web.cisco.com/1FM_I0dgNRRtoYqJmIXPdHgx__9woRyRSo5bnLSxgt51fC…

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meanings of trac-all outputs
by Zeng, Qi 04 May '22

04 May '22

External Email - Use Caution Hi experts, Just want to check if dmri/dwi.nii.gz is the 4D dwi volumes after correction for B0 inhomogeneities, eddy current, and head motion? and dmri/nodif_brain_mask.nii.gz is the 3D ROI mask for the whole brain? and dmri/bvals and dmri/bvecs are rotated bvals and rotated bvecs? Thank you! Best, Qi

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Re: [Freesurfer] Permission denied error from -localGI
by Billah, Tashrif 02 May '22

02 May '22

Thank you Douglas. We took our time to install FreeSurfer 7.2 and retry. However, we ran into the same error: >> reading filled volume... /bin/bash: /scratch/tp44447785365264536.load_mgh.m.mgh: Permission denied ERROR: could not open /scratch/tp44447785365264536.load_mgh.m.mgh for reading ERROR: loading /data/pnl/FS_SUBJECTS_DIR/1001/surf/tmp-mris_compute_lgi-lh.pial/lh.pial.filled.mgz as MGH Struct contents reference from a non-struct array object. Error in make_outer_surface (line 25) volume=vol.vol; >> ERROR: make_outer_surface did not create output file What can we do now? -Tashrif =================== Douglas N. Greve Wed, 27 Apr 2022 07:51:33 -0700 Can you just try it with 7.2? We had some problems at one point with temporary files in lGI that were fixed with 7.2 =================== On 4/27/2022 9:36 AM, Billah, Tashrif wrote: Sorry about missing your earlier question--our FreeSurfer is 7.1.0 We still need your help with this issue. Thank you, Tashrif Douglas N. Greve Sun, 27 Mar 2022 13:57:02 -0700 =================== What version of FS are you running? On 3/20/2022 8:47 PM, Billah, Tashrif wrote: It does not exist and cannot be created in a shared cluster. Is there a way to define a different folder for /scratch/tp24093955057547375.load_mgh.m.mgh? =============== Douglas N. Greve Wed, 09 Mar 2022 10:04:31 -0800 Do you have permission to /scratch? Does it exist? =============== Billah, Tashrif Wed, 02 Mar 2022 06:50:41 -0800 Hi all, We are trying to run recon-all with -localGI but running into an unknown permission denied error: $ recon-all -s sub-1001 -localGI ``` make_outer_surface('/path/to/FS_SUBJECTS_DIR/sub-1001/surf/tmp-mris_compute_lgi-lh.pial/lh.pial.filled.mgz',15,'/path/to/FS_SUBJECTS_DIR/sub-1001/surf/tmp-mris_compute_lgi-lh.pial/lh.pial-outer'); exit ================= < M A T L A B (R) > Copyright 1984-2017 The MathWorks, Inc. R2017a (9.2.0.556344) 64-bit (glnxa64) March 27, 2017 >> reading filled volume... /bin/bash: /scratch/tp24093955057547375.load_mgh.m.mgh: Permission denied ERROR: could not open /scratch/tp24093955057547375.load_mgh.m.mgh for reading ERROR: loading /path/to/FS_SUBJECTS_DIR/sub-1001/surf/tmp-mris_compute_lgi-lh.pial/lh.pial.filled.mgz as MGH Struct contents reference from a non-struct array object. Error in make_outer_surface (line 25) volume=vol.vol; >> ERROR: make_outer_surface did not create output file '/path/to/FS_SUBJECTS_DIR/sub-1001/surf/tmp-mris_compute_lgi-lh.pial/lh.pial-outer'! recon-all -s sub-1001 exited with ERRORS at Wed Mar 2 09:02:21 EST 2022 ``` Our MATLAB environment is properly setup and we regularly run other FreeSurfer-MATLAB commands. So I do not think that is causing the issue. Best, Tashrif

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Freesurfer April 2022