Freesurfer December 2023

freesurfer@nmr.mgh.harvard.edu

52 participants
65 discussions

Segmentation error with T2w
by Litsch, Jakob Benjamin 06 Dec '23

06 Dec '23

External Email - Use Caution Dear Freesurfer Team, I am a master student from Berlin and pretty new to preprocessing MRI data, so please bear with me. I am attempting to use Freesurfer as Part of my fMRIprep pipeline to preprocess patient data. When running fmriprep with only the T1w and the BOLD image it works fine. As soon as I put in my T2w image as well recon-all crashes at some point. My patient data has lesions like brain tumors, just in case this could make freesurfer struggle. Starting loop over 250145 vertices vno = 0, t = 5.16114 error: Numerical argument out of domain error: MRIhistogramLabelRegion: constant image error: Numerical argument out of domain error: MRIhistogramLabelRegion: constant image Segmentation fault 1) Freesurfer version: freesurfer-linux-ubuntu22_x86_64-7.3.2-20220804-6354275 2) platform: Windows 11, Ubuntu 22.04.2 LTS (GNU/Linux 5.15.133.1-microsoft-standard-WSL2 x86_64) 3) recon-all log: see attached Looking forward to hear from you, Jakob Litsch

2 1

Saving more than one label in a single volume file
by Aurora Orazi 06 Dec '23

06 Dec '23

External Email - Use Caution Hello Freesurfer Developers, I'm attempting to save more than one label in as a single volume file from the aseg.mgz file obtained with the infant FreeSurfer pipeline. However, given the lack of tutorials I'm finding it difficult to do so. I hope you can help me with this problem. Freesurfer version: freesurfer-linux-ubuntu22_x86_64-7.4.1-20230614-7eb8460 Platform: Ubuntu 22.04 Hoping to hear from you soon, Best regards, Aurora

2 1

Reopen issue 898: mri_binarize --replace misbehavior
by Nick Schmansky 04 Dec '23

04 Dec '23

External Email - Use Caution I have encountered the problem that chrisadamsonmcri<https://secure-web.cisco.com/1xWGWxoOiHrVvr8AONbdJmSDQHTmtv9-28Mk5n8yl42uZZ…> describes in issue 898<https://secure-web.cisco.com/1m61bxpBwgxqKDi9Ogsq79O03id3L1GGsM-889UgjAYymO…>. The last time I used mri_binarize was using FS v6, where it behaves like this: mri_binarize --replace A B --replace B C Label A would become B in the output. Label B would become C in the output. here's an example: --replace 11 15 # map "4th Ventricle" -> "4th-Ventricle"\ --replace 15 72 # map "5th Ventricle" -> "5th-Ventricle"\ i want to convert a seg where the LUT maps 11 as 4th ventricle and 15 as 5th ventricle. i want to convert these to the FS LUT (using the replacements shown, 15 and 72). But this results in 4th ventricle getting labeled as 5th ventricle! Four years ago i ran a script performing 230 replace functions to map Neuromorphometrics labels to FS, and it worked fine (evidenced by Dice testing and inspection). Today i ran the same script on the same data and get funky results on a half dozen or so structures that follow the example replacement scheme. My current workaround is to use mri_binarize from v6. ---------------------------------------------------------------------- The information contained in this message may be privileged and confidential. If you are NOT the intended recipient, please notify the sender immediately with a copy to lfoster(a)radnet.com and destroy this message. Please be aware that e-mail communication can be intercepted in transmission or misdirected. Your use of e-mail to communicate protected health information to us indicates that you acknowledge and accept the possible risks associated with such communication. Please consider communicating any sensitive information by telephone, facsimile or regular U.S. mail. If you do not wish to have your information sent by e-mail, please contact the sender immediately.

4 3

outer_skin.surf
by Diksha Srishyla 04 Dec '23

04 Dec '23

External Email - Use Caution Hello, I am trying to generate the surfaces ‘brain.surf’, ‘inner_skull.surf’, ‘outer_skull.surf’ and ‘outer_skin.surf’. When I use ‘mne watershed bem’, I obtain surfaces that are in the wrong order (eg. brain.surf is outside of the inner_skull.surf’) I viewed previous queries on the archive was able to generate properly ordered ‘brain.surf’ and ‘inner_skull.surf’ by using the following commands: mri_binarize --i brainmask.mgz --min 0.5 --surf brain.surf mris_expand brain.surf 3 inner_skull Are there similar commands I can use to generate ‘outer_skin.surf’ ? From that, I understand I would just need to shrink the surface by 3 mm to get ‘outer_skull.surf’. Thank you for your time. Best, Diksha

1 0

skull stripping error
by yunus soleymani 04 Dec '23

04 Dec '23

External Email - Use Caution Hello Freesurfers, I recently analyzed about 600 subjects from HCP database using the Freesurfer recon-all algorithm. However, I noticed that in almost one third of the subjects, the software did not perform the skull stripping correctly when I checked the results in Freeview. To address this issue, I repeated the skull stripping step for each subject using the code "recon-all -skullstrip -wsthresh 35 -clean-bm -s <subject name>". The skull stripping went well, and then I repeated the analysis using the code "recon-all -autorecon-pial -subjid <subject name>". When I compared the pre and post-correction stats folder, I noticed that some volumetric values had changed, especially in the specific areas related to the initial skull stripping error. However, my concern is that when I loaded the .pial and .aseg files into Freeview, there was no change compared to before the correction visually. Is this okay, or should I take additional steps? I would appreciate your help. Thank you,YunusBellow is an example. NumberS 1 and 2 are brain masks before and after correction. Numbers 2 and 3 are superimposed .aseg files before and after correction.

2 5

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

Freesurfer December 2023