[Freesurfer] Open Ph.D. position

2021-01-14 Thread Rosalia Dacosta Aguayo
External Email - Use Caution The Institut d’Investigació en Atenció Primària Jordi Gol i Gurina is looking to cover *a Ph.D. position *for the Grenssap Group (led by Dra. Concepció Violán). This is a multidisciplinary team formed by medical doctors, nurses, statisticians,

Re: [Freesurfer] 3D reconstruction of brain MRI

2021-01-14 Thread Fischl, Bruce
Hi Fleur FreeSurfer provides tools that take an approximately isotropic T1-weighted input volume with voxel dimensions around .7-1.5mm and reconstructs models of most macroscopically visible structures. There are other algorithms around that take a set of orthogonal anisotropic acquisitions

[Freesurfer] 3D reconstruction of brain MRI

2021-01-14 Thread Fleur GAUDFERNAU
External Email - Use Caution Dear all, I have just started using Freesurfer. I have an issue when trying to perform volumetric reconstruction from MRI files. Sorry if my question is naive. Data description: for each subject, 3 DICOM folders, each one containing 2D MRI slices

Re: [Freesurfer] almost empty mask.mgh with glmfit

2021-01-14 Thread Julie Ottoy
External Email - Use Caution Hi Doug, thank you for your reply! When I look at my surface-projected non-pvc data per subject, initially it seemed as there were a lot of values zero, but when I go to configure > and replace the threshold to 0, the whole surface is covered with

Re: [Freesurfer] Qdec crash while analysis almost finished

2021-01-14 Thread Greve, Douglas N.,Ph.D.
I'm not sure I understand. Are you using v6 qdec with a 5.3 license file? On 1/13/2021 2:54 AM, chenb...@mail.sysu.edu.cn wrote: External Email - Use Caution Hi, dear Freesurfer experts, I recently came across an invalid Freesurfer license key error

Re: [Freesurfer] Segmentation Fault During mri_convert running FS 5.0

2021-01-14 Thread Greve, Douglas N.,Ph.D.
Sorry, I have no idea what could be wrong. Version 5.0 was 10 years ago:). You can try copying the v5.3 mri_convert into v5.0, but I suspect that the error will crop up in other places. The other thing you can try is to convert the file with 5.3 and then see if 5.0 runs on that file On

Re: [Freesurfer] matrix is ill-conditioned or badly scaled

2021-01-14 Thread Greve, Douglas N.,Ph.D.
NaN will not work for this. You can't do incomplete designs with an FSGD. You can create your own design matrix and pass it with --X, otherwise you'll have to exclude those subjects or put some reasonable (eg, imputed) value On 1/12/2021 6:35 PM, Julie Ottoy wrote: External Email - Use

Re: [Freesurfer] almost empty mask.mgh with glmfit

2021-01-14 Thread Greve, Douglas N.,Ph.D.
A 0 value usually indicates a bad or uninterpretable voxel which you would not want to include in your analysis. You can, of course, by not pruning. But I think you need to answer the question as to why the values are 0. Is 0 interpretable in this case? On 1/11/2021 6:15 PM, Julie Ottoy wrote: