Re: [Freesurfer] bias correction on 7T MEMPRAGE

2020-02-20 Thread falk.luesebr...@med.ovgu.de
External Email - Use Caution Dear Vale, using the GUI of SPM you cannot get a FWHM of lower than 30. You have to save the batch to disk, load it in MATLAB and change the parameters to your liking. In case this sounds too complicated, you can use part of a reconstruction pipelin

Re: [Freesurfer] how to perform No Partial Volume Correction for PET using PETSURFER

2020-02-20 Thread Kate Marvel
External Email - Use Caution Sorry for that. psf is zero. Thank you very much Douglas. Kate On Thu, Feb 20, 2020 at 3:55 PM Douglas N. Greve wrote: > yes, they are, thought I don't know why you include "psf6" in the output > folder. > > On 2/20/2020 3:36 PM, Kate Marvel wrote:

Re: [Freesurfer] correlation analysis

2020-02-20 Thread Douglas N. Greve
Yes, though I might demean all the covariates. For thickness, you can run mri_glmfit --surf fsaverage lh --y lh.thickness_20.fsavg.mgh --osgm --eres-save --o thickness-demean then use thickness-demean/eres.mgh as the PVR On 2/20/2020 9:13 AM, Raffaele Dubbioso wrote: External Email -

Re: [Freesurfer] Question regarding Qdec vs mri_glmfit

2020-02-20 Thread Douglas N. Greve
Don't use gender as a continuous variable. You need four classes (TLE-Male, TLE-Female, etc) and change the contrast to reflect it, otherwise I think it looks ok. Load the sig.mgh file into freeview (or the tksurferfv freeview wrapper) On 2/19/2020 10:31 PM, 邓刊 wrote: External Emai

Re: [Freesurfer] surfreg function

2020-02-20 Thread Douglas N. Greve
yes, those commands look right, except I think you don't need to specify --surfreg my_avg_subject.sphere.reg It will automatically do this for you On 2/19/2020 1:44 PM, Marina Fernández wrote: External Email - Use Caution Hi experts, I am running the following command to create de ave

Re: [Freesurfer] some basic questions regarding longitudinal analyses in Freesurfer

2020-02-20 Thread Lara Foland-Ross
External Email - Use Caution Hi there, Reposting this message (below). Would appreciate any guidance you can provide. Thanks, Lara From: freesurfer-boun...@nmr.mgh.harvard.edu on behalf of Lara Foland-Ross Sent: Friday, February 7, 2

Re: [Freesurfer] how to perform No Partial Volume Correction for PET using PETSURFER

2020-02-20 Thread Douglas N. Greve
yes, they are, thought I don't know why you include "psf6" in the output folder. On 2/20/2020 3:36 PM, Kate Marvel wrote: External Email - Use Caution Dear All, I would like to perform no partial volume correction of PET  using PETSURFER. The steps followed in doing this is shown b

[Freesurfer] how to perform No Partial Volume Correction for PET using PETSURFER

2020-02-20 Thread Kate Marvel
External Email - Use Caution Dear All, I would like to perform no partial volume correction of PET using PETSURFER. The steps followed in doing this is shown below: gtmseg --s Patient_1 mri_concat Patient_1_pet.nii.gz --mean --o Patient_1_pet_tac_vol_mean.nii.gz mri_coreg --s

Re: [Freesurfer] WM surface on pial surface and pial surface out of brain

2020-02-20 Thread Bruno Pastorello
External Email - Use Caution Hi Bruce, Thanks for the reply. What are the commands should I try? mri_segment brainmask.mgz wm.mgz -wlo 90 and after: recon-all -autorecon2-wm -autorecon3 -subjid ??? The images are scanned in a GE PETMR 3T. MR hardware configurati

Re: [Freesurfer] WM surface on pial surface and pial surface out of brain

2020-02-20 Thread Bruce Fischl
Hi Bruno it looks to me like there is very little gray/white contrast, which is the root of your problem. YOu could try limiting the intensity ranges in the segmentation and surface deformation steps using expert options (e.g. -wlo for mri_segment). We can also help improve the acquisition. If

Re: [Freesurfer] WM surface on pial surface and pial surface out of brain

2020-02-20 Thread nayan wadhwani
External Email - Use Caution Hello, You can follow https://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/TroubleshootingDataV6.0 to correct your defects. Thanks and Regards Nayan Wadhwani On Thu, Feb 20, 2020 at 8:04 PM Bruno Pastorello < bruno.pastore...@hc.fm.usp.br> wrote: >

[Freesurfer] correlation analysis

2020-02-20 Thread Raffaele Dubbioso
External Email - Use Caution Dear FS team, in my analysis I'd like to correlate two variables such as cortical myelination and neurophysiological metrics, regressing-out thickness and age of the subjects. I have only one group. My FSGD file should be: GroupDescriptorFile 1 Title

[Freesurfer] nopvc.nii.gz

2020-02-20 Thread Marina Fernández
External Email - Use Caution Dear Freesurfer experts, I have compared the PVC uptake values of gtm.stats with the values of gtm.nii.gz (that I loaded with the function load_nii in matlab). I realized that the values in matlab are transposed, i. e., the first value in gtm.stats is

Re: [Freesurfer] PetSurfer questions

2020-02-20 Thread Soo-Jong Kim
External Email - Use Caution *Thank you Dr. Greve for your answer* I checked all about your comment. I have questions more. 1. I found that volumes or counts in gtm.stats.dat are for native PET space. If co-registered PET onto corresponding MRI(i.e. MRI space) is available usin