Re: [Freesurfer] white-gray contrast algorithm

wrote: > why don't you use the gray/white contrast map that freesurfer produces? > > > On 04/02/2012 04:24 PM, John Fredy wrote: > >> Dear Douglas and David, >> >> I am trying to know the gray-white contrast in images from epileptic >> patients. In know th

Re: [Freesurfer] white-gray contrast algorithm

31 PM, Bruce Fischl wrote: > Hi John > > we can provide that for you if you download and install FreeSurfer, then > run recon-all on your data. We also provide tools for computing gray/white > contrast once recon-all has been run. > > cheers > Bruce > > On Sat, 31 Mar

[Freesurfer] white-gray contrast algorithm

Hello all, I am looking for a white-gray matter contrast algorithm I see the publication: Individual Differences in Verbal Abilities Associated with Regional Blurring of the Left Gray and White Matter Boundary http://www.ncbi.nlm.nih.gov/pubmed/22031871 But,how I can obtain the coordinates of th

[Freesurfer] dt_recon with siemens skyra data

Hello all, I am trying to process siemen dti data from a skyra model in the dt_recon software. But the software fails in the conversion from Dicom. Anyone had experience with the DTI sequence from a skyra model? Any suggestion is welcome Thanks in advance John Ochoa Bioingeniería Universidad de

Re: [Freesurfer] problems with dti data in magnetom skyra 3T

ad de Antioquia On Wed, Feb 22, 2012 at 1:36 PM, Douglas N Greve wrote: > It sounds like something went wrong with the conversion to nifti. Do you > use image compression? Are you sure that the series is the correct one? > doug > > John Fredy wrote: > >> Hello all, >> >

[Freesurfer] problems with dti data in magnetom skyra 3T

Hello all, I am trying to use a set of dti data from a Magnetom Skyra 3T. I use the dt_recon process with data from another siemens of 1.5T without problems. With the Skyra 3T I have the following error in the log file: MRIresample(): error inverting matrix; determinant is nan, matrix is: Can so

[Freesurfer] qdec analysis different scanner

Hello all, In voxel based morphometry is not recommended use images from different scanners. This recommendation also apply in the qdec analysis? Thanks in advance John Ochoa Universidad de Antioquia Instituto Neurológico de Antioquia ___ Freesurfer ma

Re: [Freesurfer] install tracula

Thanks, I will wait the 5.1 release John Ochoa On Fri, Apr 15, 2011 at 5:29 PM, Allison Stevens < astev...@nmr.mgh.harvard.edu> wrote: > John, > Tracula is available in the soon to be released 5.1 but not in 5.1. > Allison > > > On Fri, 15 Apr 2011, John Fredy wrote: &

[Freesurfer] install tracula

Hello all I am doing the tutorial about tracula ( http://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/Tracula), but I can`t find the trac-all command in my system. I was running freesurfer 4.5, and now I am running freesurfer 5, but I can´t see the executable in any folder Thanks in advance John

[Freesurfer] Using qdec

Hello All, We are using qdec for the analysis of relation between thickness, two roi: par Opercularis, par triangularis; two test: fmri broca and edinburgo. When I make a design with thickness, one roi and one test in Qdec appears one question like: Does the correlation between X and Y, accountin

[Freesurfer] Correcting subcortical segmentation

Hello all, I'm trying to obtain a set of statistics of subcortical segmentation from a pacient with Huntington's disease. The tutorial of freesurfer shows six possible case of error in freesurfer: correcting white/gray surfaces, topological errors, skull removing, talairach transformation, among o