[Freesurfer] TRACULA niftii file

2012-05-10 Thread Gabor Perlaki
Dear all, Is TRACULA able to handle 4D FSL niftii as input for DTI images? Are bves/bvalues extracted by dcm2nii and MRICro accurate for TRACULA? I think TRACULA needs the bvecs in the image coordinate system, which is not the same as scanner coordinate system in case of oblique acquisition. Do I

Re: [Freesurfer] TRACULA niftii file

2012-05-10 Thread Anastasia Yendiki
Hi Gabor - The input DWIs can be in any format that can be read by mri_convert, including the NIfTI format. The gradient directions should be in voxel coordinates, like the ones used by FSL. I don't have experience with dcm2nii, but if you have original DICOM files, you can pass those as the

Re: [Freesurfer] TRACULA niftii file

2012-05-10 Thread Gabor Perlaki
Dear Anastasia, I've the original DICOM files, but it is acquired with the standard Siemens DTI ep2_diff, and not with the MGH-DTI sequence. Is DTI images acquired with the standard DTI accurate and TRACULA able to extract the bvals and bvecs from the dicom files? Thanks, Gabor 2012/5/10

Re: [Freesurfer] TRACULA niftii file

2012-05-10 Thread Anastasia Yendiki
You can specify them by setting bvecfile and bvalfile in your configuration file. On Thu, 10 May 2012, Gabor Perlaki wrote: Dear Anastasia, I've the original DICOM files, but it is acquired with the standard Siemens DTI ep2_diff, and not with the MGH-DTI sequence. Is DTI images acquired

Re: [Freesurfer] TRACULA niftii file

2012-05-10 Thread Michael Harms
Hi Gabor, dcm2nii's default setting for VB17 DICOMs should be to rotate the bvecs that it returns into the voxel/image axes if you have a modern version of it. See item 8 under Sample Datasets of http://www.mccauslandcenter.sc.edu/mricro/mricron/dcm2nii.html for some notes on this issue and a