Re: [Freesurfer] BVECS and BVALS file

Hi Alan - If you're using a standard MGH diffusion sequence and you have a Martinos account, look for the appropriate gradient table in this directory: $FREESURFER_HOME/diffusion/mgh-dti-seqpack/

You'll have to find out how many gradient directions are in your data (that's the number of frames in your nifti file, minus the number of frames that are b=0 images), and then get the corresponding file from the directory above.

Hope this helps, a.y

On Mon, 17 Feb 2014, Alan Francis wrote:

Hi Anastasia:

Yes I am using a standard MGH diffusion sequence.

thanks,

Alan

On Fri, Feb 14, 2014 at 10:20 PM, Anastasia Yendiki ayendiki@nmr.mgh.harvard.edu wrote:

  Hi Alan - The gradient table is not saved in the nifti header.
  Are you using a standard MGH diffusion sequence?

  a.y

  On Fri, 14 Feb 2014, Alan Francis wrote:

        Hi Anastasia:
        Hope all is well. I have DTI data for 65 brains.
        They are in nifti format.
        However, they do not have the bvecs and bvals
        information. I searched the
        web but they only have the conversion information
        for dicom files. 

        I opened the header on MRICRON but how does one
         convert these values into
        table form.

        thanks so much,

        Alan

        Martinos Center.

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