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 <ayend...@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. The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
_______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.