Hi Alan - Yes, you can give a single file for all data sets if they're all acquired with the same gradient table and slice prescription. As a test, you can extract the gradient tables from a couple of your data set's dicom headers and see how different they are. If there are only very small differences, using a single table for all will not make a difference.
Hope this helps,
a.y
On Fri, 5 Feb 2016, Alan Francis wrote:
Thanks Anastasia - that was very helpful. I have another question : I am working on a DTI dataset of around 70 subjects. This
dataset has ostensibly only 1 set of BVECS/BVALS. Can this set be 'generically' used for all the images, given that they have been
acquired on the same scanner?
thanks,
Alan
On Wed, Feb 3, 2016 at 4:17 PM, Anastasia Yendiki <ayendiki@nmr.mgh.harvard.edu> wrote:
Hi Alan - A nifti file with the gradient tables and b-values embedded? All freesurfer programs can handle nifti
volumes, compressed (.nii.gz) or not (.nii). You can pass those volumes to TRACULA, and pass the gradient table and
b-value table as separate files.
Run "mri_convert --help" to see all image file formats that we can handle.
Hope this helps,
a.y
On Wed, 3 Feb 2016, Alan Francis wrote:
Hi Anastasia:
I am working on a set of DTI data that were obtained at the Martinos center. The data is in a single
nii.gz file. The BVECS and
BVALS files are also embedded in this. Could you please advice me how do I code this in the DMRIRC file?
Should I convert the nii.gz file into Analyze to get at the BVECS/ BVALS?
thank you so much,
best regards,
Alan
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Alan N. Francis PhD
NIDA T32 Fellow in Computational Neuroscience
Brain Imaging Center
McLean Hospital
Harvard Medical School
115 Mill Street, Belmont, MA 02478
alanf@bwh.harvard.edu
afrancis@mclean.harvard.edu
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Alan N. Francis PhD
NIDA T32 Fellow in Computational Neuroscience
Brain Imaging Center
McLean Hospital
Harvard Medical School
115 Mill Street, Belmont, MA 02478
alanf@bwh.harvard.edu
afrancis@mclean.harvard.edu
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