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Note that the diffusion directions as stored in the DICOM will not be rotated for oblique acquisitions.

cheers,
-MH

-- 
Michael Harms, Ph.D.
-----------------------------------------------------------
Conte Center for the Neuroscience of Mental Disorders
Washington University School of Medicine
Department of Psychiatry, Box 8134
660 South Euclid Ave. Tel: 314-747-6173
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From: Mahmoud <[log in to unmask]>
Reply-To: FSL - FMRIB's Software Library <[log in to unmask]>
Date: Wednesday, May 7, 2014 5:25 PM
To: FSL - FMRIB's Software Library <[log in to unmask]>
Subject: Re: [FSL] Siemens Diffusion Data

Hamid,

I know that if you convert your DICOM data to NifTI with dicm2nii software it gives you both bvalues and bvectors which are needed for DTI processing by software like FSL.
If you still need to know the gradient vector from DICOM header, it is stored as below:

(0019, 100e) DiffusionGradinetDirection
(0019, 100c) B_value

Mahmoud


On Wed, May 7, 2014 at 5:54 PM, Hamied Haroon <[log in to unmask]> wrote:

Hello,

 

I have diffusion data from a Siemens 1.5 T in DICOM format. Does anyone know which DICOM fields/tags will give me the correct diffusion gradient directions to process the data for tractography purposes, please? Would these directions need to be reoriented with respect to the angulation of the imaging plane?

 

If anyone could please help I would be very grateful.

 

Many thanks in anticipation.

 

Best wishes,

 

Hamied

 

 

Hamied A Haroon, PhD | Research Associate in MR Imaging

Centre for Imaging Sciences | Institute of Population Health | Faculty of Medical and Human Sciences | The University of Manchester

Room G.605 | Stopford Building | Oxford Road | Manchester M13 9PT | T: 0161 275 5154 | F: 0161 275 5145 | M: 07961 488 472

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