AFNI Message Board

Dear AFNI users-

We are very pleased to announce that the new AFNI Message Board framework is up! Please join us at:

https://discuss.afni.nimh.nih.gov

Existing user accounts have been migrated, so returning users can login by requesting a password reset. New users can create accounts, as well, through a standard account creation process. Please note that these setup emails might initially go to spam folders (esp. for NIH users!), so please check those locations in the beginning.

The current Message Board discussion threads have been migrated to the new framework. The current Message Board will remain visible, but read-only, for a little while.

Sincerely, AFNI HQ

History of AFNI updates  

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Wolfgang
June 14, 2006 07:11AM
OK, here's what I currently use for that:

3dWarpDrive warps the EPI dataset spatially, and can save the rotation parameters in a 1D file.
I use the rotation angles in that 1D file to be entered in my transformation equation (see basic math how to rotate vectors, you'll have a bunch of sin and cos functios).
With 3dcalc I then calculate the rotated tensor gradient basis (note 3dcalc doesn't like only 1D files as input, so I faked it by using a small dummy 3D brik as the first input, which will never be used in the calculation).
Using this rotated gradient file in 3dDWItoDT gets me the appropriate tensor directions in the result.

Greetings from HBM,
Wolfgang
Subject Author Posted

Rotating gradient vectors for Diffusion Tensors

Sally Durgerian June 07, 2006 05:37PM

Re: Rotating gradient vectors for Diffusion Tensors

RWCox June 08, 2006 05:51AM

Re: Rotating gradient vectors for Diffusion Tensors

Sally Durgerian June 08, 2006 11:17AM

Re: Rotating gradient vectors for Diffusion Tensors

Daniel Glen June 09, 2006 11:52AM

Re: Rotating gradient vectors for Diffusion Tensors

Wolfgang June 14, 2006 07:11AM

Re: Rotating gradient vectors for Diffusion Tensors

tony August 02, 2006 01:55PM

Re: Rotating gradient vectors for Diffusion Tensors

Daniel Glen September 01, 2006 05:11PM

Re: Rotating gradient vectors for Diffusion Tensors

Wolfgang August 12, 2008 12:31PM

Re: Rotating gradient vectors for Diffusion Tensors

Megan February 11, 2009 07:11PM

Re: Rotating gradient vectors for Diffusion Tensors

Daniel Glen September 01, 2006 05:20PM

Re: Rotating gradient vectors for Diffusion Tensors

_durai_ June 19, 2014 12:00PM

Re: Rotating gradient vectors for Diffusion Tensors

Daniel Glen June 20, 2014 04:12PM

Re: Rotating gradient vectors for Diffusion Tensors

Lin October 28, 2011 08:54PM

Re: Rotating gradient vectors for Diffusion Tensors

Daniel Glen October 28, 2011 10:19PM

Re: Rotating gradient vectors for Diffusion Tensors

Lin October 28, 2011 11:28PM

Re: Rotating gradient vectors for Diffusion Tensors

Daniel Glen October 31, 2011 09:08AM