afni.nimh.nih.gov

I have a feeling this has been asked countless times before

I have an oblique dataset
my gradient directions are relative to the magnet.

I want to rotate my gradients to be relative to my image.

I have a feeling that it should be just multiplying some rotation matrix by the gradients, but i've tried IJK_DICOM_TO_REAL and the resultant directoins are no longer normalized. Plus, i'm uncertain that the rotation in this matrix is about the origin.

Thoughts?

Thanks
Drew