Dear NITRC
I have the same problem of Andres. I need to know what kind of DTI directional map is follow in your DTI images to test a lot of tensor metrics.
DTI_modified image is a stack of 3D images and the header doesn't explain how directions Dxx, Dyx, Dyy, Dzx, Dzy, and Dzz are mapped from lowest,rispect to the origin, to hightest volume .
Could you explain me better about your standard?

Thanks a lot
Flavio
University of Verona,Italy