Diagnose tensor orientation problems
Sometimes when working with Diffusion MRI data, our DWIs come to us flipped or in a different coordinate system than the b-vectors. This issue manifests itself in orientation problems with the fit tensors, which can be very subtle and hard to detect.
Manual Diagnosis
Automatic Diagnosis
Automatic diagnosis is beyond our grasp at the moment but in principle it's not impossible, given certain assumptions about the structure that generated the data (that is, that it's a brain).