Potential diffusion metric: average/max deviation from nominal b-vector
oesteban opened this issue · comments
Some head-motion metrics from fMRI can be directly applied (e.g., framewise displacement), but in the case of dMRI I think it would be interesting to have a metric reporting the differences between the b-vectors before b-matrix rotation (with head-motion realignment matrices) and the original (nominal) b-vectors.
The rationale behind this metric is that some large head motions do not affect the b-vector (translations), while FD and other head motion metrics are more volume-to-volume absolute measurements.
Another +1 for this is the ease of computation (once you've estimated head motion, of course).
cc/ @arokem
Okay, I just realized this is duplicate of #1216. I'll move the conversation there.