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nipreps / mriqc

Automated Quality Control and visual reports for Quality Assessment of structural (T1w, T2w) and functional MRI of the brain
http://mriqc.readthedocs.io
Apache License 2.0
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Potential diffusion metric: average/max deviation from nominal b-vector #1221

Closed oesteban closed 3 months ago

oesteban commented 3 months ago

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

oesteban commented 3 months ago

Okay, I just realized this is duplicate of #1216. I'll move the conversation there.