Extracting the three fiber density measures

Hi. This may be discussed somewhere in the forum, but haven’t been able to find it. We would like to extract the first three components of FD, which is often referred to in the literature as FD1, FD2 and FD3, being the fiber density along the primary, secondary and tertiary directions. How are these extracted, simply using fixel2voxel with the split_dir option? This seems to give 15 components with the first three being significantly larger than the rest, but want to make sure that I’m interpreting the output correctly.
Thanks for any advice on this topic!


Mark W.

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Hi Mark, maybe this is the thread you were thinking of?