Anyone know what "siftweights_ifod2.csv" might be?

1

In the output of one of the reconstruction workflows for qsiprep (this one: https://qsiprep.readthedocs.io/en/latest/reconstruction.html#mrtrix-multishell-msmt) I see files called
...space-T1w_desc-preproc_space-T1w_desc-siftweights_ifod2.csv
for each subject/run

(the ... in the name above takes the place of the prefixes of the file name describing subjects/runs)

anyone know what data this csv contains? from some manual inspection it seems like it only contains real numbers between 0 and 2, however the files are around 125MB so whatever I have read through is probably a small fraction of the entire file

2

I think this code calleds the tckgen cmd from MRtrix3 (you can see at here: tckgen — MRtrix 3.0 documentation). The ifod2 is the Second-order Integration over Fiber Orientation Distributions.