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I will add some helper functions to make the calculations of your scalars more easy.
Briefly, odi and beta_fraction are just optimization parameters that stand in for the actual kappa and beta of the bingham:
you can go from odi to kappa using the function dmipy.distributions.distibrutions.odi2kappa
you can go from beta_fraction to beta by beta = beta_fraction * kappa
from there you can calculate your scalars using that kappa and beta.
Keep in mind that any derived scalar like the ones you want to calculate are just different ways of looking at the same beta and kappa.
They add only microstructure interpretation if the fitted model was good for the underlying tissue, e.g. if you fit noddi-bingham to anything that has multiple bundles these values are hard to interpret and just reflect some signal fit.
issue copied from email from Faye McKenna.
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