[Neuroimaging] [dipy] Import csd model precomputed by mrtrix

[Bago]

Hi Paolo,
  mrtrix and dipy define the SH basis slightly differently, so the
precomputed FOD values need to be adjusted if you want to skip the fit step
and initialize the Fit object directly. IRC we don't currently have the
code to do that, but it would be something we'd like to incorporate.

I have a WIP version of the multi-shell CSD model on a separate branch, I
plan on merging it but wasn't intending to get to that for a few months. If
you'd like to look at before then I can push the branch up to github.

Bago

On Wed, May 25, 2016 at 2:31 AM Paolo Avesani <avesani at fbk.eu> wrote:

> I would like to take advantage of the "predict" method of reconstruction
> models in dipy. The goal is to assess the quality of results.
>
> I have already computed the reconstruction models using mrtrix3 and stored
> the ODF files. For this reason I would need to initialize the csd model by
> importing the data from ODF stored by mrtrix3.
>
> The questions are manifold:
> - may I initialize the csd model by providing the precomputed values and
> skipping the "fit" step?
> - may I import the value of precomputed model from a file stored by
> mrtrix3?
> - is the csd model in dipy compliant with the output of multi-shell csd
> model computed by mrtrix3?
>
> I hope my questions and my goal is formulated clearly.
> Thanks for your support.
> Paolo
>
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