Multi tissue tortuosity

[matteofrigo]

The multi-tissue correction is triggered as follows:

    model.set_tortuous_parameter(
        lambda_perp_parameter_name,
        lambda_par_parameter_name,
        volume_fraction_intra_parameter_name,
        volume_fraction_extra_parameter_name,
        S0_correction=True
    )

where the trigger is the S0_correction=True. The used S0 is the one passed to the constructor of the model.

Limitations

The stick and the zeppelin must both be at the top level of the model.

Example of admissible model:

ball = gaussian_models.G1Ball()
stick = SD1WatsonDistributed([cylinder_models.C1Stick()])
zeppelin = SD1WatsonDistributed([gaussian_models.G2Zeppelin()])
model = MultiCompartmentModel(models=[stick, zeppelin, ball], S0_tissue_responses=[s0_stick, s0_zeppelin, s0_ball])

This PR replaces #84 .

[codecov-io]

Codecov Report

Merging #110 (86a0a44) into master (21c3efc) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #110   +/-   ##
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  Coverage   82.86%   82.86%           
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  Files          67       67           
  Lines        5871     5871           
  Branches      696      696           
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  Hits         4865     4865           
  Misses        817      817           
  Partials      189      189           

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[coveralls]

Pull Request Test Coverage Report for Build 727

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 84.105%

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Totals
Change from base Build 726:	0.0%
Covered Lines:	5054
Relevant Lines:	5871

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💛 - Coveralls