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Enh/fmrs tools improvements

William Clarke requested to merge wclarke/fsl_mrs:enh/fmrs_model_improvements into master
  • Add model performance outputs to dynamic fitting.
  • Refined parameter-derived linewidth estimates of (default) voigt model. Previously the width of the Gaussian component was overestimated (by 50%), this did not affect per-metabolite QC measurement of FWHM reported in the main HTML remport and results CSV.
  • fMRS contrasts formed from individual betas (e.g. using fmrs_stats) now operate over all parameter classes, not just concentrations (i.e. sigma, gamma, eps, baseline, phase, and concentrations).
  • fmrs_stats can now be used to express metabolite concentrations as ratios to another contrast (e.g. for scaling to another metabolite, for example tCr).
  • Added better help and error text for fsl_dyn_mrs.

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