Hi!
So, if somebody finds this useful:
Since SS3T-CSD is not currently implemented in MrTrix, I went ahead and wrote a small variant of it that seems to work quite well in simulating T1 contrast from DWI.
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Following Wm ODF and response function with dhollander option _ single shell versus multi shell , I estimate response functions for CSF and WM only (I’m working on bad bad single-shell 30 gradient direction data)
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I do linear registration between tissue probability maps max(P_csf, P_wm) (from the T1) and max(FA, ADC) (from DWI) (I forgot where but I think this was recommended somewhere on this forum as well=
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Using that alignment, I follow Distortion correction using T1 to compute a linear mapping between [WM GM CSF] probabilities and T1 intensities - using the FA map instead of the GM response.
This seems to work quite well : left the b0, right the ‘simulated’ T1, both overlaid with the non-lineary registered T1 in red:
