Several methods
have been used to represent the diffusion signal, and recently novel
multi-shell approaches like SHORE, have allowed analytical and continuous
reconstruction of the diffusion propagator. In this study, we propose two new
metrics to better characterize the propagator at different displacement radii,
the Angular Complexity Index (ACI), as a measure of propagator anisotropy, and
the Fractional Displacement Probability (FDP), as index of relative mean
displacement probability within fixed displacement bands. Furthermore, we
display preliminary results that suggest sensitivity to microstructural
organisation at different displacement scales, as opposed to traditional
propagator metrics that reduce it to single scalar maps.
