Figure 4.

Illustration of estimated dMRI indices of the three synthetic DTDs in Fig. 1 using the diffusion encoding sequences shown in Fig. 2 with different levels of measurement noise. The horizontal axis of these plots illustrates the inverse signal-to-noise ratio (1/SNR). The upper and lower boundary of the red and blue shaded areas in (a)–(c) illustrate the 25% and 75% percentiles of the 5000 sampled values of $\mathrm{\mu }{\text{FA}}_{\mathrm{fast}}$ and $\mathrm{\mu }{\text{FA}}_{\mathrm{slow}}$ of the three synthetic structures, respectively. The red and blue solid lines show the median values of the sampled of $\mathrm{\mu }{\text{FA}}_{\mathrm{fast}}$ and $\mathrm{\mu }{\text{FA}}_{\mathrm{slow}}$ values with the underlying true values indicated by the dashed lines. Similarly, the shaded plots in (d)–(f) illustrate the 25% and 75% percentiles of the sampled $\mathrm{\mu }\text{SK}$ values with the median and true values shown by the solid and dashed lines.