Fig. 7.

Correlation accuracy plot. Soma compartment signal fraction f_is, soma apparent size r_s and axial intra-neurite diffusivity D_in estimated using relation Eq. (10) without the extra-cellular compartment and GPD approximation and labelled with the superscript “estimated” are plotted against the ground truth values labelled with the superscript “ground-truth”. The perfect positive correlation line (solid line) and ±10% error (dashed lines) are plotted. In infinite SNR case, the correlation is very high (R² ​> ​0.98) and bias within 10%. In the more realistic scenario of SNR ​= ​50 the correlation is still very high (R² ​> ​0.85) and accuracy and precision are close to the ideal case of infinite SNR. In the worse-case scenario of SNR ​= ​10, the correlation is still high (R² ​> ​0.75) and accuracy and precision acceptable. Error bars on data points indicate the statistical dispersion (standard deviation) in model parameter estimation as evaluated by Monte Carlo approach (2500 random drawn).