Figure 3.

Histograms of the dMRI signal magnitude obtained from three representative voxels, together with fits to a Rician distribution. Fitting a Rician curve to the raw signal leads to a more precise estimate of the ideal signal, while also correcting for bias due to the use of magnitude data. Since N_M = 16 measurements were obtained for each set of imaging parameters, we expect the effective SNR for the signal estimated from the fit to be about $\sqrt{16}=4$ times higher than the SNR of the raw signal.