Fig. 10.

(a) The fractional change of the decay time $\mathrm{\Delta }{\tau }_c/{\tau }_c$ as a function of the time delay $t_d$ with respect to the onset of vessel wall dilation for global and local neuronal activations. (b) The number of channels $N_c$ required to reach a $\mathrm{CNR}\sim 1$ for the noise level specified as in Fig. 4. The parameters that we utilized are $T_b=1\mu \mathrm{s}$, $T=10\mathrm{ms}$, $\beta =1$, $⟨n⟩=0.1$, and ${\tau }_c=46\mu \mathrm{s}$.