Fig. 2.

Percent mean RSS error between known $\mathrm{\Delta }\mathrm{HbO}$ and $\mathrm{\Delta }\mathrm{HbR}$ and the solutions computed using EKF for nine evaluated levels of ${\sigma }_{\mathrm{\Delta }\mathrm{DPF},Q}^2$. The minimum RSS error corresponds to a process noise variance of $1\times {10}^{-6}$.