Figure 1.

(online color at: www.lpr-journal.org) Optical contrast in living tissue. The three major absorbers of light in tissue are oxy- and deoxy-hemoglobin (HbO₂ and HbR) and melanin (shown on log scale, from [6] and [7]). Reduced scattering coefficient (linear right-hand axis) is estimated as ${\mu }_s^{\prime }=A{\lambda }^{-b}$ where A = 1.14 × 10⁻⁸ and b = 1.3 for tissue [8].