Fig. 7.

Correlations between $L*$ (measured with colorimeter) and ${\mu }_a$ (measured with SFDI) for the palm and ventral forearm. The best-fit line to each set of data points is shown in black. For the ventral forearm, where patients with dark skin have high pigmentation, there is a very strong correlation between $L*$ and measured ${{\mu }_s}^{\prime }$ at 471, 659 and 851 nm. For the palm, which has less pigmentation, the correlation is weaker ($\left|R\right|<0.56$).