Two Approaches to Estimate the Depth of Light Penetration into Biotissues

The depth to which light effectively penetrates biological tissues is still a matter of debate in photomedicine. The work compares two approaches to evaluate the depth, based, respectively, on the exponential decay, and on the estimation of a volume, where 95% of absorbed light is accumulated. It is shown that the approach, which uses the conventional exponential decay, underestimates the penetration depth in more than 2 times.