Fig. 1. (a) Schematic diagram of the interaction between light and tissue caused by the excitation light. (b) Absorption spectra of the main endogenous chromophores: oxyhemoglobin, red line; deoxyhemoglobin, green line; water, blue line; lipids, yellow lines; melanin, brown line; and collagen, black line. Adapted from ref. 22. Copyright© 2019 Springer Link. (c) Schematic diagram of photoacoustic signal generation.
