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Light-tissue interactions. (A) Excitation light (blue), interface reflection (cyan), scattering (green), absorption (black circle with purple cross) and autofluorescence (brown) all contribute to the loss of signal (fluorescence, red) and the gain of noise. (B) Reduced scattering coefficients of different biological tissues as a function of wavelength in the 400-1700 nm region. Adapted with permission from 65. Copyright 2019, Springer Nature.
