Table 1.

List of key notations.

Parameter	Definition
SBR	Signal-to-background ratio. Calculated by Eq. (1)
$S_{\mathrm{bg}}$	Signal from the object of study without ICG (human skin or Lipofundin solution without ICG). Measured experimentally
$S_r$	Signal from the object of study with ICG (Lipofundin solution with ICG). Measured experimentally
$S_f$	Fluorescent signal caused by the presence of ICG in the object of study. Calculated from experimental data for Lipofundin solution or simulated by MC for biological tissue.
$S_{\mathrm{af}}$	Autofluorescent signal from the object of study (human skin or Lipofundin). Calculated by Eq. (4)
$S_{f0}$	Fluorescent signal from Lipofundin solution with the basic ICG concentration (${\mu }_{a0}=0.02{\mathrm{cm}}^{-1}$, ${\mu }_{s0}^{\prime }=20{\mathrm{cm}}^{-1}$, $n_0=6.5\times {10}^{-10}\mathrm{M}$). Calculated from experimental
$S_{\mathrm{sc}}$	Backscattered signal from the object of study (human skin or Lipofundin). Calculated by Eq. (3)
$\frac{R_d}{R_d^{\mathrm{PTFE}}}$	The ratio of the diffuse reflectance coefficients for the object of study and PTFE measured in the absence of emission filters. Measured experimentally
$S_{\mathrm{bg}}^{\mathrm{PTFE}}$	Signal $S_{\mathrm{bg}}$ from PTFE. Measured experimentally