Fig. 3
From: Contrast agents for photoacoustic imaging: a review of stem cell tracking
a ICG as an exogenous contrast agent for in vivo stem cell tracking in MSOT. b Representative OA monitoring of the cell engraftment over days (excitation wavelength: 810 nm) after spectral unmixing of signal in the right hindlimb. The free ICG-related signal is displayed in purple, intracellular ICG in green. ROIs were drawn on the muscular region (internal area of the hindlimb), excluding the unspecific signal generated by the skin-induced reflection artefacts (tissue depth \(\le\) 1 mm).Adapted with permission from [31].Copyright \(\copyright\) 2018, John Wiley and Sons