Fig. 3.

Quantitative analysis of multispectral optoacoustic mesoscopic images of forearm during venous and arterial occlusion challenges. Plots of (A) Hb, (B) HbO₂, (C) HbT optoacoustic signals and (D) rsO₂ values for the subjects (n = 6) over the occlusion challenges period (mean ± SEM). Time points (i) to (iv) corresponds to venous occlusion challenge with time point (iv) representing release of the occlusion. Time points (iv) to (vii) correspond to arterial occlusion challenge with time point (vii) representing release of the occlusion.