Fig. 3.

Depth analysis and pixel statistics of human data. (a) SNR in dB with increasing depth in human MSOT images at 930 nm. Each box represents the SNR for the SAT or liver segments at the noted depth for all corresponding subjects. The depths (in cm) refer to the centroid of each SAT or liver segment. (b) Density curves (histogram) for the measured optoacoustic signals at 930 nm for all pixels inside the liver ROIs of all subjects. The dashed line represents the selected threshold. (c) Proportion of pixels with optoacoustic signal above the threshold for each of the two groups (healthy volunteers vs. patients with liver steatosis, p-value < 0.001).